Vladimir M. Agranovich
- Published in print:
- 2008
- Published Online:
- January 2009
- ISBN:
- 9780199234417
- eISBN:
- 9780191715426
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199234417.003.0012
- Subject:
- Physics, Atomic, Laser, and Optical Physics
This chapter discusses the properties of surface excitons and polaritons. It presents a discussion of surface polaritons at the sharp interface between media, the observation of exciton surface ...
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This chapter discusses the properties of surface excitons and polaritons. It presents a discussion of surface polaritons at the sharp interface between media, the observation of exciton surface polaritons at room temperature, the surface excitons in the presence of a transition layer, and nonlinear surface polaritons. The two-dimensional site shift surface excitons in outermost monolayers of molecular crystals and their properties are also considered. It is shown that in quasi-one dimensional crystals with molecules having the strong mixing of Frenkel- and CT exciton states at the edge of even perfect chain exciton states can be formed localized at edge analogous to Tamm states in perfect semiconductors.Less
This chapter discusses the properties of surface excitons and polaritons. It presents a discussion of surface polaritons at the sharp interface between media, the observation of exciton surface polaritons at room temperature, the surface excitons in the presence of a transition layer, and nonlinear surface polaritons. The two-dimensional site shift surface excitons in outermost monolayers of molecular crystals and their properties are also considered. It is shown that in quasi-one dimensional crystals with molecules having the strong mixing of Frenkel- and CT exciton states at the edge of even perfect chain exciton states can be formed localized at edge analogous to Tamm states in perfect semiconductors.
Lawrence Challis (ed.)
- Published in print:
- 2003
- Published Online:
- January 2010
- ISBN:
- 9780198507321
- eISBN:
- 9780191709319
- Item type:
- book
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780198507321.001.0001
- Subject:
- Physics, Atomic, Laser, and Optical Physics
The study of electrons and holes confined to two, one, and even zero dimensions has uncovered a rich variety of new physics and applications. This book describes the interaction between these ...
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The study of electrons and holes confined to two, one, and even zero dimensions has uncovered a rich variety of new physics and applications. This book describes the interaction between these confined carriers and the optic and acoustic phonons within and around the confined regions. Phonons provide the principal channel of energy transfer between the carriers and their surroundings and also the main restriction to their room temperature mobility. However, they also have many other roles; they contribute, for example, an essential feature to the operation of the quantum cascade laser. Since their momenta at relevant energies are well matched to those of electrons, they can also be used to probe electronic properties such as the confinement width of two-dimensional (2-D) electron gases and the dispersion curve of quasiparticles in the fractional quantum Hall effect. The book describes both the physics of the electron-phonon interaction in the different confined systems and the experimental and theoretical techniques that have been used in its investigation. The experimental methods include optical and transport techniques as well as techniques in which phonons are used as the experimental probe. This book provides an up-to-date review of the physics and its significance in device performance.Less
The study of electrons and holes confined to two, one, and even zero dimensions has uncovered a rich variety of new physics and applications. This book describes the interaction between these confined carriers and the optic and acoustic phonons within and around the confined regions. Phonons provide the principal channel of energy transfer between the carriers and their surroundings and also the main restriction to their room temperature mobility. However, they also have many other roles; they contribute, for example, an essential feature to the operation of the quantum cascade laser. Since their momenta at relevant energies are well matched to those of electrons, they can also be used to probe electronic properties such as the confinement width of two-dimensional (2-D) electron gases and the dispersion curve of quasiparticles in the fractional quantum Hall effect. The book describes both the physics of the electron-phonon interaction in the different confined systems and the experimental and theoretical techniques that have been used in its investigation. The experimental methods include optical and transport techniques as well as techniques in which phonons are used as the experimental probe. This book provides an up-to-date review of the physics and its significance in device performance.
R. Zimmermann
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780199238873
- eISBN:
- 9780191716652
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199238873.003.0018
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter deals with Bose-Einstein condensation of excitons. After a historical survey of searching for Bose-Einstein condensation of excitons, the chapter focuses on long-lived indirect excitons ...
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This chapter deals with Bose-Einstein condensation of excitons. After a historical survey of searching for Bose-Einstein condensation of excitons, the chapter focuses on long-lived indirect excitons in coupled quantum wells: Bose-Einstein condensation of noninteracting bosons in a two-dimensional parabolic trap is outlined, and the ground-state wavefunction of indirect excitons is discussed in detail. Recent theoretical results on the concentration-dependent blue shift and broadening of the photoluminescence line associated with indirect excitons are discussed.Less
This chapter deals with Bose-Einstein condensation of excitons. After a historical survey of searching for Bose-Einstein condensation of excitons, the chapter focuses on long-lived indirect excitons in coupled quantum wells: Bose-Einstein condensation of noninteracting bosons in a two-dimensional parabolic trap is outlined, and the ground-state wavefunction of indirect excitons is discussed in detail. Recent theoretical results on the concentration-dependent blue shift and broadening of the photoluminescence line associated with indirect excitons are discussed.
Vladimir Agranovich
- Published in print:
- 2008
- Published Online:
- January 2009
- ISBN:
- 9780199234417
- eISBN:
- 9780191715426
- Item type:
- book
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199234417.001.0001
- Subject:
- Physics, Atomic, Laser, and Optical Physics
This book details the studies of the properties of electronic and vibrational excitations in organic solids. It brings together most of the theory in this field together with many illustrations of ...
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This book details the studies of the properties of electronic and vibrational excitations in organic solids. It brings together most of the theory in this field together with many illustrations of experiments. There is a detailed treatment of many topics in uniform style, and the book also contains discussions of new phenomena. In different chapters, the theory of the Frenkel excitons, charge transfer excitons and polaritons, and their contribution to the optical properties of organic solids (bulk, superlattices, surfaces, nanostructures) will be found. The surface electronic excitations, optical biphonons, and Fermiresonance by polaritons are also discussed. The book presents the theory of hybrid Frenkel-Wannier-Mott excitons in nanostructures, the theory of polaritons in organic microcavities including hybrid microcavities, the new concept for LED, the effects of mixing of Frenkel and charge-transfer excitons, and the theory of excitons, and polaritons in one- and two-dimensional crystals. There are plenty of references to current research and to important historical work.Less
This book details the studies of the properties of electronic and vibrational excitations in organic solids. It brings together most of the theory in this field together with many illustrations of experiments. There is a detailed treatment of many topics in uniform style, and the book also contains discussions of new phenomena. In different chapters, the theory of the Frenkel excitons, charge transfer excitons and polaritons, and their contribution to the optical properties of organic solids (bulk, superlattices, surfaces, nanostructures) will be found. The surface electronic excitations, optical biphonons, and Fermiresonance by polaritons are also discussed. The book presents the theory of hybrid Frenkel-Wannier-Mott excitons in nanostructures, the theory of polaritons in organic microcavities including hybrid microcavities, the new concept for LED, the effects of mixing of Frenkel and charge-transfer excitons, and the theory of excitons, and polaritons in one- and two-dimensional crystals. There are plenty of references to current research and to important historical work.
Vladimir M. Agranovich
- Published in print:
- 2008
- Published Online:
- January 2009
- ISBN:
- 9780199234417
- eISBN:
- 9780191715426
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199234417.003.0003
- Subject:
- Physics, Atomic, Laser, and Optical Physics
This chapter presents a second quantized theory of Frenkel excitons. An energy operator for a molecular crystal in the second quantization is introduced, and excitonic states for crystals with one ...
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This chapter presents a second quantized theory of Frenkel excitons. An energy operator for a molecular crystal in the second quantization is introduced, and excitonic states for crystals with one and more molecules per unit cell are considered. The paulions are introduced in consideration of the two-level molecular model, and exact transformation from paulions to bosons is demonstrated. The mechanism of self-trapping of Frenkel excitons and spectra and transport of self-trapped excitons are discussed. The interaction of excitons and elementary lattice excitations is considered. The results of calculations of exciton states for some molecular crystals (anthracene, naphthalene, tetracene and pentacene) are presented.Less
This chapter presents a second quantized theory of Frenkel excitons. An energy operator for a molecular crystal in the second quantization is introduced, and excitonic states for crystals with one and more molecules per unit cell are considered. The paulions are introduced in consideration of the two-level molecular model, and exact transformation from paulions to bosons is demonstrated. The mechanism of self-trapping of Frenkel excitons and spectra and transport of self-trapped excitons are discussed. The interaction of excitons and elementary lattice excitations is considered. The results of calculations of exciton states for some molecular crystals (anthracene, naphthalene, tetracene and pentacene) are presented.
Alexey V. Kavokin and Jeremy J. Baumberg
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780199228942
- eISBN:
- 9780191711190
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199228942.003.0004
- Subject:
- Physics, Atomic, Laser, and Optical Physics
This chapter starts from the Lorentz oscillator model then discusses the optical transitions in semiconductors. After an introduction of Wannier-Mott and Frenkel excitons, the Hopfield equations are ...
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This chapter starts from the Lorentz oscillator model then discusses the optical transitions in semiconductors. After an introduction of Wannier-Mott and Frenkel excitons, the Hopfield equations are used to describe exciton-polaritons in bulk crystals. The non-local dielectric response theory is used to describe the optical response of semiconductor quantum wells, wires, and dots. Finally, the dispersion of exciton-polaritons in microcavities is derived, and the threshold between weak and strong light-matter coupling regime is discussed.Less
This chapter starts from the Lorentz oscillator model then discusses the optical transitions in semiconductors. After an introduction of Wannier-Mott and Frenkel excitons, the Hopfield equations are used to describe exciton-polaritons in bulk crystals. The non-local dielectric response theory is used to describe the optical response of semiconductor quantum wells, wires, and dots. Finally, the dispersion of exciton-polaritons in microcavities is derived, and the threshold between weak and strong light-matter coupling regime is discussed.
V. B. Timofeev
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780199238873
- eISBN:
- 9780191716652
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199238873.003.0017
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter reviews attempts to realize Bose-Einstein condensation of excitons in bulk semiconductors and semiconductor nanostructures, emphasizing on indirect (interwell) excitons in GaAs/AlGaAs ...
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This chapter reviews attempts to realize Bose-Einstein condensation of excitons in bulk semiconductors and semiconductor nanostructures, emphasizing on indirect (interwell) excitons in GaAs/AlGaAs coupled double quantum wells. Recent experiments with indirect excitons confined in a circular electric-field-induced in-plane trap are discussed. The observed spatially-ordered patterns in the photoluminescence signal and large coherence length are interpreted in terms of Bose-Einstein condensation of indirect excitons.Less
This chapter reviews attempts to realize Bose-Einstein condensation of excitons in bulk semiconductors and semiconductor nanostructures, emphasizing on indirect (interwell) excitons in GaAs/AlGaAs coupled double quantum wells. Recent experiments with indirect excitons confined in a circular electric-field-induced in-plane trap are discussed. The observed spatially-ordered patterns in the photoluminescence signal and large coherence length are interpreted in terms of Bose-Einstein condensation of indirect excitons.
Alexei L. Ivanov and Sergei G. Tikhodeev (eds)
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780199238873
- eISBN:
- 9780191716652
- Item type:
- book
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199238873.001.0001
- Subject:
- Physics, Condensed Matter Physics / Materials
The book, which is dedicated to Prof. Leonid V. Keldysh on his 75th anniversary, is a collection of review papers written by experts in condensed matter physics such as V. M. Agranovich, B. L. ...
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The book, which is dedicated to Prof. Leonid V. Keldysh on his 75th anniversary, is a collection of review papers written by experts in condensed matter physics such as V. M. Agranovich, B. L. Altshuler, E. Burstein, V. L. Ginzburg, K. Von Klitzing, P. B. Littlewood, M. Pepper, A. Pinczuk, L. P. Pitaevskii, E. I. Rashba, T. M. Rice, etc. This is a guide-book of modern condensed matter physics, where the most important and hot topics of the field are reviewed. Topics covered include spintronics and quantum computation, Bose-Einstein condensation of excitons and the excitonic insulator, electron-hole liquid, metal-dielectric transition, coherent optical phenomena in semiconductor nanostructures, composite fermions and the quantum Hall effect, semiconductor and organic quantum wells, microcavities and other nanostructures, disordered systems in condensed matter, many-body theory and the Keldysh diagram technique, resonant acousto-optics, and inelastic electron tunneling spectroscopy.Less
The book, which is dedicated to Prof. Leonid V. Keldysh on his 75th anniversary, is a collection of review papers written by experts in condensed matter physics such as V. M. Agranovich, B. L. Altshuler, E. Burstein, V. L. Ginzburg, K. Von Klitzing, P. B. Littlewood, M. Pepper, A. Pinczuk, L. P. Pitaevskii, E. I. Rashba, T. M. Rice, etc. This is a guide-book of modern condensed matter physics, where the most important and hot topics of the field are reviewed. Topics covered include spintronics and quantum computation, Bose-Einstein condensation of excitons and the excitonic insulator, electron-hole liquid, metal-dielectric transition, coherent optical phenomena in semiconductor nanostructures, composite fermions and the quantum Hall effect, semiconductor and organic quantum wells, microcavities and other nanostructures, disordered systems in condensed matter, many-body theory and the Keldysh diagram technique, resonant acousto-optics, and inelastic electron tunneling spectroscopy.
Vladimir M. Agranovich
- Published in print:
- 2008
- Published Online:
- January 2009
- ISBN:
- 9780199234417
- eISBN:
- 9780191715426
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199234417.003.0001
- Subject:
- Physics, Atomic, Laser, and Optical Physics
This introductory chapter defines the main topics of the book. It recalls the notions of molecular crystals and of Frenkel-and Wannier-Mott excitons, giving basic properties and constitutive ...
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This introductory chapter defines the main topics of the book. It recalls the notions of molecular crystals and of Frenkel-and Wannier-Mott excitons, giving basic properties and constitutive equations. The relation between excitonic absorption spectrum and spectrum of excitonic luminescence is also given.Less
This introductory chapter defines the main topics of the book. It recalls the notions of molecular crystals and of Frenkel-and Wannier-Mott excitons, giving basic properties and constitutive equations. The relation between excitonic absorption spectrum and spectrum of excitonic luminescence is also given.
Vladimir M. Agranovich
- Published in print:
- 2008
- Published Online:
- January 2009
- ISBN:
- 9780199234417
- eISBN:
- 9780191715426
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199234417.003.0002
- Subject:
- Physics, Atomic, Laser, and Optical Physics
This chapter discusses Frenkel excitonic states in Heitler-London approximation. The Coulomb and mechanical excitons in molecular crystals are introduced using the crystal Hamiltonian. The excitons ...
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This chapter discusses Frenkel excitonic states in Heitler-London approximation. The Coulomb and mechanical excitons in molecular crystals are introduced using the crystal Hamiltonian. The excitons symmetry properties are considered via group-theoretical methods. Applications to crystals of naphthalene type are given.Less
This chapter discusses Frenkel excitonic states in Heitler-London approximation. The Coulomb and mechanical excitons in molecular crystals are introduced using the crystal Hamiltonian. The excitons symmetry properties are considered via group-theoretical methods. Applications to crystals of naphthalene type are given.
Vladimir M. Agranovich
- Published in print:
- 2008
- Published Online:
- January 2009
- ISBN:
- 9780199234417
- eISBN:
- 9780191715426
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199234417.003.0009
- Subject:
- Physics, Atomic, Laser, and Optical Physics
This chapter discusses the properties of excitons molecular structures containing several monolayers, and its spectra and nonlinear effects at interfaces. The different so-called gas-condensed matter ...
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This chapter discusses the properties of excitons molecular structures containing several monolayers, and its spectra and nonlinear effects at interfaces. The different so-called gas-condensed matter shift at surfaces and interfaces can be used for engineering of exciton spectra in multilayer structures with maximal or minimal energy of excitons at interface. The Fermi resonance for modes propagating along the interfaces and a bistable energy transmission across the interface with Fermi resonance under influence of pumping of molecular vibration from one side of interface is considered.Less
This chapter discusses the properties of excitons molecular structures containing several monolayers, and its spectra and nonlinear effects at interfaces. The different so-called gas-condensed matter shift at surfaces and interfaces can be used for engineering of exciton spectra in multilayer structures with maximal or minimal energy of excitons at interface. The Fermi resonance for modes propagating along the interfaces and a bistable energy transmission across the interface with Fermi resonance under influence of pumping of molecular vibration from one side of interface is considered.
V. M. Agranovich
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780199238873
- eISBN:
- 9780191716652
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199238873.003.0003
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter reviews the physics of conceptually new hybrid organic-inorganic semiconductor nanostructures. The resonant coupling between the Frenkel and Wannier-Mott exciton states in two different ...
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This chapter reviews the physics of conceptually new hybrid organic-inorganic semiconductor nanostructures. The resonant coupling between the Frenkel and Wannier-Mott exciton states in two different materials of the nanostructure can lead to fast and efficient non-contact and non-radiative energy transfer. Furthermore, the exciton-mediated nonlinearities are strongly enhanced in these artificial structures. A new family of light emitting devices based on the hybrid organic-inorganic semiconductor nanostructures is also discussed.Less
This chapter reviews the physics of conceptually new hybrid organic-inorganic semiconductor nanostructures. The resonant coupling between the Frenkel and Wannier-Mott exciton states in two different materials of the nanostructure can lead to fast and efficient non-contact and non-radiative energy transfer. Furthermore, the exciton-mediated nonlinearities are strongly enhanced in these artificial structures. A new family of light emitting devices based on the hybrid organic-inorganic semiconductor nanostructures is also discussed.
Elias Burstein
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780199238873
- eISBN:
- 9780191716652
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199238873.003.0006
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter reviews electric-field-induced Raman scattering of the light field, which resonates with the interband transition in a semiconductor. The role played by the Franz-Keldysh effect in ...
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This chapter reviews electric-field-induced Raman scattering of the light field, which resonates with the interband transition in a semiconductor. The role played by the Franz-Keldysh effect in surface space-charge electric-field-induced Raman scattering is emphasized. A strong enhancement of the efficiency of ‘forbidden’ exciton-mediated Raman scattering by applying a static electric field, the effect predicted and observed by the author and his colleagues, are also discussed.Less
This chapter reviews electric-field-induced Raman scattering of the light field, which resonates with the interband transition in a semiconductor. The role played by the Franz-Keldysh effect in surface space-charge electric-field-induced Raman scattering is emphasized. A strong enhancement of the efficiency of ‘forbidden’ exciton-mediated Raman scattering by applying a static electric field, the effect predicted and observed by the author and his colleagues, are also discussed.
L. V. Butov
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780199238873
- eISBN:
- 9780191716652
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199238873.003.0007
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter reviews recent achievements in the experimental realization of a cold but still dense gas of long-lived indirect excitons in GaAs-based coupled quantum well structures. The unusual ...
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This chapter reviews recent achievements in the experimental realization of a cold but still dense gas of long-lived indirect excitons in GaAs-based coupled quantum well structures. The unusual dynamics (photoluminescence jump) and pattern formation (inner and external rings, as well as fragmentation of the external ring in circular-shaped spots), which were detected in time-resolved and spatially-resolved photoluminescence associated with indirect excitons, are described in detail.Less
This chapter reviews recent achievements in the experimental realization of a cold but still dense gas of long-lived indirect excitons in GaAs-based coupled quantum well structures. The unusual dynamics (photoluminescence jump) and pattern formation (inner and external rings, as well as fragmentation of the external ring in circular-shaped spots), which were detected in time-resolved and spatially-resolved photoluminescence associated with indirect excitons, are described in detail.
Ivan Pelant and Jan Valenta
- Published in print:
- 2012
- Published Online:
- May 2012
- ISBN:
- 9780199588336
- eISBN:
- 9780191738548
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199588336.003.0007
- Subject:
- Physics, Atomic, Laser, and Optical Physics
Luminescence of excitons’ treats in a comprehensive way a series of luminescence manifestations of bound electron–hole pairs, i.e. excitons. First, the concept of a free Wannier exciton is introduced ...
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Luminescence of excitons’ treats in a comprehensive way a series of luminescence manifestations of bound electron–hole pairs, i.e. excitons. First, the concept of a free Wannier exciton is introduced and a shape of the pertinent absorption spectrum is described. Then multiple luminescence effects due to the free exciton radiative recombination are discussed in direct bandgap materials (exciton–polariton luminescence and LO-phonon assisted exciton annihilation) as well as in indirect bandgap materials (no-phonon luminescence, phonon replicas). Relevant selection rules are derived. Various kinds of excitons bound to impurities (neutral and/or ionized donors and acceptors, Haynes’ rule) are dealt with. Description of the luminescence of bound multiexciton complexes follows. The application of the bound exciton concept to quantitative impurity analysis in silicon is described. Finally, the cases of excitons bound to isoelectronic impurities and of self-trapped excitons are analyzed. Whenever meaningful, a particular characteristic emission lineshape that helps to decipher experimental spectrum is pointed out.Less
Luminescence of excitons’ treats in a comprehensive way a series of luminescence manifestations of bound electron–hole pairs, i.e. excitons. First, the concept of a free Wannier exciton is introduced and a shape of the pertinent absorption spectrum is described. Then multiple luminescence effects due to the free exciton radiative recombination are discussed in direct bandgap materials (exciton–polariton luminescence and LO-phonon assisted exciton annihilation) as well as in indirect bandgap materials (no-phonon luminescence, phonon replicas). Relevant selection rules are derived. Various kinds of excitons bound to impurities (neutral and/or ionized donors and acceptors, Haynes’ rule) are dealt with. Description of the luminescence of bound multiexciton complexes follows. The application of the bound exciton concept to quantitative impurity analysis in silicon is described. Finally, the cases of excitons bound to isoelectronic impurities and of self-trapped excitons are analyzed. Whenever meaningful, a particular characteristic emission lineshape that helps to decipher experimental spectrum is pointed out.
P. B. Littlewood
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780199238873
- eISBN:
- 9780191716652
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199238873.003.0011
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter discusses a collective coherent ground state in ‘exciton-like’ many-body systems (excitons, microcavity polaritons, quantum Hall bilayers, dimer spin systems, ultracold atomic fermi ...
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This chapter discusses a collective coherent ground state in ‘exciton-like’ many-body systems (excitons, microcavity polaritons, quantum Hall bilayers, dimer spin systems, ultracold atomic fermi gases, etc.) in terms of Bose-Einstein condensation. With both cases, the high-density limit (BCS limit) and low-density limit (BEC limit) are described in a unified way. The decoherence effects which are relevant to a thermodynamically open system such as short-lived microcavity polaritons are outlined.Less
This chapter discusses a collective coherent ground state in ‘exciton-like’ many-body systems (excitons, microcavity polaritons, quantum Hall bilayers, dimer spin systems, ultracold atomic fermi gases, etc.) in terms of Bose-Einstein condensation. With both cases, the high-density limit (BCS limit) and low-density limit (BEC limit) are described in a unified way. The decoherence effects which are relevant to a thermodynamically open system such as short-lived microcavity polaritons are outlined.
T. Maurice Rice
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780199238873
- eISBN:
- 9780191716652
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199238873.003.0015
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter describes metal-insulator transitions in disorder-free crystals. It reviews excitonic insulators, electron-hole liquids, and metal-insulator transitions due to band crossing. The ...
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This chapter describes metal-insulator transitions in disorder-free crystals. It reviews excitonic insulators, electron-hole liquids, and metal-insulator transitions due to band crossing. The realization of exciton (Bose-Einstein) condensate in the high-density limit is illustrated by experiments on a quantum Hall bilayer. In the second part of the chapter, the Mott transition from a metal to a Coulomb localized insulator is discussed in terms of the one band Hubbard model.Less
This chapter describes metal-insulator transitions in disorder-free crystals. It reviews excitonic insulators, electron-hole liquids, and metal-insulator transitions due to band crossing. The realization of exciton (Bose-Einstein) condensate in the high-density limit is illustrated by experiments on a quantum Hall bilayer. In the second part of the chapter, the Mott transition from a metal to a Coulomb localized insulator is discussed in terms of the one band Hubbard model.
N. N. Sibeldin
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780199238873
- eISBN:
- 9780191716652
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199238873.003.0016
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter reviews an electron-hole liquid. This very interesting phase — observed mainly in bulk indirect semiconductors, Ge and Si — was thoroughly investigated in the late 1960s to mid 1980s. ...
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This chapter reviews an electron-hole liquid. This very interesting phase — observed mainly in bulk indirect semiconductors, Ge and Si — was thoroughly investigated in the late 1960s to mid 1980s. The first finding of the electron-hole liquid with the following study of its many unusual properties was initiated by L. V. Keldysh.Less
This chapter reviews an electron-hole liquid. This very interesting phase — observed mainly in bulk indirect semiconductors, Ge and Si — was thoroughly investigated in the late 1960s to mid 1980s. The first finding of the electron-hole liquid with the following study of its many unusual properties was initiated by L. V. Keldysh.
A. L. Ivanov
- Published in print:
- 2007
- Published Online:
- May 2008
- ISBN:
- 9780199238873
- eISBN:
- 9780191716652
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199238873.003.0019
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter reviews the recently proposed concept of resonant acousto-optics, when interaction between the light and acoustic waves is mediated and strongly enhanced by the polarization field ...
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This chapter reviews the recently proposed concept of resonant acousto-optics, when interaction between the light and acoustic waves is mediated and strongly enhanced by the polarization field associated with either excitons (i.e., visible spectral band) or TO-phonons (THz band). For the resonant acousto-optics, both dominant interactions — the polarization-light coupling (polariton effect) and the interaction of the polarization wave with the acoustically-induced grating — are treated non-perturbatively (strong coupling regime) and on an equal basis.Less
This chapter reviews the recently proposed concept of resonant acousto-optics, when interaction between the light and acoustic waves is mediated and strongly enhanced by the polarization field associated with either excitons (i.e., visible spectral band) or TO-phonons (THz band). For the resonant acousto-optics, both dominant interactions — the polarization-light coupling (polariton effect) and the interaction of the polarization wave with the acoustically-induced grating — are treated non-perturbatively (strong coupling regime) and on an equal basis.
William Barford
- Published in print:
- 2013
- Published Online:
- May 2013
- ISBN:
- 9780199677467
- eISBN:
- 9780191757402
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199677467.003.0006
- Subject:
- Physics, Condensed Matter Physics / Materials
Excitons are the primary photo-excited states in conjugated polymers. This chapter develops effective-particle models of excitons in the weak and strong-coupling limits. Excitons are classified as ...
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Excitons are the primary photo-excited states in conjugated polymers. This chapter develops effective-particle models of excitons in the weak and strong-coupling limits. Excitons are classified as being Mott-Wannier in the weak-coupling limit. This class includes Frenkel, charge-transfer, and Wannier excitons. An exciton wavefunction mapping is introduced that transforms configuration interaction amplitudes into real-space wavefunctions. Excitons are classified as being Mott-Hubbard in the strong-coupling limit. Finally, numerical calculations of the intermediate coupling regime are described.Less
Excitons are the primary photo-excited states in conjugated polymers. This chapter develops effective-particle models of excitons in the weak and strong-coupling limits. Excitons are classified as being Mott-Wannier in the weak-coupling limit. This class includes Frenkel, charge-transfer, and Wannier excitons. An exciton wavefunction mapping is introduced that transforms configuration interaction amplitudes into real-space wavefunctions. Excitons are classified as being Mott-Hubbard in the strong-coupling limit. Finally, numerical calculations of the intermediate coupling regime are described.