V.F. Gantmakher
- Published in print:
- 2005
- Published Online:
- September 2007
- ISBN:
- 9780198567561
- eISBN:
- 9780191718267
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780198567561.003.0006
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter presents phenomenological scaling theory of quantum metal-insulator transition of non-interacting electrons. It confirms the existence of the transition in 3D-system; and elucidates the ...
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This chapter presents phenomenological scaling theory of quantum metal-insulator transition of non-interacting electrons. It confirms the existence of the transition in 3D-system; and elucidates the relation between the correlation length and the conductance, the shape of the critical region, and the temperature dependence of the conductance inside it (T1/3-law). For 2D-systems, it predicts that there is no transition, only a weak-to-strong localization crossover.Less
This chapter presents phenomenological scaling theory of quantum metal-insulator transition of non-interacting electrons. It confirms the existence of the transition in 3D-system; and elucidates the relation between the correlation length and the conductance, the shape of the critical region, and the temperature dependence of the conductance inside it (T1/3-law). For 2D-systems, it predicts that there is no transition, only a weak-to-strong localization crossover.
S. D. Ganichev and W. Prettl
- Published in print:
- 2005
- Published Online:
- September 2007
- ISBN:
- 9780198528302
- eISBN:
- 9780191713637
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780198528302.003.0005
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter discusses terahertz radiation-induced saturation of absorption, including incoherent and coherent saturation effects. Saturation due to slow relaxation and Rabi oscillations in various ...
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This chapter discusses terahertz radiation-induced saturation of absorption, including incoherent and coherent saturation effects. Saturation due to slow relaxation and Rabi oscillations in various bulk and low-dimension semiconductors is discussed from theoretical and experimental perspectives. It is shown that THz saturation experiments provide a powerful method for studying the kinetics and the details of the relaxation processes in bulk and low dimensional materials. In particular, spin relaxation times in low dimensional systems at monopolar spin orientation become experimentally accessible, which are of interest for the current topic of spintronics.Less
This chapter discusses terahertz radiation-induced saturation of absorption, including incoherent and coherent saturation effects. Saturation due to slow relaxation and Rabi oscillations in various bulk and low-dimension semiconductors is discussed from theoretical and experimental perspectives. It is shown that THz saturation experiments provide a powerful method for studying the kinetics and the details of the relaxation processes in bulk and low dimensional materials. In particular, spin relaxation times in low dimensional systems at monopolar spin orientation become experimentally accessible, which are of interest for the current topic of spintronics.
Miriam Solomon
- Published in print:
- 2015
- Published Online:
- June 2015
- ISBN:
- 9780198732617
- eISBN:
- 9780191796838
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780198732617.003.0007
- Subject:
- Philosophy, Metaphysics/Epistemology, Philosophy of Science
Translational medicine emerged in the early 2000s. Its main focus (T1) is “bench to bedside and back” research. This chapter argues that the focus on evidence-based medicine in the 1990s obscured the ...
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Translational medicine emerged in the early 2000s. Its main focus (T1) is “bench to bedside and back” research. This chapter argues that the focus on evidence-based medicine in the 1990s obscured the need for different methods in the context of discovery. Translational medicine recommends trial-and-error methods, along with mechanistic (pathophysiological) reasoning, to develop interventions which can then be tested in evidence-based medicine. Translational medicine also recommends changes in the social structure of research. Although Martin Wehling argues that we need more methodological rigor in translational medicine, this chapter is skeptical about whether such rigor is possible. With the metaphor of translation, translational medicine also offers hope that early failures in genetic technology and stem cell research can be surmounted. A subsidiary focus of translational medicine is T2, consisting of dissemination of research from “bedside to community.” T2 continues the work of medical consensus conferences.Less
Translational medicine emerged in the early 2000s. Its main focus (T1) is “bench to bedside and back” research. This chapter argues that the focus on evidence-based medicine in the 1990s obscured the need for different methods in the context of discovery. Translational medicine recommends trial-and-error methods, along with mechanistic (pathophysiological) reasoning, to develop interventions which can then be tested in evidence-based medicine. Translational medicine also recommends changes in the social structure of research. Although Martin Wehling argues that we need more methodological rigor in translational medicine, this chapter is skeptical about whether such rigor is possible. With the metaphor of translation, translational medicine also offers hope that early failures in genetic technology and stem cell research can be surmounted. A subsidiary focus of translational medicine is T2, consisting of dissemination of research from “bedside to community.” T2 continues the work of medical consensus conferences.
