Ultrafast carrier dynamics in semiconductor nanostructures: interplay between coherence and relaxation |
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| Institution: | 1. Department of Cardiology, Seoul St. Mary''s Hospital, The Catholic University of Korea, Seoul, Republic of Korea;2. Department of Medical Informatics, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea;3. Seoul National University College of Medicine, Seoul, Republic of Korea;4. Office of Hospital Information, Seoul National University Hospital, Seoul, Republic of Korea;5. Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea;6. Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea |
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| Abstract: | The strong coupling between coherent and incoherent ultrafast phenomena in the electro-optical response of semiconductor nanostructures is discussed theoretically within a density matrix formalism. In particular, the problem of scattering-induced damping of Bloch oscillations in superlattices is reviewed. Moreover, a generalization to ‘open systems’ of the conventional semiconductor Bloch equations is discussed. The presence of spatial boundary conditions manifests itself through self-energy corrections and additional source terms in the kinetic equations. As an example, some simulated experiments of quantum transport phenomena through double-barrier structures are reviewed. |
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