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Microscopic Theory of Linear and Nonlinear Terahertz Spectroscopy of Semiconductors
This Thesis presents a fully microscopic theory to describe terahertz (THz)-induced processes in optically-excited semiconductors. The formation process of excitons and other quasi-particles after optical excitation has been studied in great detail for a variety of conditions. Here, the formation pr...
Wedi'i Gadw mewn:
| Prif Awdur: | |
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| Awduron Eraill: | |
| Fformat: | Dissertation |
| Iaith: | Saesneg |
| Cyhoeddwyd: |
Philipps-Universität Marburg
2008
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| Pynciau: | |
| Mynediad Ar-lein: | Testun PDF llawn |
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| Crynodeb: | This Thesis presents a fully microscopic theory to describe terahertz (THz)-induced processes in optically-excited semiconductors. The formation process of excitons and other quasi-particles after optical excitation has been studied in great detail for a variety of conditions. Here, the formation process is not modelled but a realistic initial many-body state is assumed. In particular, the linear THz response is reviewed and it is demonstrated that correlated quasi-particles such as excitons and plasmons can be unambiguously detected via THz spectroscopy. The focus of the investigations, however, is on situations where the optically-excited many-body state is excited by intense THz fields. While weak pulses detect the many-body state, strong THz pulses control and manipulate the quasi-particles in a way that is not accessible via conventional techniques. The nonlinear THz dynamics of exciton populations is especially interesting because similarities and differences to optics with atomic systems can be studied. |
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| Disgrifiad Corfforoll: | 139 Seiten |
| DOI: | 10.17192/z2009.0275 |