Time-resolved DFWM, excite/probe and transient grating studies of InxGa1-xAs/GaAs superlattices
| Autor: | G V M Williams, K Woodbridge, C C Phillips |
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| Rok vydání: | 1994 |
| Předmět: |
Condensed Matter::Quantum Gases
Absorption spectroscopy Condensed matter physics Condensed Matter::Other Chemistry Exciton Dephasing Superlattice Grating Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Molecular physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Laser linewidth Four-wave mixing Materials Chemistry Electrical and Electronic Engineering Temperature coefficient |
| Zdroj: | Semiconductor Science and Technology. 9:1096-1101 |
| ISSN: | 1361-6641 0268-1242 |
| DOI: | 10.1088/0268-1242/9/5/014 |
| Popis: | Low-temperature time-resolved degenerate four-wave mixing (DFWM), single-beam excite/probe and transient grating measurements have been performed on InxGa1-xAs/GaAs superlattices with thin ( approximately 6 nm) InxGa1-xAs wells. We find weak dephasing of heavy-hole (hh) excitons by acoustic phonons. The hh exciton homogeneous linewidth temperature coefficient is 1.9+or-1 mu eV K-1. The low-temperature hh exciton optical nonlinearity is successfully modelled in terms of exciton phase-space filling and exchange interactions in the hh exciton gas. From low-temperature transient grating measurements we find hh exciton in-plane mobilities as high as 6.7*104 cm2 V-1 s-1 and mobilities which are greater in superlattices with thinner barriers. |
| Databáze: | OpenAIRE |
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