Abstract
The homogeneous linewidths of excitons in wet-etched ZnSe quantum wires of lateral sizes down to 23 nm are studied by transient four-wave mixing. The low-density dephasing time is found to increase with decreasing wire width. This is attributed mainly to a reduction of electron-exciton scattering within the wire due to the electron trapping in surface states and exciton localization. The exciton-exciton scattering efficiency, determined by the density dependence of the exciton dephasing, is found to increase with decreasing win width. This is assigned to the reduced phase space in a quasi-one-dimensional system, enhancing the repulsive interaction between excitons due to Pauli blocking.
Original language | English |
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Journal | Physical Review B |
Volume | 57 |
Issue number | 3 |
Pages (from-to) | 1797-1800 |
ISSN | 2469-9950 |
DOIs | |
Publication status | Published - 1998 |
Bibliographical note
Copyright (1998) by the American Physical Society.Keywords
- SEMICONDUCTORS
- RELAXATION
- SHIFT
- CDSE
- SCATTERING
- WELLS
- ROOM-TEMPERATURE
- BEATS
- FEMTOSECOND COHERENT SPECTROSCOPY
- EMISSION