標題: | Dominant channels of exciton spin relaxation in photoexcited self-assembled (In,Ga)As quantum dots |
作者: | Liao, Yu-Huai Climente, Juan I. Cheng, Shun-Jen 電子物理學系 Department of Electrophysics |
公開日期: | 22-四月-2011 |
摘要: | We present a comprehensive theoretical investigation of spin relaxation processes of excitons in photoexcited self-assembled quantum dots. The exciton spin relaxations are considered between dark- and bright-exciton states via the channels created by various spin-admixture mechanisms, including electron Rashba and Dresselhaus spin-orbital couplings (SOCs), hole linear and hole cubic SOCs, and electron hyperfine interactions, incorporated with single-and double-phonon processes. The hole-Dresselhaus SOC is identified as the dominant spin-admixture mechanism, leading to relaxation rates as fast as similar to 10(-2) ns(-1), consistent with recent observations. Moreover, due to significant electron-hole exchange interactions, single-phonon processes are unusually dominant over two-phonon ones in a photoexcited dot even at temperatures as high as 15K. |
URI: | http://dx.doi.org/10.1103/PhysRevB.83.165317 http://hdl.handle.net/11536/8987 |
ISSN: | 1098-0121 |
DOI: | 10.1103/PhysRevB.83.165317 |
期刊: | PHYSICAL REVIEW B |
Volume: | 83 |
Issue: | 16 |
起始頁: | 0 |
結束頁: | 0 |
顯示於類別: | 期刊論文 |