Dominant channels of exciton spin relaxation in photoexcited self-assembled (In,Ga)As quantum dots
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comunitat-uji-handle2:10234/7013
comunitat-uji-handle3:10234/8638
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Title
Dominant channels of exciton spin relaxation in photoexcited self-assembled (In,Ga)As quantum dotsDate
2011-04-22Publisher
American Physical SocietyISSN
1098-0121; 1550-235XBibliographic citation
Physical Review B (2011) vol. 83, no. 16Type
info:eu-repo/semantics/articlePublisher version
http://link.aps.org/doi/10.1103/PhysRevB.83.165317Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
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 ... [+]
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 ∼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 15 K. [-]
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