Exciton spin relaxation in single semiconductor quantum dots

被引：67
|
作者：
Tsitsishvili, E
von Baltz, R
Kalt, H
机构：
[1] Univ Karlsruhe, Inst Theorie Kondensierten Mat, D-76128 Karlsruhe, Germany
[2] Univ Karlsruhe, Inst Angew Phys, D-76128 Karlsruhe, Germany
[3] Acad Sci, Inst Cybernet, GE-380086 Tbilisi, Georgia
来源：
PHYSICAL REVIEW B | 2003年 / 67卷 / 20期
关键词：
D O I：
10.1103/PhysRevB.67.205330
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study the relaxation of the exciton spin (longitudinal relaxation time T-1) in single asymmetrical quantum dots due to an interplay of the short-range exchange interaction and acoustic-phonon deformation. The calculated relaxation rates are found to depend strongly on the dot size, magnetic field, and temperature. For typical quantum dots and temperatures below 100 K, the zero-magnetic field relaxation times are long compared to the exciton lifetime, yet they are strongly reduced in high magnetic fields. We discuss explicitly quantum dots based on (In,Ga)As and (Cd,Zn)Se semiconductor compounds.
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页数：6
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