Spin dynamics and level structure of quantum-dot quantum wells

被引：23
|
作者：
Berezovsky, J [1 ]
Ouyang, M
Meier, F
Awschalom, DD
Battaglia, D
Peng, XG
机构：
[1] Univ Calif Santa Barbara, Ctr Spintron & Quantum Computat, Santa Barbara, CA 93106 USA
[2] Univ Arkansas, Dept Chem & Biochem, Fayetteville, AR 72701 USA
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 08期
关键词：
D O I：
10.1103/PhysRevB.71.081309
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have characterized CdS/CdSe/CdS quantum-dot quantum wells using time-resolved Faraday rotation (TRFR). The spin dynamics shows that the electron g factor varies as a function of quantum well width and the transverse spin lifetime of several nanoseconds is robust up to room temperature. As a function of probe energy, the amplitude of the TRFR signal shows pronounced resonances, which allow one to identify individual exciton transitions. The resonance energies in the TRFR data are consistent with different exciton transitions in which the electron occupies the conduction-band ground state.
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页数：4
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