Time-resolved optical spin orientation spectroscopy was employed to investigate the temperature-dependent electron spin injection in In0.1Ga0.9As quantum well (QW) and In0.5Ga0.5As quantum dots (QDs) tunnel-coupled nanostructures with 4, 6, and 8 nm-thick GaAs barriers. The fast picosecond-ranged spin injection from QW to QD excited states (ES) was observed to speed up with temperature, as induced by pronounced longitudinal-optical (LO)-phonon-involved multiple scattering process, which contributes to a thermally stable and almost fully spin-conserving injection within 5–180 K. The LO-phonon coupling was also found to cause accelerated electron spin relaxation of QD ES at elevated temperature, mainly via hyperfine interaction with random nuclear field.
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21 March 2016
Research Article|
March 15 2016
Temperature-dependent spin injection dynamics in InGaAs/GaAs quantum well-dot tunnel-coupled nanostructures Available to Purchase
S. L. Chen
;
S. L. Chen
a)
1Graduate School of Information Science and Technology,
Hokkaido University
, Kita 14, Nishi 9, Kita-ku, Sapporo 060-0814, Japan
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T. Kiba;
T. Kiba
2
Kitami Institute of Technology
, 165 Koen-cho, Kitami, Hokkaido 090-8507, Japan
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X. J. Yang;
X. J. Yang
3
Suzhou QiangMing Optoelectronics, Co. Ltd.
, Jiangsu, China
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J. Takayama
;
J. Takayama
1Graduate School of Information Science and Technology,
Hokkaido University
, Kita 14, Nishi 9, Kita-ku, Sapporo 060-0814, Japan
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A. Murayama
A. Murayama
1Graduate School of Information Science and Technology,
Hokkaido University
, Kita 14, Nishi 9, Kita-ku, Sapporo 060-0814, Japan
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S. L. Chen
1,a)
T. Kiba
2
X. J. Yang
3
J. Takayama
1
A. Murayama
1
1Graduate School of Information Science and Technology,
Hokkaido University
, Kita 14, Nishi 9, Kita-ku, Sapporo 060-0814, Japan
2
Kitami Institute of Technology
, 165 Koen-cho, Kitami, Hokkaido 090-8507, Japan
3
Suzhou QiangMing Optoelectronics, Co. Ltd.
, Jiangsu, China
a)
Electronic mail: [email protected]
J. Appl. Phys. 119, 115701 (2016)
Article history
Received:
November 22 2015
Accepted:
March 03 2016
Citation
S. L. Chen, T. Kiba, X. J. Yang, J. Takayama, A. Murayama; Temperature-dependent spin injection dynamics in InGaAs/GaAs quantum well-dot tunnel-coupled nanostructures. J. Appl. Phys. 21 March 2016; 119 (11): 115701. https://doi.org/10.1063/1.4944039
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