Back-action-driven electron spin excitation in a single quantum dot

被引：4
|
作者：
Cao, Gang [1 ]
Xiao, Ming [2 ]
Li, HaiOu [1 ]
Zhou, Cheng [1 ]
Shang, RuNan [1 ]
Tu, Tao [1 ]
Jiang, HongWen [3 ]
Guo, GuoPing [1 ]
机构：
[1] Univ Sci & Technol China, Key Lab Quantum Informat, Chinese Acad Sci, Hefei 230026, Peoples R China
[2] Univ Sci & Technol China, Dept Opt & Opt Engn, Chinese Acad Sci, Hefei 230026, Peoples R China
[3] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
来源：
NEW JOURNAL OF PHYSICS | 2013年 / 15卷
关键词：
NOISE;
D O I：
10.1088/1367-2630/15/2/023021
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We perform real-time charge counting with a quantum point contact (QPC) for the last six electrons in a single quantum dot. At zero magnetic field, the charge-counting statistics show distinctive non-thermal-equilibrium effects for the even and odd electron numbers. A detailed study relates this difference to the excitation from the spin singlet state to triplet states driven by QPC back-action. At a finite magnetic field, spin excitations to different triplet states and Zeeman states are also observed. A master-equation model is developed to quantitatively characterize the back-action-driven spin excitation rate.
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页数：10
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