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.

引用

页数：10

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