Symmetry and size effects on energy and entanglement of an exciton in coupled quantum dots

doi:10.1088/1674-1056/22/4/047101

Chin. Phys. B ›› 2013, Vol. 22 ›› Issue (4): 47101-047101.doi: 10.1088/1674-1056/22/4/047101

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Symmetry and size effects on energy and entanglement of an exciton in coupled quantum dots

沈曼^a, 白彦魁^a, 安兴涛^b, 刘建军^{a c}

a College of Physics Science & Information Engineering and Hebei Advanced Thin Film Laboratory, Hebei Normal University, Shijiazhuang 050024, China;
b School of Sciences, Hebei University of Science and Technology, Shijiazhuang, 050018, China;
c Physics Department, Shijiazhuang University, Shijiazhuang 050035, China

收稿日期:2012-08-06 修回日期:2012-10-16 出版日期:2013-03-01 发布日期:2013-03-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61176089 and 10905016) and the Natural Science Foundation of Hebei Province, China (Grant Nos. A2011205092 and A2011208010).

Symmetry and size effects on energy and entanglement of an exciton in coupled quantum dots

Shen Man (沈曼)^a, Bai Yan-Kui (白彦魁)^a, An Xing-Tao (安兴涛)^b, Liu Jian-Jun (刘建军)^{a c}

a College of Physics Science & Information Engineering and Hebei Advanced Thin Film Laboratory, Hebei Normal University, Shijiazhuang 050024, China;
b School of Sciences, Hebei University of Science and Technology, Shijiazhuang, 050018, China;
c Physics Department, Shijiazhuang University, Shijiazhuang 050035, China

Received:2012-08-06 Revised:2012-10-16 Online:2013-03-01 Published:2013-03-01
Contact: Liu Jian-Jun E-mail:liujj@mail.hebtu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61176089 and 10905016) and the Natural Science Foundation of Hebei Province, China (Grant Nos. A2011205092 and A2011208010).

摘要/Abstract

摘要： We study theoretically the essential properties of an exciton in vertically coupled Gaussian quantum dots in the presence of an external magnetic field. The ground state energy of a heavy-hole exciton is split into four energy levels due to the Zeeman effect. For the symmetrical system, the entanglement entropy of the exciton state can reach a value of 1. However, for a system with broken symmetry, it is close to zero. Our results are in good agreement with previous studies.

关键词: exciton, coupled Gaussian quantum dot, symmetry, entanglement entropy

Abstract: We study theoretically the essential properties of an exciton in vertically coupled Gaussian quantum dots in the presence of an external magnetic field. The ground state energy of a heavy-hole exciton is split into four energy levels due to the Zeeman effect. For the symmetrical system, the entanglement entropy of the exciton state can reach a value of 1. However, for a system with broken symmetry, it is close to zero. Our results are in good agreement with previous studies.

Key words: exciton, coupled Gaussian quantum dot, symmetry, entanglement entropy

中图分类号: (Excitons in magnetic fields; magnetoexcitons)

71.35.Ji

73.21.La (Quantum dots) 73.22.Gk (Broken symmetry phases)

沈曼, 白彦魁, 安兴涛, 刘建军. Symmetry and size effects on energy and entanglement of an exciton in coupled quantum dots[J]. Chin. Phys. B, 2013, 22(4): 47101-047101.

Shen Man (沈曼), Bai Yan-Kui (白彦魁), An Xing-Tao (安兴涛), Liu Jian-Jun (刘建军). Symmetry and size effects on energy and entanglement of an exciton in coupled quantum dots[J]. Chin. Phys. B, 2013, 22(4): 47101-047101.

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Symmetry and size effects on energy and entanglement of an exciton in coupled quantum dots

Symmetry and size effects on energy and entanglement of an exciton in coupled quantum dots

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