Thermodynamic behaviour of Rashba quantum dot in the presence of magnetic field

doi:10.1088/1674-1056/25/5/056502

中国物理B ›› 2016, Vol. 25 ›› Issue (5): 56502-056502.doi: 10.1088/1674-1056/25/5/056502

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Thermodynamic behaviour of Rashba quantum dot in the presence of magnetic field

Sukirti Gumber, Manoj Kumar, Pradip Kumar Jha, Man Mohan

1. Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India;
2. Department of Physics, DDU College, University of Delhi, Delhi 110015, India

收稿日期:2015-12-02 修回日期:2016-02-01 出版日期:2016-05-05 发布日期:2016-05-05
通讯作者: Sukirti Gumber E-mail:sukirti.du@gmail.com
基金资助:
Project support by the University Grants Commission, India, the Department of Science and Technology, and the University Grants Commission-Basic Science Research (UGC-BSR).

Thermodynamic behaviour of Rashba quantum dot in the presence of magnetic field

Sukirti Gumber¹, Manoj Kumar¹, Pradip Kumar Jha², Man Mohan¹

1. Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India;
2. Department of Physics, DDU College, University of Delhi, Delhi 110015, India

Received:2015-12-02 Revised:2016-02-01 Online:2016-05-05 Published:2016-05-05
Contact: Sukirti Gumber E-mail:sukirti.du@gmail.com
Supported by:
Project support by the University Grants Commission, India, the Department of Science and Technology, and the University Grants Commission-Basic Science Research (UGC-BSR).

摘要/Abstract

摘要： The thermodynamic properties of an InSb quantum dot have been investigated in the presence of Rashba spin-orbit interaction and a static magnetic field. The energy spectrum and wave-functions for the system are obtained by solving the Schrodinger wave-equation analytically. These energy levels are employed to calculate the specific heat, entropy, magnetization and susceptibility of the quantum dot system using canonical formalism. It is observed that the system is susceptible to maximum heat absorption at a particular value of magnetic field which depends on the Rashba coupling parameter as well as the temperature. The variation of specific heat shows a Schottky-like anomaly in the low temperature limit and rapidly converges to the value of 2k_B with the further increase in temperature. The entropy of the quantum dot is found to be inversely proportional to the magnetic field but has a direct variation with temperature. The substantial effect of Rashba spin-orbit interaction on the magnetic properties of quantum dot is observed at low values of magnetic field and temperature.

关键词: quantum dot, Rashba spin-orbit interaction, thermal and magnetic properties

Abstract: The thermodynamic properties of an InSb quantum dot have been investigated in the presence of Rashba spin-orbit interaction and a static magnetic field. The energy spectrum and wave-functions for the system are obtained by solving the Schrodinger wave-equation analytically. These energy levels are employed to calculate the specific heat, entropy, magnetization and susceptibility of the quantum dot system using canonical formalism. It is observed that the system is susceptible to maximum heat absorption at a particular value of magnetic field which depends on the Rashba coupling parameter as well as the temperature. The variation of specific heat shows a Schottky-like anomaly in the low temperature limit and rapidly converges to the value of 2k_B with the further increase in temperature. The entropy of the quantum dot is found to be inversely proportional to the magnetic field but has a direct variation with temperature. The substantial effect of Rashba spin-orbit interaction on the magnetic properties of quantum dot is observed at low values of magnetic field and temperature.

Key words: quantum dot, Rashba spin-orbit interaction, thermal and magnetic properties

中图分类号: (Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)

65.80.-g

75.75.-c (Magnetic properties of nanostructures)

Sukirti Gumber, Manoj Kumar, Pradip Kumar Jha, Man Mohan. Thermodynamic behaviour of Rashba quantum dot in the presence of magnetic field[J]. 中国物理B, 2016, 25(5): 56502-056502.

Sukirti Gumber, Manoj Kumar, Pradip Kumar Jha, Man Mohan. Thermodynamic behaviour of Rashba quantum dot in the presence of magnetic field[J]. Chin. Phys. B, 2016, 25(5): 56502-056502.

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Thermodynamic behaviour of Rashba quantum dot in the presence of magnetic field

Thermodynamic behaviour of Rashba quantum dot in the presence of magnetic field

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