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Chin. Phys. B, 2016, Vol. 25(5): 056502    DOI: 10.1088/1674-1056/25/5/056502
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

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
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 2kB 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.
Keywords:  quantum dot      Rashba spin-orbit interaction      thermal and magnetic properties  
Received:  02 December 2015      Revised:  01 February 2016      Published:  05 May 2016
PACS:  65.80.-g (Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)  
  75.75.-c (Magnetic properties of nanostructures)  
Fund: Project support by the University Grants Commission, India, the Department of Science and Technology, and the University Grants Commission-Basic Science Research (UGC-BSR).
Corresponding Authors:  Sukirti Gumber     E-mail:  sukirti.du@gmail.com

Cite this article: 

Sukirti Gumber, Manoj Kumar, Pradip Kumar Jha, Man Mohan Thermodynamic behaviour of Rashba quantum dot in the presence of magnetic field 2016 Chin. Phys. B 25 056502

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