Persistent current in a correlated quantum ring with electron-phonon interaction in the presence of Rashba interaction and Aharonov-Bohm flux

被引：19
|
作者：
Monisha, P. J. [1 ]
Sankar, I. V. [1 ]
Sil, Shreekantha [2 ]
Chatterjee, Ashok [1 ]
机构：
[1] Univ Hyderabad, Sch Phys, Hyderabad 500046, Andhra Pradesh, India
[2] Visva Bharati Santiniketan, Dept Phys, Santini Ketan 731235, W Bengal, India
来源：
SCIENTIFIC REPORTS | 2016年 / 6卷
关键词：
HUBBARD-MODEL; TRANSITION; BEHAVIOR;
D O I：
10.1038/srep20056
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Persistent current in a correlated quantum ring threaded by an Aharonov-Bohm flux is studied in the presence of electron-phonon interactions and Rashba spin-orbit coupling. The quantum ring is modeled by the Holstein-Hubbard-Rashba Hamiltonian and the energy is calculated by performing the conventional Lang-Firsov transformation followed by the diagonalization of the effective Hamiltonian within a mean-field approximation. The effects of Aharonov-Bohm flux, temperature, spin-orbit and electron-phonon interactions on the persistent current are investigated. It is shown that the electron-phonon interactions reduce the persistent current, while the Rashba coupling enhances it. It is also shown that temperature smoothens the persistent current curve. The effect of chemical potential on the persistent current is also studied.
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页数：8
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