Negative tunnel magnetoresistance in a quantum dot induced by interplay of a Majorana fermion and thermal-driven ferromagnetic leads

doi:10.1088/1674-1056/abf10b

中国物理B ›› 2021, Vol. 30 ›› Issue (9): 97401-097401.doi: 10.1088/1674-1056/abf10b

Negative tunnel magnetoresistance in a quantum dot induced by interplay of a Majorana fermion and thermal-driven ferromagnetic leads

Peng-Bin Niu(牛鹏斌)^1,†, Bo-Xiang Cui(崔博翔)¹, and Hong-Gang Luo(罗洪刚)^2,3

1 Department of Physics, Shanxi Datong University, Datong 037009, China;
2 School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;
3 Beijing Computational Science Research Center, Beijing 100084, China

收稿日期:2021-01-18 修回日期:2021-02-23 接受日期:2021-03-23 出版日期:2021-08-19 发布日期:2021-08-19
通讯作者: Peng-Bin Niu E-mail:niupengbin@163.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11834005 and 11674139).

Negative tunnel magnetoresistance in a quantum dot induced by interplay of a Majorana fermion and thermal-driven ferromagnetic leads

Peng-Bin Niu(牛鹏斌)^1,†, Bo-Xiang Cui(崔博翔)¹, and Hong-Gang Luo(罗洪刚)^2,3

1 Department of Physics, Shanxi Datong University, Datong 037009, China;
2 School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;
3 Beijing Computational Science Research Center, Beijing 100084, China

Received:2021-01-18 Revised:2021-02-23 Accepted:2021-03-23 Online:2021-08-19 Published:2021-08-19
Contact: Peng-Bin Niu E-mail:niupengbin@163.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11834005 and 11674139).

摘要/Abstract

摘要： We investigate the spin-related currents and tunnel magnetoresistance through a quantum dot, which is side-coupled with a Majorana fermion zero mode and two thermal-driven ferromagnetic electrodes. It is found that the interplay of Majorana fermion and electrodes' spin polarization can induce a nonlinear thermal-bias spin current. This interplay also decreases the total magnitude of spin or charge current, in either parallel or antiparallel configuration. In addition, a thermal-driven negative tunnel magnetoresistance is found, which is an unique feature to characterize Majorana fermion. With large temperature difference, a step phenomenon is observed in gate tuned spin-up current. When the coupling between quantum dot and topological superconductor is strong enough, this step will evolve into a linear relation, revealing Majorana fermion's robustness.

关键词: Majorana fermion, spin current, tunnel magnetoresistance, thermal-bias

Abstract: We investigate the spin-related currents and tunnel magnetoresistance through a quantum dot, which is side-coupled with a Majorana fermion zero mode and two thermal-driven ferromagnetic electrodes. It is found that the interplay of Majorana fermion and electrodes' spin polarization can induce a nonlinear thermal-bias spin current. This interplay also decreases the total magnitude of spin or charge current, in either parallel or antiparallel configuration. In addition, a thermal-driven negative tunnel magnetoresistance is found, which is an unique feature to characterize Majorana fermion. With large temperature difference, a step phenomenon is observed in gate tuned spin-up current. When the coupling between quantum dot and topological superconductor is strong enough, this step will evolve into a linear relation, revealing Majorana fermion's robustness.

Key words: Majorana fermion, spin current, tunnel magnetoresistance, thermal-bias

中图分类号: (Transport properties)

74.25.F-

74.25.fc (Electric and thermal conductivity) 85.75.-d (Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields) 72.25.-b (Spin polarized transport)

Peng-Bin Niu(牛鹏斌), Bo-Xiang Cui(崔博翔), and Hong-Gang Luo(罗洪刚). Negative tunnel magnetoresistance in a quantum dot induced by interplay of a Majorana fermion and thermal-driven ferromagnetic leads[J]. 中国物理B, 2021, 30(9): 97401-097401.

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Negative tunnel magnetoresistance in a quantum dot induced by interplay of a Majorana fermion and thermal-driven ferromagnetic leads

Negative tunnel magnetoresistance in a quantum dot induced by interplay of a Majorana fermion and thermal-driven ferromagnetic leads

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