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Chin. Phys. B, 2021, Vol. 30(9): 097401    DOI: 10.1088/1674-1056/abf10b
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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
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.
Keywords:  Majorana fermion      spin current      tunnel magnetoresistance      thermal-bias  
Received:  18 January 2021      Revised:  23 February 2021      Accepted manuscript online:  23 March 2021
PACS:  74.25.F- (Transport properties)  
  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)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11834005 and 11674139).
Corresponding Authors:  Peng-Bin Niu     E-mail:  niupengbin@163.com

Cite this article: 

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 2021 Chin. Phys. B 30 097401

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