| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 |
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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.
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Received: 18 January 2021
Revised: 23 February 2021
Accepted manuscript online: 23 March 2021
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PACS:
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74.25.F-
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(Transport properties)
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74.25.fc
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(Electric and thermal conductivity)
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85.75.-d
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(Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)
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72.25.-b
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(Spin polarized transport)
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| 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
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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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