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Bipolar spin-conversion diode and quantum entanglement induced by the valley and pseudoparity mixing

Mengyao Li1, Ning Bu1, Jingguo Hu3, Yongchun Tao1,*, Hao Fu1,2,†, and Jun Wang4,‡

  • 1Department of Physics, Nanjing Normal University, Nanjing 210023, China
  • 2School of Mathematical Sciences, Nanjing Normal University, Nanjing, 210023, China
  • 3Department of Physics, Yangzhou University, Yangzhou 225009, China
  • 4Department of Physics, Southeast University, Nanjing 210096, China

  • *yctao88@163.com
  • †161002003@njnu.edu.cn
  • ‡jwang@seu.edu.cn
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Phys. Rev. Research 4, 043078 – Published 4 November, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.043078

Abstract

Herein, we report on a zigzag graphene superconducting junction with a superconductor sandwiched in between two magnetized zigzag graphene nanoribbons, where the valley and pseudoparity mixing are shown to bring about peculiar properties. We find that the bipolar spin diode and spin-conversion diode in the ferromagnetic configuration as well as quantum entanglement in the antiferromagnetic one are exhibited. The noncollinear angle combined with the valley and pseudoparity mixing in arbitrary magnetic configurations exerts a significant influence on the transport properties. In addition, not only the bipolar spin diode and magnetic storage with high efficiencies but also the bipolar spin-conversion diode and quantum entanglement can coexist in one setup. Particularly, the bipolar spin-conversion diode can be used to directly detect and confirm the helical spin texture of the edge state in a quantum spin Hall insulator.

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Phys. Rev. Research 4, 043078– Published 4 November, 2022
  • Received 16 July 2022
  • Revised 7 October 2022
  • Accepted 10 October 2022
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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