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Controllable spin pairing states in silicene-based superconducting hybrid structures with noncollinear magnetizations

Yajun Wei1, Tinmin Liu1, Chuanshuai Huang1, Y. C. Tao1,*, and Fenghua Qi2,†

  • 1Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023, China
  • 2School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing 211171, China

  • *yctao88@163.com
  • †qifenghua.hi@163.com
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Phys. Rev. Research 3, 033131 – Published 9 August, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.033131

Abstract

We have theoretically investigated the modulation between the opposite- and equal-spin pairings and the related transport properties in silicene-based ferromagnet/ferromagnet/superconductor hybrid structures with noncollinear magnetizations. Due to the exotic electronic properties of silicene, the exclusive fully spin-polarized equal-spin pairing state appears without any contamination from the opposite-spin pairing state in a perpendicular magnetic configuration. Furthermore, the switch effect between fully spin-polarized opposite- and equal-spin pairings can be realized by tuning the Fermi level. In addition, the fully spin-polarized equal-spin pairing correlation can be enhanced by modulation of the magnitude and orientation of the exchange field in the central region. It is also a significant finding that for the formation of the fully spin-polarized equal-spin pairing state, the length of the central layer can be taken to be large, but not for opposite-spin pairing. Our findings provide an ideal platform to explore fully spin-polarized opposite- and equal-spin pairing states separately.

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Phys. Rev. Research 3, 033131– Published 9 August, 2021
  • Received 27 May 2021
  • Revised 18 July 2021
  • Accepted 20 July 2021
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