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Chin. Phys. B, 2022, Vol. 31(12): 127301    DOI: 10.1088/1674-1056/ac989e

Spin transport properties in ferromagnet/superconductor junctions on topological insulator

Hong Li(李红) and Xin-Jian Yang(杨新建)
College of Science, China University of Petroleum, Qingdao 266580, China
Abstract  The spin-dependent Andreev reflection is investigated theoretically by analyzing the electronic transport in a thin-film topological insulator (TI) ferromagnet/superconductor (FM/SC) junction. The tunneling conductance and shot noise are calculated based on the Dirac-Bogoliubov-de Gennes equation and Blonder-Tinkham-Klapwijk theory. It is found that the magnetic gap in ferromagnet can enhance the Andreev retro-reflection but suppress the specular Andreev reflection. The gate potential applied to the electrode on top of superconductor can enhance the two types of reflections. There is a transition between the two types of reflections at which both the tunneling conductance and differential shot noise become zero. These results provide a method to realize and detect experimentally the intra-band specular Andreev reflection in thin film TI-based FM/SC structures.
Keywords:  TI-based FM/SC junctions      magnetic gap effect      Andreev retro-reflection      specular Andreev reflection  
Received:  28 August 2022      Revised:  30 September 2022      Accepted manuscript online:  10 October 2022
PACS:  73.43.Jn (Tunneling)  
  74.45.+c (Proximity effects; Andreev reflection; SN and SNS junctions)  
Corresponding Authors:  Hong Li     E-mail:

Cite this article: 

Hong Li(李红) and Xin-Jian Yang(杨新建) Spin transport properties in ferromagnet/superconductor junctions on topological insulator 2022 Chin. Phys. B 31 127301

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