Enhancement of subgap conductance in a graphene superconductor junction by valley polarization

doi:10.1088/1674-1056/26/2/027304

Abstract We theoretically study the differential conductance of a graphene/graphene superconductor junction, where the valley polarization of Dirac electrons is considered in the nonsuperconducting region. It is shown that the subgap conductance will increase monotonically with the valley-polarization strength when the chemical potential μ is near the Dirac point μ≤3Δ (Δ is the superconducting gap), whereas it will decrease monotonically when μ is far away from the Dirac point, μ≥5Δ. The former case is induced by the specular Andreev reflection while the retro-reflection accounts for the later result. Our findings may shed light on the control of conductance of a graphene superconductor junction by valley polarization.

Keywords: graphene valley polarization subgap conductance specular Andreev reflection

Received: 28 April 2016
Revised: 31 October 2016
Accepted manuscript online:

PACS:	73.40.Gk	(Tunneling)
	73.23.Ad	(Ballistic transport)
	85.25.-j	(Superconducting devices)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11274059 and 11074233).

Corresponding Authors: Jun Wang
E-mail: jwang@seu.edu.cn

Cite this article:

Chuan-Xin Li(李传新), Sa-Ke Wang(汪萨克), Jun Wang(汪军) Enhancement of subgap conductance in a graphene superconductor junction by valley polarization 2017 Chin. Phys. B 26 027304

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Enhancement of subgap conductance in a graphene superconductor junction by valley polarization

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