Andreev conductance in the d+id′-wave superconducting states of graphene
Yongjin Jiang, Dao-Xin Yao, Erica W. Carlson, Han-Dong Chen, JiangPing Hu
DOI 10.1103/PhysRevB.77.235420 · Physical Review B
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Abstract
We show that effective superconducting orders generally emerge at low energy in the superconducting state of graphene with conventionally defined pairing symmetry. We study a particular interesting example, the dx2−y2+idxy′ spin singlet pairing state in graphene which can be generated by electronic correlation. We find that effectively the d+id′-wave state is a state with mixed s-wave and exotic p+ip-wave pairing orders at low energy. This remarkable property leads to distinctive superconducting gap functions and behavior of the Andreev conductance spectra through a normal/superconducting graphene structure.
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