Unconventional chiral d-wave superconducting state in strained graphene

doi:10.1088/1674-1056/ab478c

Abstract We consider a highly unconventional superconducting state with chiral d-wave symmetry in doped graphene under strain with the Gutzwiller-RVB method in the momentum space. It is shown that flat bands emerge in the normal state for reasonable strain. As a result, the superconducting critical temperature is found to be linearly proportional to the strength of the electron-electron interaction. Furthermore, the chiral d-wave superconducting state is shown with coexistence of the charge density wave and the pair density wave. There are different coexisting states with those orders under different doping levels.

Keywords: chiral d-wave superconducting state pair density wave flat band doped graphene

Received: 25 February 2019
Revised: 23 September 2019
Accepted manuscript online:

PACS:	74.70.Wz	(Carbon-based superconductors)
	74.72.Kf	(Pseudogap regime)
	74.72.Ek	(Electron-doped)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11804213 and 11605109).

Corresponding Authors: Feng Xu
E-mail: xufengxlx@snut.edu.cn

Cite this article:

Feng Xu(徐峰), Lei Zhang(张磊) Unconventional chiral d-wave superconducting state in strained graphene 2019 Chin. Phys. B 28 117403

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