Strain-induced superconducting pair density wave states in graphene

Feng Xu, Po-Hao Chou, Chung-Hou Chung, Ting-Kuo Lee, and Chung-Yu Mou
Phys. Rev. B 98, 205103 – Published 2 November 2018

Abstract

Graphene is known to be nonsuperconducting. However, surprising superconductivity is recently discovered in a flat band in a twisted bilayer graphene. Here, we show that superconductivity can be more easily realized in topological flat bands induced by strain in graphene through periodic ripples. Specifically, it is shown that by including correlation effects, the chiral d-wave superconductivity can be stabilized under strain even for slightly doped graphene. The chiral d-wave superconductivity generally coexists with charge density waves (CDW) and pair density waves (PDW) of the same period. Remarkably, a pure PDW state with doubled period that coexists with the CDW state is found to emerge at a finite-temperature region under reasonable strain strength. The emergent PDW state is shown to be superconducting with nonvanishing superfluid density, and it realizes the long-sought-after superconducting states with nonvanishing center-of-mass momentum for Cooper pairs.

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  • Received 8 August 2018
  • Revised 7 October 2018

DOI:https://doi.org/10.1103/PhysRevB.98.205103

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Feng Xu1, Po-Hao Chou2, Chung-Hou Chung3, Ting-Kuo Lee4, and Chung-Yu Mou2,4,5

  • 1School of Physics and Telecommunication Engineering, Shaanxi University of Technology, Hanzhong 723001, China
  • 2Center for Quantum Technology and Department of Physics, National Tsing Hua University, Hsinchu 30043, Taiwan, 300, Republic of China
  • 3Electrophysics Department, National Chiao-Tung University, HsinChu, Taiwan, Republic of China
  • 4Institute of Physics, Academia Sinica, Nankang 115, Taiwan, Republic of China
  • 5Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan, Republic of China

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Issue

Vol. 98, Iss. 20 — 15 November 2018

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