4.6 Article

Superfluid weight and Berezinskii-Kosterlitz-Thouless transition temperature of strained graphene

期刊

CHINESE JOURNAL OF PHYSICS
卷 70, 期 -, 页码 288-296

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ELSEVIER
DOI: 10.1016/j.cjph.2021.01.009

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资金

  1. National Science Foundation of China [11804213]
  2. Shaanxi Provincial Education Department [20JK0573]
  3. Scientific Research Foundation of Shaanxi University of Technology [SLGRCQD2006]
  4. Natural Science Basic Research Program of Shaanxi [2019JM213]
  5. Ministry of Science and Technology (MoST), Taiwan
  6. Center for Quantum Technology within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan

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The study demonstrates that flat-band superconductivity in strained graphene can significantly increase the superconducting transition temperature, while the superfluid weight of pure superconducting pair-density-wave states exhibits a transition temperature much lower than the pair density wave gap-opening temperature.
We obtain the superfluid weight and Berezinskii-Kosterlitz-Thouless (BKT) transition temperature for highly unconventional superconducting states with the coexistence of chiral d-wave superconductivity, charge density waves and pair density waves in the strained graphene. Our results show that the strain-induced flat bands can promote the superconducting transition temperature approximately 50% compared to that of the original doped graphene, which suggests that the flat-band superconductivity is a potential route to get superconductivity with higher critical temperatures. In particular, we obtain the superfluid weight for the pure superconducting pair-density-wave states from which the deduced superconducting transition temperature is shown to be much lower than the gap-opening temperature of the pair density wave, which is helpful to understand the phenomenon of the pseudogap state in high-T-c cuprate superconductors. Finally, we show that the BKT transition temperature versus doping for strained graphene exhibits a dome-like shape and it depends linearly on the spin-spin interaction strength.

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