Possible Superconductivity with a Bogoliubov Fermi Surface in a Lightly Doped Kagome U(1) Spin Liquid

Yi-Fan Jiang, Hong Yao, and Fan Yang
Phys. Rev. Lett. 127, 187003 – Published 26 October 2021
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Abstract

Whether the doped t-J model on the Kagome lattice supports exotic superconductivity has not been decisively answered. In this Letter, we propose a new class of variational states for this model and perform a large-scale variational Monte Carlo simulation on it. The proposed variational states are parameterized by the SU(2)-gauge rotation angles, as the SU(2)-gauge structure hidden in the Gutzwiller-projected mean-field Ansatz for the undoped model is broken upon doping. These variational doped states smoothly connect to the previously studied U(1) π-flux or 0-flux states, and energy minimization among them yields a chiral noncentrosymmetric nematic superconducting state with 2×2-enlarged unit cell. Moreover, this pair density wave state possesses a finite Fermi surface for the Bogoliubov quasiparticles. We further study experimentally relevant properties of this intriguing pairing state.

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  • Received 3 May 2020
  • Revised 22 May 2021
  • Accepted 30 September 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.187003

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yi-Fan Jiang1,2, Hong Yao3,4,5,*, and Fan Yang6,†

  • 1School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
  • 2Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, California 94025, USA
  • 3Institute of Advanced Study, Tsinghua University, Beijing 100084, China
  • 4State Key Laboratory of Low Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
  • 5Department of Physics, Stanford University, Stanford, California 94305, USA
  • 6School of Physics, Beijing Institute of Technology, Beijing 100081, China

  • *Corresponding author. yaohong@tsinghua.edu.cn
  • Corresponding author. yangfan_blg@bit.edu.cn

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Issue

Vol. 127, Iss. 18 — 29 October 2021

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