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28 March 2024
 
  » arxiv » 2003.2850

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Possible superconductivity with Bogoliubov Fermi surface in lightly doped Kagome U(1) spin liquid
Yi-Fan Jiang ; Hong Yao ; Fan Yang ;
Date 5 Mar 2020
AbstractWhether the doped t-J model on the Kagome lattice supports exotic superconductivity has not been decisively answered. In this paper, we propose a new class of variational states for this model and perform 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) $pi$-flux or $0$-flux states, and energy minimization among them yields a chiral noncentrosymmetric nematic superconducting state with $2 imes 2$-enlarged unit cell. Moreover, this pair density wave state possesses a finite Fermi surface for the Bogoliubov quasi particles. We further study experimentally relevant properties of this intriguing pairing state.
Source arXiv, 2003.2850
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