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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 | Abstract: | Whether 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 | Services: | Forum | Review | PDF | Favorites |
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