Possible superconductivity with Bogoliubov Fermi surface in lightly doped Kagome U(1) spin liquid

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 $2\times 2$-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.

4.5 pages, 3 figures + supplement material. To appear in Phys. Rev. Lett

References in corpus (21)

• Theory of Intertwined Orders in High Temperature Superconductors
• Identifying Topological Order by Entanglement Entropy
• Projected wavefunction study of Spin-1/2 Heisenberg model on the Kagome lattice
• Fractionalized Fermi liquids
• Striped superconductors: How the cuprates intertwine spin, charge and superconducting orders
• Dynamical layer decoupling in a stripe-ordered, high T_c superconductor
• Charge $4e$ superconductivity from pair density wave order in certain high temperature superconductors
• Ground State of the Kagome Lattice Heisenberg Antiferromagnet
• Dislocations and vortices in pair density wave superconductors
• Bogoliubov Fermi surfaces in superconductors with broken time-reversal symmetry
• Global Phase Diagram of Competing Ordered and Quantum Spin Liquid Phases on the Kagomé Lattice
• Amperean Pairing Instability in the U(1) Spin Liquid State with Fermi Surface and Application to $\kappa -(BEDT-TTF{)}_{2}C{u}_2(CN{)}_3$
• Emergent space-time supersymmetry in 3D Weyl and 2D Dirac semimetals
• Pair Density Wave correlations in the Kondo-Heisenberg Model
• Triplet and Singlet Excitations in the Valence Bond Crystal Phase of Kagome Lattice Heisenberg Model
• Inflated nodes and surface states in superconducting half-Heusler compounds
• Visualizing the periodic modulation of Cooper pairing in a severely underdoped cuprate
• Strong Coupling Limit of the Holstein-Hubbard Model
• Topological superconductivity in the doped chiral spin liquid on the triangular lattice
• Gapless Spin Liquids: Stability and Possible Experimental Relevance
• On the Origin of the Tunneling Asymmetry in the Cuprate Superconductors: a variational perspective

Cited by in corpus (4)

• Doping the chiral spin liquid -- topological superconductor or chiral metal?
• Bogoliubov Fermi Surfaces in Spin-1/2 Systems: Model Hamiltonians and Experimental Consequences
• Quantum Phase Diagram and Spontaneously Emergent Topological Chiral Superconductivity in Doped Triangular-Lattice Mott Insulators
• Pair density wave facilitated by Bloch quantum geometry in nearly flat band multiorbital superconductors