Resonating plaquette phase of a quantum six-vertex model

Abstract

The simplest quantum generalization of the six-vertex model describes fluctuations of the order parameter of the d-density wave (DDW), believed to compete with superconductivity in the high-Tc superconductors. The ground state of this model undergoes a first order transition from the DDW phase to a resonating plaquette phase as the quantum fluctuations are increased, which is explored with the help of quantum Monte Carlo simulations and analytic considerations involving the n-vector (n=2) model with cubic anisotropy. In addition to finding a new quantum state, we show that the DDW is robust against a class of quantum fluctuations of its order parameter. The inferred finite temperature phase diagram contains unsuspected multicritical points.

RevTex4, 4 pages, 6 figures. Some sentences are made more precise

References in corpus (2)

• Topological Order and Conformal Quantum Critical Points
• Cyclic exchange, isolated states and spinon deconfinement in an XXZ Heisenberg model on the checkerboard lattice

Cited by in corpus (9)

• Ultrashort Lifetime Expansion for Indirect Resonant Inelastic X-ray Scattering
• Diamagnetism of nodal fermions
• Correlated Fermions on a Checkerboard Lattice
• Doped Singlet-Pair Crystal in the Hubbard model on the checkerboard lattice
• Fermionic quantum dimer and fully-packed loop models on the square lattice
• Coupled Fredkin and Motzkin chains from quantum six- and nineteen-vertex models
• Classical fully-packed loop model with attractive interactions on the square lattice
• Crystalline phases and devil's staircase in qubit spin ice
• Entanglement and its applications in systems with many degrees of freedom