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28 March 2024
 
  » arxiv » cond-mat/0509624

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Resonating plaquette phase of a quantum six-vertex model
Olav F. Syljuasen ; Sudip Chakravarty ;
Date 24 Sep 2005
Subject Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el
AbstractThe 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 quantum fluctuations of its order parameter. The inferred finite temperature phase diagram contains unsuspected multicritical points.
Source arXiv, cond-mat/0509624
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