Physics – Condensed Matter – Superconductivity
Scientific paper
2005-09-24
Phys. Rev. Lett. 96, 147004 (2006)
Physics
Condensed Matter
Superconductivity
RevTex4, 4 pages, 6 figures. Some sentences are made more precise
Scientific paper
10.1103/PhysRevLett.96.147004
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.
Chakravarty Sudip
Syljuasen Olav F.
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