Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-11-02
Phys. Rev. B 84, 180503(R) (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 2 figures. Accepted for publication in Phys. Rev. B Rapid Communications
Scientific paper
10.1103/PhysRevB.84.180503
We present large-scale Monte Carlo results for the dynamical critical exponent z and the spatio-temporal two-point correlation function of a (2+1)-dimensional quantum XY model with bond dissipation, proposed to describe a quantum critical point in high-Tc cuprates near optimal doping. The phase variables of the model, originating with a parametrization of circulating currents within the CuO_2 unit cells in cuprates, are compact, {\theta_{r,\tau}} \in [-\pi,\pi>. The dynamical critical exponent is found to be z \approx 1, and the spatio-temporal correlation functions are explicitly demonstrated to be isotropic in space-imaginary time. The model thus has a fluctuation spectrum where momentum and frequency enter on equal footing, rather than having the essentially momentum-independent marginal Fermi liquid-like fluctuation spectrum previously reported for the same model.
Sperstad Iver Bakken
Stiansen Einar B.
Sudbø Asle
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