Complex Wave Function, Chiral Spin Order Parameter and Phase Problem

Complex wave function , Chiral spin order parameter and Phase Problem

We study the two dimensional Hubbard model by use of the ground state algorithm in the Monte Carlo simulation. We employ complex wave functions as trial function in order to have a close look at properties such as chiral spin order (χSO) and flux phase. For half filling, a particle-hole transformation leads to sum rules with respect to the Green’s functions for a certain choice of a set of wave...

Spin-wave theory at constant order parameter

We derive the low-temperature properties of spin-S quantum Heisenberg magnets from the Gibbs free energy G(M ) for fixed order parameter M. Assuming that the low-lying elementary excitations of the system are renormalized spin waves, we show that a straightforward 1/S expansion of G(M ) yields qualitatively correct results for the low-temperature thermodynamics, even in the absence of long-rang...

Relationship between the elastic properties and the order parameter of the spin-density wave phase of (TMTSF)2PF6

Chiral p-wave order in Sr2RuO4.

Shortly after the discovery in 1994 of superconductivity in Sr(2)RuO(4), it was proposed on theoretical grounds that the superconducting state may have chiral p-wave symmetry analogous to the A phase of superfluid (3)He. Substantial experimental evidence has since accumulated in favor of this pairing symmetry, including several interesting recent results related to broken time-reversal symmetry...

Semion wave function and energetics in a chiral spin liquid on the Kagome lattice

Recent years have seen the discovery of a chiral spin liquid state – a bosonic analogue of a fractional Quantum Hall state first put forward by Kalmeyer and Laughlin in 1987 – in several deformations of the Heisenberg model on the Kagome lattice. Here, we apply state-of-the-art numerical techniques to one such model, where breaking of the time-reversal symmetry drives the system into the chiral...