Path-integral centroid methods in quantum statistical mechanics and dynamics Page 149
PATH-INTEGRAL CENTROID METHODS IN QUANTUM STATISTICAL MECHANICS AND …

We address estimation of temperature for finite quantum systems at thermal equilibrium and
show that the Landau bound to precision $\delta {T}^{2}\propto {T}^{2} $, originally derived …

An overview on the theoretic formalism and up to date applications in quantum condensed
matter physics of the effective potential and effective Hamiltonian methods is given. The …

Abstract Results of Monte Carlo simulations of the ferromagnetic classical XXZ model on a
square lattice are reported for interactions of the out of plane spin components λ varying …

We use a generalized spin-wave approach and large-scale quantum Monte Carlo (QMC)
simulations to study the quantum phase diagram and quasiparticle excitations of the S= 1 …

The quantum Heisenberg antiferromagnet (HAF) is approached by the pure-quantum self-
consistent harmonic approximation that reduces it to an effective classical HAF model. The …

The quantum easy-plane ferromagnetic two-dimensional XXZ model is approached by the
pure-quantum self-consistent harmonic approximation that reduces it to an effective classical …

The classical XXZ triangular-lattice antiferromagnet shows both an Ising and a Berezinskii-
Kosterlitz-Thouless transition, related to the chirality and the in-plane spin components …

We propose a new quantum dynamics method called the effective potential analytic
continuation (EPAC) to calculate the real time quantum correlation functions at finite …

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