Non-equilibrium properties of the S=1/2 Heisenberg model in a time-dependent magnetic field
arXiv:cond-mat/0305139 · doi:10.1016/S0378-4371(03)00478-3
Abstract
The time-dependent behavior of the Heisenberg model in contact with a phonon heat bath and in an external time-dependent magnetic field is studied by means of a path integral approach. The action of the phonon heat bath is taken into account up to the second order in the coupling to the heath bath. It is shown that there is a minimal value of the magnetic field below which the average magnetization of the system does not relax to equilibrium when the external magnetic field is flipped. This result is in qualitative agreement with the mean field results obtained within -theory.
arXiv commentTo be published in Physica A
References in corpus (9)
- Theory of the spin bath
- Fokker-Planck and Landau-Lifshitz-Bloch Equations for Classical Ferromagnets
- Low-Temperature Quantum Relaxation in a System of Magnetic Nanomolecules
- Non-Equilibrium Quantum Fields in the Large N Expansion
- Finite Temperature Time-Dependent Effective Theory for the Phase Field in two-dimensional d-wave Neutral Superconductor
- Finite Temperature Time-Dependent Effective Theory For The Goldstone Field In A BCS-Type Superfluid
- Effective action approach and Carlson-Goldman mode in d-wave superconductors
- Out of Equilibrium Non-perturbative Quantum Field Dynamics in Homogeneous External Fields
- Non-equilibrium dynamics in quantum field theory at high density: the tsunami