Negative Temperature States in the Discrete Nonlinear Schroedinger Equation
Pattern Formation and Solitons
2015-06-04 v1 Quantum Gases
Abstract
We explore the statistical behavior of the discrete nonlinear Schroedinger equation. We find a parameter region where the system evolves towards a state characterized by a finite density of breathers and a negative temperature. Such a state is metastable but the convergence to equilibrium occurs on astronomical time scales and becomes increasingly slower as a result of a coarsening processes. Stationary negative-temperature states can be experimentally generated via boundary dissipation or from free expansions of wave packets initially at positive temperature equilibrium.
Cite
@article{arxiv.1203.4162,
title = {Negative Temperature States in the Discrete Nonlinear Schroedinger Equation},
author = {S. Iubini and R. Franzosi and R. Livi and G. -L. Oppo and A. Politi},
journal= {arXiv preprint arXiv:1203.4162},
year = {2015}
}
Comments
4 pages, 5 figures