Finite-size scaling in the quantum phase transition of the open-system Dicke-model
Quantum Physics
2014-08-25 v1 Quantum Gases
Abstract
Laser-driven Bose-Einstein condensate of ultracold atoms loaded into a lossy high-finesse optical resonator exhibits critical behavior and, in the thermodynamic limit, a phase transition between stationary states of different symmetries. The system realizes an open-system variant of the celebrated Dicke-model. We study the transition for a finite number of atoms by means of a Hartree-Fock-Bogoliubov method adapted to a damped-driven open system. The finite-size scaling exponents are determined and a clear distinction between the non-equilibrium and the equilibrium quantum criticality is found.
Keywords
Cite
@article{arxiv.1206.5131,
title = {Finite-size scaling in the quantum phase transition of the open-system Dicke-model},
author = {G. Konya and D. Nagy and G. Szirmai and P. Domokos},
journal= {arXiv preprint arXiv:1206.5131},
year = {2014}
}