Refereed journal article or data article (A1)

Revealing the nature of nonequilibrium phase transitions with quantum trajectories




List of Authors: Link V, Luoma K, Strunz WT

Publisher: AMER PHYSICAL SOC

Publication year: 2019

Journal: Physical Review A

Journal name in source: PHYSICAL REVIEW A

Journal acronym: PHYS REV A

Volume number: 99

Issue number: 6

Number of pages: 7

ISSN: 2469-9926

DOI: http://dx.doi.org/10.1103/PhysRevA.99.062120


Abstract
A damped and driven collective spin system is analyzed by using quantum state diffusion. This approach allows for a mostly analytical treatment of the investigated nonequilibrium quantum many-body dynamics, which features a phase transition in the thermodynamical limit. The exact results obtained in this work, which are free of any finite-size defects, provide a complete understanding of the model. Moreover, the trajectory framework gives an intuitive picture of the two phases occurring, revealing a spontaneously broken symmetry and allowing for a qualitative and quantitative characterization of the phases. We determine exact critical exponents, investigate finite-size scaling, and explain a remarkable nonalgebraic behavior at the transition in terms of torus hopping.


Last updated on 2022-04-03 at 12:40