A1 Refereed original research article in a scientific journal
Revealing the nature of nonequilibrium phase transitions with quantum trajectories
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
Article number: ARTN 062120
Volume: 99
Issue: 6
Number of pages: 7
ISSN: 2469-9926
DOI: https://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.
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.
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