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Title: Parity-time symmetry breaking in spin chains

Abstract

We investigate nonequilibrium phase transitions in classical Heisenberg spin chains associated with spontaneous breaking of parity-time (PT) symmetry of the system under the action of Slonczewski spin-transfer torque (STT) modeled by an applied imaginary magnetic field. We reveal the STT-driven PT symmetry-breaking phase transition between the regimes of precessional and exponentially damped spin dynamics and show that its several properties can be derived from the distribution of zeros of the system's partition function, the approach first introduced by Yang and Lee for studying equilibrium phase transitions in Ising spin chains. The physical interpretation of imaginary magnetic field as describing the action of nonconservative forces opens the possibility of direct observations of Lee-Yang zeros in nonequilibrium physical systems.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1455047
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 97; Journal Issue: 20
Country of Publication:
United States
Language:
English

Citation Formats

Galda, Alexey, and Vinokur, Valerii M. Parity-time symmetry breaking in spin chains. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.201411.
Galda, Alexey, & Vinokur, Valerii M. Parity-time symmetry breaking in spin chains. United States. doi:10.1103/PhysRevB.97.201411.
Galda, Alexey, and Vinokur, Valerii M. Tue . "Parity-time symmetry breaking in spin chains". United States. doi:10.1103/PhysRevB.97.201411.
@article{osti_1455047,
title = {Parity-time symmetry breaking in spin chains},
author = {Galda, Alexey and Vinokur, Valerii M.},
abstractNote = {We investigate nonequilibrium phase transitions in classical Heisenberg spin chains associated with spontaneous breaking of parity-time (PT) symmetry of the system under the action of Slonczewski spin-transfer torque (STT) modeled by an applied imaginary magnetic field. We reveal the STT-driven PT symmetry-breaking phase transition between the regimes of precessional and exponentially damped spin dynamics and show that its several properties can be derived from the distribution of zeros of the system's partition function, the approach first introduced by Yang and Lee for studying equilibrium phase transitions in Ising spin chains. The physical interpretation of imaginary magnetic field as describing the action of nonconservative forces opens the possibility of direct observations of Lee-Yang zeros in nonequilibrium physical systems.},
doi = {10.1103/PhysRevB.97.201411},
journal = {Physical Review B},
number = 20,
volume = 97,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2018},
month = {Tue May 01 00:00:00 EDT 2018}
}