Parity-time symmetry breaking in magnetic systems

Galda, Alexey; Vinokur, Valerii M.

doi:10.1103/PhysRevB.94.020408

Parity-time symmetry breaking in magnetic systems

Journal Article · Thu Jul 14 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.020408· OSTI ID:1356846

Galda, Alexey ^[1]; Vinokur, Valerii M. ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division

The understanding of out-of-equilibrium physics, especially dynamic instabilities and dynamic phase transitions, is one of the major challenges of contemporary science, spanning the broadest wealth of research areas that range from quantum optics to living organisms. By focusing on nonequilibrium dynamics of an open dissipative spin system, we introduce a non-Hermitian Hamiltonian approach, in which non-Hermiticity reflects dissipation and deviation from equilibrium. The imaginary part of the proposed spin Hamiltonian describes the effects of Gilbert damping and applied Slonczewski spin-transfer torque. In the classical limit, our approach reproduces Landau-Lifshitz-Gilbert-Slonczewski dynamics of a large macrospin. Here, we reveal the spin-transfer torque-driven parity-time symmetry-breaking phase transition corresponding to a transition from precessional to exponentially damped spin dynamics. Micromagnetic simulations for nanoscale ferromagnetic disks demonstrate the predicted effect. These findings can pave the way to a general quantitative description of out-of-equilibrium phase transitions driven by spontaneous parity-time symmetry breaking.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1356846

Alternate ID(s):: OSTI ID: 1262455

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 94; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Antiferromagnetism emerging in a ferromagnet with gain Yang, Huanhuan; Wang, C.; Yu, Tianlin arXiv https://doi.org/10.48550/arxiv.1807.01048	text	January 2018
Exceptional points in classical spin dynamics Galda, Alexey; Vinokur, Valerii M. arXiv https://doi.org/10.48550/arxiv.1903.09729	preprint	January 2019

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