Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102901
Title: Level attraction and exceptional points in a resonant spin-orbit torque system
Authors: Proskurin, I.
Stamps, R. L.
Issue Date: 2021
Publisher: American Physical Society
Citation: Proskurin I. Level attraction and exceptional points in a resonant spin-orbit torque system / I. Proskurin, R. L. Stamps. — DOI 10.1103/PhysRevB.103.195409 // Physical Review B. — 2021. — Vol. 103. — Iss. 19. — 195409.
Abstract: Level attraction can appear in driven systems where instead of repulsion, two modes coalesce in a region separated by two exceptional points. This behavior was proposed for optomechanical and optomagnonic systems, and recently it was observed for dissipative cavity magnon-polaritons. We demonstrate that such a regime exists in a spin-orbit torque system where a magnetic oscillator is resonantly coupled to an electron reservoir. An instability mechanism necessary for mode attraction can be provided by applying an electric field. The field excites interband transitions between spin-orbit split bands leading to an instability of the magnetic oscillator. Two exceptional points then appear in the oscillator energy spectrum and the region of instability. We discuss conditions under which this can occur, and we estimate the electric field strength necessary for reaching the attraction region for a spin-orbit torque oscillator with Rashba coupling. A proposal for experimental detection is made using magnetic susceptibility measurements. © 2021 American Physical Society.
Keywords: ELECTRIC FIELDS
MAGNETIC SUSCEPTIBILITY
MAGNETISM
SPIN ORBIT COUPLING
DISSIPATIVE CAVITIES
ELECTRIC FIELD STRENGTH
ELECTRON RESERVOIR
EXCEPTIONAL POINTS
INSTABILITY MECHANISMS
INTER-BAND TRANSITION
MAGNETIC OSCILLATOR
MAGNETIC SUSCEPTIBILITY MEASUREMENTS
SPIN FLUCTUATIONS
URI: http://hdl.handle.net/10995/102901
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85106246413
PURE ID: 22121632
e3185ff3-ee3c-4a09-89a8-b60d31960b4e
ISSN: 24699950
DOI: 10.1103/PhysRevB.103.195409
metadata.dc.description.sponsorship: I.P. and R.L.S. acknowledge the support of the Natural Sciences and Engineering Research Council of Canada (NSERC) RGPIN 05011-18.
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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