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Exceptional points in classical spin dynamics
Non-conservative physical systems admit a special kind of spectral degeneracy, known as exceptional point (EP), at which eigenvalues and eigenvectors of the corresponding non-Hermitian Hamiltonian coalesce. Dynamical parametric encircling of the EP can lead to non-adiabatic evolution associated with...
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| Published in: | Scientific reports 2019-11, Vol.9 (1), p.17484-7, Article 17484 |
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| creator | Galda, Alexey Vinokur, Valerii M. |
| description | Non-conservative physical systems admit a special kind of spectral degeneracy, known as exceptional point (EP), at which eigenvalues and eigenvectors of the corresponding non-Hermitian Hamiltonian coalesce. Dynamical parametric encircling of the EP can lead to non-adiabatic evolution associated with a state flip, a sharp transition between the resonant modes. Physical consequences of the dynamical encircling of EPs in open dissipative systems have been explored in optics and photonics. Building on the recent progress in understanding the parity-time (
P
T
)-symmetric dynamics in spin systems, we use topological properties of EPs to implement chiral non-reciprocal transmission of a spin through the material with non-uniform magnetization, like helical magnet. We consider an exemplary system, spin-torque-driven single spin described by the time-dependent non-Hermitian Hamiltonian. We show that encircling individual EPs in a parameter space results in non-reciprocal spin dynamics and find the range of optimal protocol parameters for high-efficiency asymmetric spin filter based on this effect. Our findings offer a platform for non-reciprocal spin devices for spintronics and magnonics. |
| doi_str_mv | 10.1038/s41598-019-53455-0 |
| format | article |
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P
T
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P
T
)-symmetric dynamics in spin systems, we use topological properties of EPs to implement chiral non-reciprocal transmission of a spin through the material with non-uniform magnetization, like helical magnet. We consider an exemplary system, spin-torque-driven single spin described by the time-dependent non-Hermitian Hamiltonian. We show that encircling individual EPs in a parameter space results in non-reciprocal spin dynamics and find the range of optimal protocol parameters for high-efficiency asymmetric spin filter based on this effect. 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(ANL), Argonne, IL (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Exceptional points in classical spin dynamics</atitle><jtitle>Scientific reports</jtitle><stitle>Sci Rep</stitle><addtitle>Sci Rep</addtitle><date>2019-11-25</date><risdate>2019</risdate><volume>9</volume><issue>1</issue><spage>17484</spage><epage>7</epage><pages>17484-7</pages><artnum>17484</artnum><issn>2045-2322</issn><eissn>2045-2322</eissn><abstract>Non-conservative physical systems admit a special kind of spectral degeneracy, known as exceptional point (EP), at which eigenvalues and eigenvectors of the corresponding non-Hermitian Hamiltonian coalesce. Dynamical parametric encircling of the EP can lead to non-adiabatic evolution associated with a state flip, a sharp transition between the resonant modes. Physical consequences of the dynamical encircling of EPs in open dissipative systems have been explored in optics and photonics. 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P
T
)-symmetric dynamics in spin systems, we use topological properties of EPs to implement chiral non-reciprocal transmission of a spin through the material with non-uniform magnetization, like helical magnet. We consider an exemplary system, spin-torque-driven single spin described by the time-dependent non-Hermitian Hamiltonian. We show that encircling individual EPs in a parameter space results in non-reciprocal spin dynamics and find the range of optimal protocol parameters for high-efficiency asymmetric spin filter based on this effect. Our findings offer a platform for non-reciprocal spin devices for spintronics and magnonics.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>31767882</pmid><doi>10.1038/s41598-019-53455-0</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0002-0977-3515</orcidid><orcidid>https://orcid.org/0000000209773515</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | 639/301/119/2793 639/766/119/1001 Adiabatic Asymmetry Efficiency Eigenvalues Humanities and Social Sciences Magnetic fields MATERIALS SCIENCE multidisciplinary Optics Phase transitions Protocol Science Science (multidisciplinary) Symmetry |
| title | Exceptional points in classical spin dynamics |
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