Floquet Weyl Magnons in Three-Dimensional Quantum Magnets

In three-dimensional (3D) quantum magnets, magnonic Weyl points (WPs) featuring linear band crossing of two non-degenerate magnon branches can emerge in certain lattice geometry when time-reversal symmetry is broken macroscopically. Unfortunately, there are very limited 3D quantum magnets that host...

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Veröffentlicht in:Scientific reports 2018-07, Vol.8 (1), p.10098-10, Article 10098
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description In three-dimensional (3D) quantum magnets, magnonic Weyl points (WPs) featuring linear band crossing of two non-degenerate magnon branches can emerge in certain lattice geometry when time-reversal symmetry is broken macroscopically. Unfortunately, there are very limited 3D quantum magnets that host magnonic WPs, and they are yet to be observed experimentally because the intrinsic perturbative interactions that break time-reversal symmetry macroscopically can be very negligible. Here, we present an alternative means via photo-irradiation, in which magnonic WPs can emerge in 3D quantum magnets without relying on intrinsic perturbative interactions to break time-reversal symmetry. By utilizing the magnonic Floquet-Bloch theory, we put forward the general theory of magnonic Floquet WPs in 3D quantum magnets. We show that periodically driven 3D magnonic Dirac nodal-line (DNL) and 3D magnonic gapped trivial insulators can generate 3D magnonic Floquet WPs, which can be tuned by the incident circularly-polarized light. We demonstrate the existence of magnonic Floquet WPs by combining the study of the magnon dispersions, Berry curvatures, and the anomalous thermal Hall effect. The general theoretical formalism can be applied to different magnetic insulators, and thus extending the concept of magnonic WPs to a broader class of 3D magnetically ordered systems.
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A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Floquet Weyl Magnons in Three-Dimensional Quantum Magnets</atitle><jtitle>Scientific reports</jtitle><stitle>Sci Rep</stitle><addtitle>Sci Rep</addtitle><date>2018-07-04</date><risdate>2018</risdate><volume>8</volume><issue>1</issue><spage>10098</spage><epage>10</epage><pages>10098-10</pages><artnum>10098</artnum><issn>2045-2322</issn><eissn>2045-2322</eissn><abstract>In three-dimensional (3D) quantum magnets, magnonic Weyl points (WPs) featuring linear band crossing of two non-degenerate magnon branches can emerge in certain lattice geometry when time-reversal symmetry is broken macroscopically. Unfortunately, there are very limited 3D quantum magnets that host magnonic WPs, and they are yet to be observed experimentally because the intrinsic perturbative interactions that break time-reversal symmetry macroscopically can be very negligible. 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subjects 639/766/119/1001
639/766/119/997
Humanities and Social Sciences
multidisciplinary
Polarized light
Radiation
Science
Science (multidisciplinary)
Symmetry
title Floquet Weyl Magnons in Three-Dimensional Quantum Magnets
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