Magnons and magnetic fluctuations in atomically thin MnBi2Te4

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dc.creatorLujan, David
dc.creatorChoe, Jeongheon
dc.creatorRodriguez-Vega, Martin
dc.creatorYe, Zhipeng
dc.creatorLeonardo, Aritz
dc.creatorNunley, T, Nathan
dc.creatorChang, Liang-Juan
dc.creatorLee, Shang-Fan
dc.creatorYan, Jiaqiang
dc.creatorFiete, Gregory A.
dc.creatorHe, Rui
dc.creatorLi, Xiaoqin
dc.date.accessioned2024-02-12T13:47:27Z
dc.date.available2024-02-12T13:47:27Z
dc.date.issued2022-05-09
dc.description.abstractElectron band topology is combined with intrinsic magnetic orders in MnBi2Te4, leading to novel quantum phases. Here we investigate collective spin excitations (i.e. magnons) and spin fluctuations in atomically thin MnBi2Te4 flakes using Raman spectroscopy. In a two- septuple layer with non-trivial topology, magnon characteristics evolve as an external mag- netic field tunes the ground state through three ordered phases: antiferromagnet, canted antiferromagnet, and ferromagnet. The Raman selection rules are determined by both the crystal symmetry and magnetic order while the magnon energy is determined by different interaction terms. Using non-interacting spin-wave theory, we extract the spin-wave gap at zero magnetic field, an anisotropy energy, and interlayer exchange in bilayers. We also find magnetic fluctuations increase with reduced thickness, which may contribute to a less robust magnetic order in single layers.
dc.description.departmentCenter for Dynamics and Control of Materials
dc.description.sponsorshipThis research was primarily supported by the National Science Foundation through the Center for Dynamics and Control of Materials: an NSF MRSEC under Cooperative Agreement No. DMR-1720595, which also supported the facility used in sample pre- paration. Additional support from NSF DMR-1949701 and DMR-2114825 is gratefully acknowledged by G.A.F. This work was performed in part at the Aspen Center for Physics, which is supported by the National Science Foundation grant PHY-1607611. A.L. acknowledges support from the funding grant: PID2019-105488GB-I00. Z.Y. and R.H. acknowledge support by the NSF CAREER Grant No. DMR-1760668 and NSF Grant No. DMR-2104036. X.L. gratefully acknowledges the Welch Foundation grant F-1662 for support in sample preparation. Work at ORNL was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. M. R-V. was supported by LANL LDRD Program and by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, Condensed Matter Theory Program. L.-J.C. and S.-F.L. were pri- marily funded by the Ministry of Science and Technology 105-2112-M-001-031-MY3 in Taiwan, and the collaboration with UT-Austin is facilitated by the Air Force Office of Scientific Research under award number FA2386-21-1-4067. Partial funding for L.-J.C. while visiting UT-Austin was provided by a Portugal-UT collaboration grant.
dc.identifier.citationLujan, D; Choe, J; Rodriguez-Vega, M; Ye, ZP; Leonardo, A; Nunley, TN; Chang, LJ; Lee, SF; Yan, JQ; Fiete, GA; He, R; Li, XQ. Magnons and magnetic fluctuations in atomically thin MnBi2Te4. Nat. Commun. 2022, 13(1), 2527-. DOI: 10.1038/s41467-022-29996-w.
dc.identifier.doiDOI: 10.1038/s41467-022-29996-w.
dc.identifier.urihttps://hdl.handle.net/2152/123642
dc.identifier.urihttps://doi.org/10.26153/tsw/50436
dc.language.isoen_US
dc.publisherSpringer Nature Limited
dc.relation.ispartofCenter for Dynamics and Control of Materials Publications
dc.rightsAttribution 3.0 United Statesen
dc.rights.restrictionOpen
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/
dc.subjectMagnons
dc.titleMagnons and magnetic fluctuations in atomically thin MnBi2Te4
dc.typeArticle

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