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강상관계 물질 연구단
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Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn

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Title
Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn
Author(s)
Pyeongjae Park; Joosung Oh; Klára Uhlířová; Jerome Jackson; András Deák; László Szunyogh; Ki Hoon Lee; Hwanbeom Cho; Ha-Leem Kim; Helen C. Walke; Devashibhai Adroja; Vladimír Sechovsk; Je-Geun Park
Publication Date
2018-12
Journal
NPJ Quantum Materials, v.3, no.1, pp.63 -
Publisher
Nature Publishing Group
Abstract
Mn3Sn has recently attracted considerable attention as a magnetic Weyl semimetal exhibiting concomitant transport anomalies at room temperature. The topology of the electronic bands, their relation to the magnetic ground state and their nonzero Berry curvature lie at the heart of the problem. The examination of the full magnetic Hamiltonian reveals otherwise hidden aspects of these unusual physical properties. Here, we report the full spin wave spectra of Mn3Sn measured over a wide momentum?energy range by the inelastic neutron scattering technique. Using a linear spin wave theory, we determine a suitable magnetic Hamiltonian which not only explains the experimental results but also stabilizes the low-temperature helical phase, consistent with our DFT calculations. The effect of this helical ordering on topological band structures is further examined using a tight binding method, which confirms the elimination of Weyl points in the helical phase. Our work provides a rare example of the intimate coupling between the electronic and spin degrees of freedom for a magnetic Weyl semimetal system. ? 2018, The Author(s)
URI
https://pr.ibs.re.kr/handle/8788114/5388
ISSN
2397-4648
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
2018-262_Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn.pdfDownload

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