Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn

Pyeongjae Park, Joosung Oh, Klára Uhlířová, Jerome Jackson, András Deák, L. Szunyogh, Ki Hoon Lee, Hwanbeom Cho, Ha Leem Kim, Helen C. Walker, Devashibhai Adroja, Vladimír Sechovský, Je Geun Park

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish
Article number63
Journalnpj Quantum Materials
Volume3
Issue number1
DOIs
Publication statusPublished - Dec 1 2018

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Hamiltonians
Metalloids
Spin waves
metalloids
magnons
Inelastic neutron scattering
electronics
Discrete Fourier transforms
Band structure
Ground state
excitation
elimination
inelastic scattering
neutron scattering
topology
Physical properties
degrees of freedom
physical properties
examination
curvature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn. / Park, Pyeongjae; Oh, Joosung; Uhlířová, Klára; Jackson, Jerome; Deák, András; Szunyogh, L.; Lee, Ki Hoon; Cho, Hwanbeom; Kim, Ha Leem; Walker, Helen C.; Adroja, Devashibhai; Sechovský, Vladimír; Park, Je Geun.

In: npj Quantum Materials, Vol. 3, No. 1, 63, 01.12.2018.

Research output: Contribution to journalArticle

Park, P, Oh, J, Uhlířová, K, Jackson, J, Deák, A, Szunyogh, L, Lee, KH, Cho, H, Kim, HL, Walker, HC, Adroja, D, Sechovský, V & Park, JG 2018, 'Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn', npj Quantum Materials, vol. 3, no. 1, 63. https://doi.org/10.1038/s41535-018-0137-9
Park, Pyeongjae ; Oh, Joosung ; Uhlířová, Klára ; Jackson, Jerome ; Deák, András ; Szunyogh, L. ; Lee, Ki Hoon ; Cho, Hwanbeom ; Kim, Ha Leem ; Walker, Helen C. ; Adroja, Devashibhai ; Sechovský, Vladimír ; Park, Je Geun. / Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn. In: npj Quantum Materials. 2018 ; Vol. 3, No. 1.
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