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강상관계 물질 연구단
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Magnon topology and thermal Hall effect in trimerized triangular lattice antiferromagnet

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Title
Magnon topology and thermal Hall effect in trimerized triangular lattice antiferromagnet
Author(s)
Kyung-Su Kim; Ki Hoon Lee; Suk Bum Chung; Je-Geun Park
Publication Date
2019-08
Journal
PHYSICAL REVIEW B, v.100, no.6, pp.064412 -
Publisher
AMER PHYSICAL SOC
Abstract
The nontrivial magnon band topology and its consequent responses have been extensively studied in two-dimensional magnetisms. However, the triangular lattice antiferromagnet (TLAF), the best-known frustrated two-dimensional magnet, has received less attention than the closely related Kagome system, because of the spin-chirality cancellation in the umbrella ground state of the undistorted TLAF. In this paper, we study the band topology and the thermal Hall effect (THE) of the TLAF with (anti-)trimerization distortion under the external perpendicular magnetic field using the linearized spin wave theory. We show that the spin-chirality cancellation is removed in such case, giving rise to the nontrivial magnon band topology and the finite THE. Moreover, the magnon bands exhibit band topology transitions tuned by the magnetic field. We demonstrate that such transitions are accompanied by the logarithmic divergence of the first derivative of the thermal Hall conductivity. Finally, we examine the above consequences by calculating the THE in the hexagonal manganite YMnO3, well known to have antitrimerization. ©2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/6520
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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