Thermal Hall Transport in Spiral Magnet and Spin Liquid

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• Jung Hoon Han, Department of Physics, Sungkyunkwan University, South Korea
• Friday 25 June 2021, 10:00-11:00
• https://bham-ac-uk.zoom.us/j/87537747290?pwd=QkFrMStXS2UycTg0NGtxUnpBOHRWUT09.

If you have a question about this talk, please contact Mingee Chung.

As a former PhD student of David Thouless and a practitioner of skyrmion physics in condensed matter systems, I could not be more excited about the opportunity to present my recent work on emergent electrodynamics in skyrmion matter and some other quantum magnets at the University of Birmingham (where it all started). First I discuss recent observation of thermal Hall transport in a spiral magnet hosting the skymion lattice phase. The magnon thermal Hall effect caused by the magnons seeing the skyrmion as a source of emergent magnetic flux had long been predicted theoretically, but was not observed until recently [1]. The observed magnon thermal Hall effect (THE) finds convincing agreement with the model calculation which I will describe. In the second part of the talk, I discuss the observation of THE in a kagome spin liquid compound Cd-K [2]. A careful analysis of the data suggests a dual origin of the transport coming from both phonons and some kind of spin excitations. A sketch of the theoretical idea behind such interpretation will be given.

1. M. Akazawa et al., arXiv:2102.06430 (2021). 2. M. Akazaka et al., Phys. Rev. X 10 , 041059 (2020).

This talk is part of the Condensed Matter Physics Seminars series.

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• Bham Talks
• Cond. Mat. seminar
• Condensed Matter Physics Seminars
• What's on in Physics?
• https://bham-ac-uk.zoom.us/j/87537747290?pwd=QkFrMStXS2UycTg0NGtxUnpBOHRWUT09

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