30 April 2024 Tue 4 pm

In the recent years there have been many unexpected thermal transport behaviors observed over a wide range of materials, creating many puzzles in the condensed matter community. I will talk about our phenomenological studies on the puzzles in some of the most important materials, including the unexpectedly large thermal Hall effects observed in SrTiO3 (a widely used perovskite), La2CuO4 (parent cuprate compound), and alpha-RuCl3 (candidate of Kitaev material), as well as the longitudinal thermal conductivity in alpha-RuCl3 which has strange oscillatory signature with applied magnetic field. We conclude a common theme is the unusual interplay of phonons with either dynamical or extended defects. We advocate for the direct experimental detection of these defects.

References:

[1] Jing-Yuan Chen, Steven A. Kivelson and Xiao-Qi Sun, Enhanced Thermal Hall Effect in Nearly Ferroelectric Insulators, Phys.Rev.Lett. 124 (2020) 167601, [1910.00018]

[2] Xiao-Qi Sun, Jing-Yuan Chen and Steven A. Kivelson, Large Extrinsic Phonon Thermal Hall Effect from Resonant Scattering, Phys.Rev.B 106 (2022) 144111, [2109.12117]

[3] Zheng-Duo Fan, Xiao-Qi Sun and Jing-Yuan Chen, On the Thermal Transport Puzzles in alpha-RuCl3, [2312.06601]

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