Enhanced Thermal Hall Effect in Nearly Ferroelectric Insulators.
作者： Jing-Yuan Chen , Steven A. Kivelson , Xiao-Qi Sun
DOI: 10.1103/PHYSREVLETT.124.167601
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摘要: In the context of recent experimental observations an unexpectedly large thermal Hall conductivity, κ_{H}, in insulating La_{2}CuO_{4} (LCO) and SrTiO_{3} (STO), we theoretically explore conditions under which acoustic phonons can give rise to such a κ_{H}. Both intrinsic extrinsic contributions κ_{H} are proportion dielectric constant, e, "flexoelectric" coupling, F. While contribution is still orders magnitude smaller than observed effect, proportional phonon mean-free path appears likely account for observations, at least STO. We predict larger certain perovskites.
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