金刚石中热霍尔效应的观测
Observation of thermal Hall effect in diamond
AI总结：
本研究观测到金刚石中存在热霍尔效应，测得其横向热导率创绝缘体领域最大值，证实通用声子气体中存在本征热霍尔效应，相关振幅可通过基础物理理论解释。
AI中文摘要：
包括非磁性绝缘体在内的众多绝缘体被意外发现具有有限的热霍尔信号，这引发了对其起源的争论。本文报道了对两种金刚石单晶中热霍尔效应的研究，发现横向热导率（κ_xy）在接近纵向热导率（κ_xx）达到最大值的温度时出现峰值；在B=10T下测得的κ_xy振幅为340W/(m·K)，是迄今观测到的最大值，而κ_xy/κ_xx比值遵循其他绝缘体中确定的唯象趋势。我们的观测表明，通用声子气体中存在本征热霍尔效应；我们认为，热霍尔角和热霍尔电阻率的大致振幅可通过基本常数及固态内聚力的量子力学约束相关简单论证来解释。
英文摘要：
Numerous insulators, including non-magnetic ones, have been unexpectedly found to display a finite thermal Hall signal, which has stimulated debate about its origin. Here, we report on a study of the thermal Hall effect in two diamond single crystals. The transverse thermal conductivity (kappa_xy) was found to peak at a temperature close to that at which the longitudinal thermal conductivity (kappa_xx) reaches its maximum. The measured kappa_xy, with an amplitude of 340 W/(m K) at B = 10 T, is the largest ever observed, while the kappa_xy/kappa_xx ratio follows the phenomenological trend identified in other insulators. Our observation implies the existence of an intrinsic thermal Hall effect in a generic phonon gas. We argue that the rough amplitude of both the thermal Hall angle and the thermal Hall resistivity can be accounted for by simple arguments invoking fundamental constants and quantum-mechanical constraints on solid state cohesion.
