论文标题
通过局部功率测量直接确定拓扑导热
Direct Determination of the Topological Thermal Conductance via Local Power Measurement
论文作者
论文摘要
对电荷和无还原的能量流敏感的导热电导测量正在作为凝结物理学中的必不可少的测量技术发展。对于二维拓扑绝缘子，热厅电导的测量值，$κ_{xy} t $和纵向的One $κ_{xx} T $，对于理解其潜在拓扑顺序的理解至关重要。到目前为止，即使在经过广泛研究的量子霍尔效应（QHE）制度中，此类测量值也缺乏。在这里，我们报告了一种新的局部功率测量技术，该技术揭示了拓扑热霍尔电导（不是无处不在的两末端）。例如，我们发现$κ_{xy} \ sim0 $ $ν= 2/3 $粒子孔共轭状态。这与两端测量相反，两端测量提供了一个非宇宙值，该值取决于反传播边缘模式之间的热平衡程度。此外，我们使用这种技术来研究以不平衡分布的分区边缘模式下电流波动所携带的功率。
Thermal conductance measurements, sensitive to charge and chargeless energy flow, are evolving as an essential measurement technique in Condensed Matter Physics. For two-dimensional topological insulators, the measurements of the thermal Hall conductance, $κ_{xy}T$, and the longitudinal one $κ_{xx}T$, are crucial for the understanding of their underlying topological order. Such measurements are thus far lacking, even in the extensively studied quantum Hall effect (QHE) regime. Here, we report a new local power measurement technique that reveals the topological thermal Hall conductance (not the ubiquitous two-terminal one). For example, we find $κ_{xy}\sim0$ of the challenging $ν=2/3$ particle-hole conjugated state. This is in contrast to the two-terminal measurement, which provides a non-universal value that depends on the extent of thermal equilibration between the counter-propagating edge modes. Moreover, we use this technique to study the power carried by the current fluctuations in a partitioned edge mode with an out-of-equilibrium distribution.
