标题： 栅极可调的拓扑绝缘体表面态上的非互易热电效应 显示英文标题

标题： Gate-tunable nonreciprocal thermoelectric effects on the surface states of topological insulators

摘要： 纳米尺度的热电设备为片上制冷和废热回收提供了有前景的途径，然而大多数基于半导体的实现存在可调性有限和工作范围狭窄的问题。 我们介绍了一种高度灵活的热电平台，该平台基于由拓扑绝缘体表面态的两个栅极可调区域通过磁性屏障连接而成的弹道结。 我们理论证明，通过侧栅可以对制冷和热电功率产生强烈的电气控制。 我们利用强自旋-轨道耦合与磁性的相互作用，实现了显著的非互易输运、不对称制冷和可调的二极管行为。 为了展示实验可行性，我们进一步分析了在实际材料条件下的制冷效率和声子限制性能。 显示英文摘要

摘要： Thermoelectric devices at the nanoscale offer promising routes for on-chip refrigeration and waste-heat recovery, yet most semiconductor-based implementations suffer from limited tunability and narrow operational ranges. We introduce a highly flexible thermoelectric platform based on a ballistic junction formed by two gate-tunable regions of a topological insulator surface state bridged by a magnetic barrier. We theoretically demonstrate that such device exhibits strong electrical control over both refrigeration and thermoelectric power generation via side gates. We exploit the interplay between strong spin-orbit coupling and magnetism to achieve pronounced nonreciprocal transport, asymmetric cooling and tunable diode-like behavior. To demonstrate experimental feasibility, we further analyze refrigeration efficiency and phonon-limited performance in realistic material settings.