利用弗洛凯驱动设计量子热二极管
Engineering a Quantum Thermal Diode with Floquet Driving
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中文总结 AI 辅助
研究如何在量子热二极管中控制热流，通过建立弗洛凯控制机制，推导主方程，以单侧、双侧驱动实现不同热流控制效果，确立接触选择性弗洛凯修饰为可控热流不对称的设计原则。
中文摘要 AI 辅助
控制小量子系统中的热流是量子热力学和纳米尺度输运的核心目标。关键挑战是在不抑制传输热电流的情况下实现强热整流，这在静态二极管配置中常出现权衡。我们在由两个纵向调制的伊辛耦合量子比特形成的最小量子热二极管中建立了弗洛凯控制机制，每个量子比特与独立热库耦合。从微观系统 - 热库模型推导出弗洛凯 - LGKS主方程以解析驱动辅助跃迁通道。具有左右对称热库耦合的共振无驱动器件作为互易基准，静态失谐提供了热电流降低的整流参考。单侧驱动通过创建与纯热接触相对的弗洛凯修饰接触打破互易结构。对于此配置，我们获得了紧凑的稳态电流公式和精确的阻断条件。在弱正弦驱动 regime，整流在调制幅度上二次开始。双侧驱动为相互作用介导的电流增加了弗洛凯泵浦贡献，因此完全阻断需要两种贡献抵消。这些结果确立了接触选择性弗洛凯修饰作为最小量子器件中可控热流不对称的设计原则。
英文摘要
Controlling heat flow in small quantum systems is a central goal of quantum thermodynamics and nanoscale transport. A key challenge is to achieve strong thermal rectification without suppressing the transmitted heat current, a tradeoff that often arises in static diode configurations. We establish a Floquet-control mechanism in a minimal quantum thermal diode formed by two longitudinally modulated Ising-coupled qubits, each coupled to an independent thermal reservoir. From a microscopic system--bath model, we derive a Floquet--LGKS master equation that resolves the drive-assisted transition channels. The resonant undriven device with left--right symmetric bath couplings serves as the reciprocal benchmark, while static detuning provides a rectifying reference with reduced heat current. Single-side driving breaks this reciprocal structure by creating a Floquet-dressed contact opposite a purely thermal contact. For this configuration, we obtain a compact steady-state current formula and an exact blocking condition for suppressing one bias direction while retaining finite transport in the opposite direction. In the weak sinusoidal-drive regime, rectification begins quadratically in the modulation amplitude. Dual-side driving adds a Floquet pumping contribution to the interaction-mediated current, so complete blocking requires cancellation of both contributions. These results establish contact-selective Floquet dressing as a design principle for controllable heat-flow asymmetry in minimal quantum thermal devices.
