Limitations of the kinetic theory to describe the near-field heat exchanges in many-body systems

Friction and Radiative Heat Exchange in a System of Two Parallel Plates Moving Sideways : Levin-Polevoy-Rytov Theory Revisited

It is shown that the fundamental results obtained in the works by Levine, Polevoi, Rytov (1980) and Polevoi (1990), based on the fluctuation-electromagnetic theory by Levine and Rytov, adequately describe the rate of radiative heat exchange and the frictional force in a system of two parallel thick plates in relative lateral motion. A numerically calculated friction force for good metals and thin gaps turns out to be by a factor 107 higher than earlier obtained by Polevoi and increases with increasing conductivity of the metals.

Thermomechanical bistability of phase-transition oscillators driven by near-field heat exchange

Systems with multistable equilibrium states are of tremendous importance in information science to conceive logic gates. Here we predict that simple phase-transition oscillators driven by near-field heat exchanges have a bistable thermomechanical behavior around their critical temperature, opening so the way to a possible boolean treatment of information from heat flux at microscale.

Experimental verification of quantum heat exchange fluctuation relation

We experimentally verify the Jarzynski and Wöjcik quantum heat exchange fluctuation relation by implementing the interferometric technique in liquid-state Nuclear Magnetic Resonance setup and study the exchange heat statistics between two weakly coupled spin-1/2 quantum systems. In presence of uncorrelated initial state with individual spins prepared in local Gibbs thermal states at different temperatures, the exchange fluctuation symmetry is verified for arbitrary transient time. In contrast, when the initial preparation includes correlation, the fluctuation symmetry breaks down and further l…

动力学理论中的手征热波和混合波

Chiral heat wave and mixed waves in kinetic theory

本文从动力学理论出发，研究了在有磁场存在下热旋转手征介质中的集体激发，即手征热波及其与手征涡旋波、手征磁波的混合。我们对这些波的速度的结果与以前得到的结果略有不同。我们解释了这些变化的起源，并给出了最一般的表达式，所有这些波的速度在流体动力学的方法。

Near-field refrigeration and tunable heat exchange through four-wave mixing

We modify and extend a recently proposed four-wave mixing scheme [Opt. Express 25 (19),23164 (2017)] for achieving near-field thermal upconversion and energy transfer, to demonstrate efficient thermal refrigeration at low intensities $\sim 10^{-9}$W/m$^2$ over a wide range of gap sizes (from tens to hundreds of nanometers) and operational temperatures (from tens to hundreds of Kelvins). We further exploit the scheme to achieve magnitude and directional tunability of near-field heat exchange between bodies held at different temperatures.

量子力学中的交换涨落定理

The exchange fluctuation theorem in quantum mechanics

本文研究了两个初始温度不同的有限量子系统之间的热传递。我们发现最近提出的热交换涨落定理，即交换涨落定理[C。Jarzynski和D. K. Wojcik，Phys. Rev. Lett. 92，230602（2004）]，在有限热传递的存在下通常不成立，如在弱耦合的原始形式中所证明的。当耦合减弱时，对定理的偏离和热传递以相同的耦合阶数消失。然后，我们发现了交换涨落定理在有限热传递存在下成立的条件，即交换耦合条件。我们明确地计算了交换涨落定理的偏差以及简单模型的传热。我们确认的模型，偏差确实有一个有限的值，只要两个系统之间的耦合是有限的，除了特殊点的可交换耦合条件。我们还确认分析，交换耦合条件确实让交换涨落定理持有有限的热传递。

开放量子系统含时热交换的泛函积分方法：一般方法及应用

Functional Integral approach to time-dependent heat exchange in open quantum systems: general method and applications

建立了耦合到热库的外驱动量子系统的含时热交换的路径积分方法。我们推导出相关的影响泛函，并提出了一个精确的形式表达的时刻生成功能，携带一般线性耗散的热交换过程的所有统计特性。将一般方法应用于耗散两态系统的含时平均传热。我们表明，热可以写为卷积积分，其中涉及人口和相干关联函数的两态系统和额外的相关性，由于极化的水库。对于白噪声和量子力学色噪声，相应的表达式都可以在弱阻尼极限下求解。纯量子效应的影响进行了讨论。总之，实现了从经典制度到零温度的平均传热的动态的完整描述。

分子动力学模拟中热交换统计的挑战

Challenges in molecular dynamics simulations of heat exchange statistics

本研究针对分子动力学模拟中热交换统计的挑战，提出单原子恒温器方法，成功生成正确的概率分布函数，并验证热力学不确定性关系，为热输运噪声研究提供指导。

An atomically flat single-crystalline gold film thermometer on mica to study energy (heat) exchange at the nano-scale

There is a great interest in the scientific community to perform calorimetry on samples having mass in the nanogram range. A detailed knowledge of the energy (heat) exchange in the fast growing family of micro- and nano-systems could provide valuable information about the chemistry and physics at the nano-scale. The possibility to have an atomically flat thermal probe represents an added value, because it provides the unique opportunity to perform Scanning Probe Microscopy (SPM) together with calorimetry. Here we report the fabrication, characterization, and calibration of atomically flat, sin…