应我校91直播 赵军明教授邀请，法国国家科学研究中心（CNRS）Philippe Ben-Abdallah教授将来校交流并作学术报告，届时将进行近场辐射传热、非互易热光子学和极端近场热传递三个主体内容的介绍，欢迎感兴趣的师生参加。

主讲人：Philippe Ben-Abdallah

专家简介：Philippe Ben-Abdallah，法国国家科学研究中心（CNRS）研究主任，任职于法国巴黎-萨克雷大学光学研究所夏尔·法布里实验室，负责热等离激元研究组。其研究处于纳米光子学、统计物理、凝聚态物理与热科学的交叉领域，重点关注纳米尺度光控热传递。他在近场辐射传热、多体热相互作用及热光子学等领域作出开创性贡献，提出了基于热辐射的热二极管、热晶体管、热存储器和热逻辑器件等概念。已发表150余篇同行评议论文，并在Physical Review Letters、Reviews of Modern Physics、Nature Communications等期刊发表代表性成果；已在国际会议和研讨会作70余场受邀报告，并长期服务于科研委员会、期刊编委会及国内外科研资助机构评审工作。

报告1题目：Near-field heat transfer in many-body systems: from theory to applications

时间地点：2026年10月14日 10：00-12：00 教西楼506-2会议室

Abstract：

This lecture explores the fundamental mechanisms of radiative heat transfer at the nanoscale, where evanescent electromagnetic fields enable energy exchanges far exceeding the blackbody limit. Particular emphasis is placed on many-body interactions, which give rise to collective effects, non-additive heat exchanges, and anomalous transport regimes ranging from diffusion to superdiffusion and ballistic propagation. Using fluctuational electrodynamics and a generalized random-walk description, we examine how thermal energy propagates through networks of interacting nanoparticles. The seminar also introduces thermotronics, a field exploiting thermal photons to control heat flow and process information through radiative thermal diodes, transistors, memories, and logic gates.

报告摘要：

本报告探讨纳米尺度辐射传热的基本机制。在这一尺度上，倏逝电磁场可促成远超黑体极限的能量交换。报告重点讨论多体相互作用引起的集体现象、非叠加性热交换，以及从扩散、超扩散到弹道传播的异常输运。借助涨落电动力学和广义随机游走描述，报告分析热能如何在相互作用纳米颗粒网络中传播，并介绍热电子学这一利用热光子调控热流和处理信息的研究方向，包括辐射热二极管、晶体管、存储器和逻辑门。

报告2题目：Thermal photonics in non-reciprocal and time-modulated many-body systems

时间地点：2026年10月15日 10：00-12：00  教西楼506-2会议室

Abstract：

This lecture presents emerging approaches for actively controlling radiative heat transfer through the breaking of electromagnetic reciprocity. We first investigate magneto-optical many-body systems, where external magnetic fields induce asymmetric energy exchanges and unconventional phenomena such as the photon thermal Hall effect. We then explore spin-controlled radiative heat transport, showing how spatial gradients of electromagnetic spin angular momentum can drive heat currents even in the absence of a temperature gradient. Finally, we discuss time-modulated photonic systems, where dynamic modulation of optical properties enables frequency conversion and directional control of thermal radiation. These mechanisms open new perspectives for active thermal management, heat routing, and radiative energy pumping at the nanoscale.

报告摘要：

本报告介绍通过打破电磁互易性主动调控辐射传热的新方法。首先研究磁光多体系统，其中外加磁场可引起非对称能量交换及光子热霍尔效应等非常规现象。随后探讨自旋可控辐射热输运，说明电磁自旋角动量的空间梯度即使在没有温度梯度时也可驱动热流。最后讨论时间调制光子系统，光学性质的动态调制可以实现频率转换与热辐射的定向调控。这些机制为纳米尺度主动热管理、热流路由和辐射能量泵送提供了新思路。

报告3题目：Near-field heat transfer in extreme near-field regime

时间地点：2026年10月15日 14：00-16：00  教西楼506-2会议室

Abstract：

This lecture explores radiative heat transfer at nanometric and subnanometric separations, where conventional fluctuational electrodynamics may become insufficient. We first examine the role of nonlocal optical response and acoustic phonons in heat exchanges between closely spaced polar materials. Particular emphasis is placed on the emergence of correlations between thermal fluctuations in distinct bodies, a mechanism which is not present in the conventional independent-source description. Using a microscopic coupled-oscillator model and a Green-tensor formulation, we show how the hybridization of surface phonon-polaritons generates fluctuating-current cross correlations that can strongly enhance heat transfer. For materials such as SiC, these effects can lead to heat fluxes exceeding conventional predictions by more than an order of magnitude, opening new perspectives for radiative heat transport in strongly coupled and correlated systems.

报告摘要：

本报告探索纳米及亚纳米间隙下的辐射传热，此时传统涨落电动力学可能已不足以描述相关过程。报告首先考察非局域光学响应和声学声子在紧邻极性材料热交换中的作用，重点讨论不同物体热涨落之间相关性的出现。这一机制并未包含在传统的独立源描述中。采用微观耦合振子模型和格林函数表述，报告说明表面声子极化激元的杂化如何产生涨落电流的交叉相关并显著增强热传递。以碳化硅等材料为例，这些效应产生的热流可能比传统预测高一个数量级以上，为强耦合和关联体系中的辐射热输运研究开辟新方向。