欢迎来到唐高民的量子输运课题组
Quantum Transport Theory Group at GSCAEP
光子自旋热电子学 | Photonic spin caloritronics
传统自旋热电子学（包括自旋塞贝克、自旋珀耳帖和自旋泵浦效应）主要通过界面热传导来产生与操纵自旋流。这些效应通常依赖于异质结之间的直接物理接触，并由磁振子等元激发进行介导。然而，由于自然热辐射通常缺乏净角动量且难以与电子自旋直接耦合，利用热辐射来产生和利用自旋流的物理机制此前一直未被探索。针对这一空白，课题组提出了由近场热辐射驱动的自旋塞贝克效应，为非接触式自旋热操控提供了全新的途径。基于微观理论，课题组揭示了利用Rashba自旋轨道耦合将光子轨道激发转化为电子自旋极化的物理机制。（详见：arXiv:2609.06411）
Conventional spin caloritronics (including the spin Seebeck, spin Peltier, and spin pumping effects) generates and manipulates spin currents via interfacial thermal conduction, relying on direct physical contact. Using thermal radiation for spin generation has remained unexplored because natural thermal emission lacks net angular momentum and couples weakly to electron spins. To address this gap, the group proposed a spin Seebeck effect driven by near-field thermal radiation, offering a novel pathway for contactless spin manipulation. Based on microscopic theory, the study reveals how Rashba spin-orbit coupling converts optical orbital excitations into electron spin polarization. (see: arXiv:2609.06411 for details).
横向热光伏 | Transverse thermophotovoltaics
近场热光伏效应通过利用热辐射源与光伏电池之间的近场倏逝波耦合，可显著突破黑体辐射极限，在热光能量转换领域具有重要前景。传统热光伏效应一般依赖半导体p-n结或肖特基结构，电流方向沿温度梯度方向。唐高民等人于2021年提出了横向热光伏的新概念：在两个辐射体之间，可在垂直于温度梯度的方向上产生电流，为热光能量转换提供了新的范式（详见：Phys. Rev. Lett. 127, 247401 (2021)）。然而，该效应能否实现及其微观物理机制仍有待探索。课题组基于微观理论，揭示了近场热辐射通过非互易表面等离子激元驱动横向电流的物理机制，为横向热光伏效应奠定了理论基础（详见：Phys. Rev. Lett. 136, 176901 (2026)）。
Based on microscopic theory, the group revealed the physical mechanism of near-field thermal radiation driving transverse currents via non-reciprocal surface plasmon polaritons, laying the theoretical foundation for the transverse thermophotovoltaic effect (see: Phys. Rev. Lett. 136, 176901 (2026) for details).
含时驱动热辐射 | Time-modulated thermal radiation
周期性时间调制可以增强热光的相干性，从而实现对辐射热流的精准调控并产生新奇效应。我们利用非平衡格林函数方法，建立了超越传统涨落电动力学描述的理论框架，用以描述含时驱动下的热辐射现象。详见：Phys. Rev. B 109, 085428 (2024); Phys. Rev. B 112, L041401 (2025); Phys. Rev. B 113, 085414 (2026)。
Periodic time modulation can enhance the coherence of thermal photons, thereby enabling the manipulation of radiative heat flux and the emergence of novel effects. Using the nonequilibrium Green's Function formalism, we established a theoretical framework that goes beyond conventional fluctuational electrodynamics to describe thermal radiation under Floquet driving. For further details, see: Phys. Rev. B 109, 085428 (2024); Phys. Rev. B 112, L041401 (2025); Phys. Rev. B 113, 085414 (2026).
蜃景能隙 | Mirage gaps
在二维伊辛超导里，面内磁场会诱导自旋三态配对和相应的蜃景能隙。蜃景能隙出现在远离费米能级大约自旋轨道耦合强度的能量处。这打破了我们对超导配对只能发生在费米能附近的传统观念。由于伊辛超导的自旋单态和三态配对可被相应的铁磁层提供的交换场调控，我们可以通过控制交换场的大小以及相对方向来调节约瑟夫森结中超电流和超自旋流。此外，蜃景能隙通过抑制石墨烯势场波动的影响，增强了观测镜面安德烈耶夫反射的实验鲁棒性。详见： Phys. Rev. Lett. 126, 237001 (2021); Phys. Rev. B 104, L241413 (2021); Phys. Rev. B 112, L081407 (2025)。
In 2D Ising superconductors, an in-plane magnetic field induces mirage gaps with spin-triplet pairings. The mirage gaps emerge at (high) energies of the order of the spin-orbit coupling strength. This challenges the conventional paradigm that superconducting pairing is restricted to the vicinity of the Fermi surface. The highly tunable spin-triplet pairing correlations allow to modulate the charge and spin supercurrents through in-plane magnetic exchange fields. Furthermore, the mirage gap enhances the experimental robustness of observing specular Andreev reflection by effectively suppressing the impact of potential fluctuations in graphene. For further details, see: Phys. Rev. Lett. 126, 237001 (2021); Phys. Rev. B 104, L241413 (2021); Phys. Rev. B 112, L081407 (2025).