Laser control of solids was so far mainly discussed in the context of strong classical nonlinear light-matter coupling in a pump-probe framework. Here we propose a quantum-electrodynamical setting to address the coupling of a low-dimensional quantum material to quantized electromagnetic fields in quantum cavities. Using a protoypical model system describing FeSe/SrTiO$_3$ with electron-phonon long-range forward scattering, we study how the formation of phonon polaritons at the 2D interface of the material modifies effective couplings and superconducting properties in a Migdal-Eliashberg simulation. We find that through highly polarizable dipolar phonons, large cavity-enhanced electron-phonon couplings are possible but superconductivity is not enhanced for the forward-scattering pairing mechanism due to the interplay between coupling enhancement and mode softening. An analysis of critical temperature dependencies on couplings and mode frequencies suggests that that cavity-enhanced superconductivity is possible for more conventional short-range pairing mechanisms. Our results demonstrate that quantum cavities enable the engineering of fundamental couplings in solids paving the way to unprecedented control of material properties.
No-Go Theorem and Routes towards Cavity-Enhanced Superconductivity
Tsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University（上海交大李政道研究所与物理与天文学院）；Shanghai Branch, Hefei National Laboratory（合肥国家实验室上海分部）
Emergence of Triplet Superconductivity from Cavity Vacuum Fluctuations
Shanghai Qizhi Institute（上海启智研究院）；Shanghai Artificial Intelligence Laboratory（上海人工智能实验室）；Fudan University（复旦大学）；Shanghai Research Center for Quantum Sciences（上海量子科学研究中心）；Hefei National Laboratory（合肥国家实验室）
Cavity Tuning of the CDW--Superconductivity Interplay in a Kagome Metal
Tsientang Institute for advaced study（钱塘高等研究院）；Songshan Lake Materials Laboratory（松山湖材料实验室）；Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science（马普物质结构与动力学研究所及自由电子激光科学中心）；Department of Materials Science and Engineering, City University of Hong Kong（香港城市大学材料科学与工程系）；Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST)（光州科学技术院物理与光子科学系）；The Flatiron Institute（平顿研究所）
Cavity-enhanced superconductivity in the two-dimensional limit of NbSe2
Centre for Quantum Technologies（量子技术中心）；Nanyang Technological University（南洋理工大学）；Max Planck Institute for the Structure and Dynamics of Matter（马普物质结构与动力学研究所）；National Yang Ming Chiao Tung University（国立阳明交通大学）；The Photonics Institute（光子研究所）；Division of Physics and Applied Physics, School of Physical and Mathematical Sciences（物理与数学科学学院物理与应用物理系）；Quantum Science and Engineering Center (QSec)（量子科学与工程中心）；Research Center for Electronic and Optical Materials, National Institute for Materials Science（国家材料研究所电子与光学材料研究中心）；Research Center for Materials Nanoarchitectonics, National Institute for Materials Science（国家材料研究所材料纳米架构研究中心）；University of Notre Dame（圣母大学）；Initiative for Computational Catalysis (IIC) and Center for Computational Quantum Physics (CCQ), The Flatiron Institute（平 insted 研究所计算催化倡议与计算量子物理中心）
Superconductivity and other phase transitions in a hybrid Bose-Fermi mixture formed by a polariton condensate and an electron system in two dimensions
相互作用玻色-费米系统在凝聚态物理中起着核心作用。在这里，我们分析了一种新的玻色费米混合形成的腔激子极化激元凝聚体与二维电子系统的相互作用。我们表明，以前的预测超导[F. P. Laussy，物理评论Lett。10，104（2010）]和激子超固体形成[I.A. Shelykh，Phys. Rev. Lett. 14，105（2010）]在这个系统中紧密交织在一起-类似于对强关联电子系统如高温超导体的预测。与大多数在固体和超冷原子气体中分析的玻色-费米系统形成鲜明对比的是，我们系统中极化激元和电子之间的重整化相互作用是长程的，并且在可调波矢处强烈达到峰值，这可以与费米动量不相称。我们分析了超导性的实验观察的前景，并发现，临界温度的几个开尔文的顺序可以实现在异质结构中的过渡金属二硫属化物单层嵌入在一个开放的腔结构。半导体异质结构中超导性的全光学控制可以实现与半导体纳米技术兼容的新器件概念。此外，量子霍尔物理学、超导性和非平衡极化子凝聚的接口可能为研究全新的物理现象提供肥沃的土壤。
Cavity-enhanced superconducting response in an underdoped cuprate
Friedrich-Alexander University of Erlangen–Nuremberg（埃尔朗根-纽伦堡大学）；University of Augsburg（奥格斯堡大学）；RWTH Aachen（亚琛工业大学）；Max Planck Institute for the Science of Light（马克斯·普朗克光科学研究所）
