Abstract:

　　Driven-dissipative physics lie at the core of quantum optics, but the full interplay between a driven quantum many-body system and its environment remains relatively unexplored in the solid-state realm. In this talk, based on the specific example of a driven superconductor, we investigate from a theoretical perspective the breakdown of the Lindblad formalism due to the invalidity of rotating-wave approximation. Within this regime, we show how a drive which anti-commutes with the superconducting gap operator generically induces an unusual “Floquet Fermi sea” structure, i.e., a particle-hole structure in the spectral functions from the perspective of the thermal bath. Concomitant with a driving frequency near resonant with the intrinsic cutoff frequency of the underlying interaction, this spectral structure can be harnessed to enhance the superconducting transition temperature. Our work enlightens further studies for driven-dissipative engineering of exotic phases of matter in solid-state systems.
Reference: R. Lin, A. Ramires, R. Chitra, Phys. Rev. Lett. 133, 086001 (2024)

报告人简历：

　　林睿， 2023年于瑞⼠苏黎世联邦理⼯学院（ETH Zürich）获得物理学博⼠学位；后于奥地利量⼦光学研究所（IQOQI Innsbruck）进⾏博⼠后研究⼯作。加⼊⼤湾区量⼦科学中⼼后，任副研究员，主要研究基于冷原⼦体系的开放量⼦多体体系中的物态和动⼒学问题。
　　主要从事量⼦模拟与量⼦计算领域中，基于冷原⼦体系的量⼦多体问题的理论研究。研究课题包括谐振腔—冷原⼦体系中基于Lindblad形式的开放体系动⼒学问题、基于FloquetKeldysh理论的量⼦多体驱动耗散体系研究、⾥德堡阵列中的“最⼤独⽴集”求解问题等。学术成果发表在Phys. Rev. Lett.、 PRX Quantum等国际期刊上。