Seminar Talk at CTP-SCU / 理论物理中心学术报告

Speaker: 安钧鸿 教授  (兰州大学)

Title: Detecting Floquet quasienergy spectrum by resonance fluorescence

Abstract:
Recently, the Floquet states of matter of quantum systems under periodic driving has attracted much attention, which opens a new door to artificially synthesize exotic quantum states of matter, especially the ones absent in static systems, by periodic driving. However, it is still an open question that how to detect these novel Floquet states of matter in such time-dependent systems. Based on Floquet theorem and going beyond the rotating-wave approximation, we establish the microscopic description to the resonance fluorescence of a two-level system under ultra-strong laser driving. It is revealed that, different from the standard Mollow triplet structure manifesting the dressed state energy structure under the rotating-wave approximation, the fluorescence spectrum shows a multi-peaks structure with high order harmonics. It is remarkable to find that such multiple peaks directly reflect the transition energies between different Floquet states of the periodically driven system. It paves the way to detect the Floquet states of matter by the resonance fluorescence technique.

Time: 05/23 (Mon) 10:00am

Venue: Physics building 323, CTP-SCU