Chirped amplitude mode in photoexcited superconductors

Blommel, Thomas (author), Kaye, Jason (author), Murakami, Yuta (author), Gull, Emanuel (author), Golež, Denis (author)

Using a state-of-the-art numerical scheme, we show that the Higgs mode under excitation exhibits chirped oscillations and exponential decay when fluctuations are included. This is in stark contrast to conventional BCS collisionless dynamics which predict power-law decay and the absence of chirping. The chirped amplitude mode enables us to determine the local modification of the effective potential even when the system is in a long-lived prethermal state. We then show that this chirped amplitude mode is an experimentally observable quantity since the photoinduced (super)current in pump-probe experiments serves as an efficient proxy for the order parameter dynamics, including the chirped dynamics. Our result is based on the attractive Hubbard model using dynamical mean-field theory within the symmetry-broken state after a excitation across the superconducting gap. Since the collective response involves long timescales, we extend the hierarchical low-rank compression method for nonequilibrium Green's functions to symmetry-broken states and show that it serves as an efficient representation despite long-lived memory kernels.

• Language: English
• Keywords: condensed matter physics, superconductivity, light-matter interactions
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2025
• Number of pages: Str. 094502-1-094502-9
• Numbering: Vol. 111, iss. 9
• PID: 20.500.12556/RUL-177293
• UDC: 538.9
• ISSN on article: 2469-9950
• DOI: 10.1103/PhysRevB.111.094502
• COBISS.SI-ID: 262312195
• Publication date in RUL: 19.12.2025

Record is a part of a journal

• Title: Physical review
• Publisher: American Physical Society
• ISSN: 2469-9950
• COBISS.SI-ID: 2997348

Secondary language

• Language: Slovenian
• Keywords: fizika kondenzirane snovi, superprevodnost, interakcije svetloba-snov