Chirped amplitude mode in photo-excited superconductors
arxiv(2024)
摘要
We show that the amplitude mode in superconductors exhibits chirped
oscillations under resonant excitation and that the chirping velocity increases
as we approach the critical excitation strength. The chirped amplitude mode
enables us to determine the local modification of the effective potential even
when the system is in a long-lived pre-thermal state. We then show that this
chirped amplitude mode is an experimentally observable quantity since the
photo-induced (super)-current in pump-probe experiments serves as an efficient
proxy for the dynamics of the order parameter, 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 resonant excitation across the
superconducting gap. Since the collective response takes place on emergently
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.
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