Multi-Dimensional Coherent Spectroscopy of Light-Driven States and their Collective Modes in Multi-Band Superconductors
arXiv (Cornell University)(2023)
摘要
We present a comprehensive theory of light-controlled multi-band
superconductivity and apply it to predict distinctive signatures of
light-driven superconducting (SC) states in terahertz multi-dimensional
coherent spectroscopy (THz-MDCS) experiments. We first derive gauge-invariant
Maxwell-Bloch equations for multi-band BCS superconductors. For this, we go
beyond previously considered Anderson pseudo-spin precession models to include
quantum transport effects. By calculating the THz-MDCS spectra measured
experimentally, we then identify unique signatures of finite-momentum
Cooper-pairing states that live longer than the laser pulse. These
non-equilibrium SC states are characterized by long-lived canting of Anderson
pseudo-spins. The pseudo-spin oscillators that describe the properties of these
SC states are parametrically driven by both finite-momentum Cooper pairing and
by time oscillations of the order parameter relative phase. We show that such
strong parametric driving leads to drastic changes in the THz-MDCS spectral
shape from the predictions of third-order nonlinear susceptibility
calculations. These spectral changes strongly depend on the
interband-to-intraband interaction ratio and on the collective modes of the
light-driven state.
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关键词
spectroscopy,collective modes,multi-dimensional,light-driven,multi-band
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