Probing the fluctuations of the optical properties in time-resolved spectroscopy

Abstract

We show that, in optical pump-probe experiments on bulk samples, the statistical distribution of the intensity of ultrashort light pulses after the interaction with a nonequilibrium complex material can be used to measure the time-dependent noise of the current in the system. We illustrate the general arguments for a photo-excited Peierls material. The transient noise spectroscopy allows to measure to what extent electronic degrees of freedom dynamically obey the fluctuation-dissipation theorem, and how well they thermalize during the coherent lattice vibrations. The proposed statistical measurement developed here provides a new general framework to retrieve dynamical information on the excited distributions in nonequilibrium experiments which could be extended to other degrees of freedom of magnetic or vibrational origin.

arXiv comment10 pages, 3 figures, journal paper

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• Subcycle Quantum Electrodynamics
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Cited by in corpus (8)

• NESSi: The Non-Equilibrium Systems Simulation package
• Probing eigenstate thermalization in quantum simulators via fluctuation-dissipation relations
• Noise Correlations in time- and angular-resolved photoemission spectroscopy
• Quantum model for Impulsive Stimulated Raman Scattering
• Ultrafast Quantum-path Interferometry Revealing the Generation Process of Coherent Phonons
• Inhomogeneous disordering at a photo-induced charge density wave transition
• Stochastic semiclassical theory for non-equilibrium electron-phonon coupled systems
• Ultrafast pump-probe phase-randomized tomography