We show that, in optical pump-probe experiments on bulk samples, the statistical distribution of the intensity of ultrashort light pulses after 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 photoexcited Peierls material. The transient noise spectroscopy allows us 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.

Probing the Fluctuations of Optical Properties in Time-Resolved Spectroscopy

Randi, Francesco
Membro del Collaboration Group
;
Esposito, Martina
Membro del Collaboration Group
;
Giusti, Francesca
Membro del Collaboration Group
;
Parmigiani, Fulvio
Membro del Collaboration Group
;
Fausti, Daniele
Membro del Collaboration Group
;
2017

Abstract

We show that, in optical pump-probe experiments on bulk samples, the statistical distribution of the intensity of ultrashort light pulses after 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 photoexcited Peierls material. The transient noise spectroscopy allows us 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.
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https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.187403
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2917415
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