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Journal Article

Probing the Fluctuations of Optical Properties in Time-Resolved Spectroscopy

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Eckstein,  M.
Theory of Correlated Systems out of Equilibrium, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Department of Physics, University of Erlangen-Nürnberg;

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Fulltext (public)

PhysRevLett.119.187403.pdf
(Publisher version), 333KB

Supplementary Material (public)

supplemental.pdf
(Supplementary material), 262KB

Citation

Randi, F., Esposito, M., Giusti, F., Misochko, O., Parmigiani, F., Fausti, D., et al. (2017). Probing the Fluctuations of Optical Properties in Time-Resolved Spectroscopy. Physical Review Letters, 119(18): 187403. doi:10.1103/PhysRevLett.119.187403.


Cite as: http://hdl.handle.net/21.11116/0000-0002-1587-E
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.