Universität zu Köln

Randi, Francesco, Esposito, Martina, Giusti, Francesca, Misochko, Oleg, Parmigiani, Fulvio, Fausti, Daniele and Eckstein, Martin (2017). Probing the Fluctuations of Optical Properties in Time-Resolved Spectroscopy. Phys. Rev. Lett., 119 (18). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Randi, Francesco UNSPECIFIED UNSPECIFIED UNSPECIFIED Esposito, Martina UNSPECIFIED UNSPECIFIED UNSPECIFIED Giusti, Francesca UNSPECIFIED UNSPECIFIED UNSPECIFIED Misochko, Oleg UNSPECIFIED UNSPECIFIED UNSPECIFIED Parmigiani, Fulvio UNSPECIFIED UNSPECIFIED UNSPECIFIED Fausti, Daniele UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckstein, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-211531
DOI:	10.1103/PhysRevLett.119.187403
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	119
Number:	18
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LATTICE-DYNAMICS; STATISTICS Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21153