Holography and thermalization in optical pump-probe spectroscopy

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Bagrov , A , Craps , B , Galli , F , Keränen , V , Keski-Vakkuri , E & Zaanen , J 2018 , ' Holography and thermalization in optical pump-probe spectroscopy ' , Physical Review D , vol. 97 , no. 8 , 086005 . https://doi.org/10.1103/PhysRevD.97.086005

Title: Holography and thermalization in optical pump-probe spectroscopy
Author: Bagrov, A.; Craps, B.; Galli, F.; Keränen, V.; Keski-Vakkuri, E.; Zaanen, J.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2018-04-09
Language: eng
Number of pages: 7
Belongs to series: Physical Review D
ISSN: 2470-0010
URI: http://hdl.handle.net/10138/234623
Abstract: Using holography, we model experiments in which a 2 + 1D strange metal is pumped by a laser pulse into a highly excited state, after which the time evolution of the optical conductivity is probed. We consider a finite-density state with mildly broken translation invariance and excite it by oscillating electric field pulses. At zero density, the optical conductivity would assume its thermalized value immediately after the pumping has ended. At finite density, pulses with significant dc components give rise to slow exponential relaxation, governed by a vector quasinormal mode. In contrast, for high-frequency pulses the amplitude of the quasinormal mode is strongly suppressed, so that the optical conductivity assumes its thermalized value effectively instantaneously. This surprising prediction may provide a stimulus for taking up the challenge to realize these experiments in the laboratory. Such experiments would test a crucial open question faced by applied holography: are its predictions artifacts of the large N limit or do they enjoy sufficient UV independence to hold at least qualitatively in real-world systems?
Subject: 114 Physical sciences
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