Far-from-Equilibrium Electron-Phonon Interactions in Optically Excited Graphene.

Autor: Düvel M; I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany., Merboldt M; I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany., Bange JP; I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany., Strauch H; I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany., Stellbrink M; I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany., Pierz K; Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany., Schumacher HW; Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany., Momeni D; Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany., Steil D; I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany., Jansen GSM; I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany., Steil S; I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany., Novko D; Institute of Physics, HR-10000 Zagreb, Croatia., Mathias S; I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.; International Center for Advanced Studies of Energy Conversion (ICASEC), University of Göttingen, 37077 Göttingen, Germany., Reutzel M; I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
Jazyk: angličtina
Zdroj: Nano letters [Nano Lett] 2022 Jun 22; Vol. 22 (12), pp. 4897-4904. Date of Electronic Publication: 2022 Jun 01.
DOI: 10.1021/acs.nanolett.2c01325
Abstrakt: Comprehending far-from-equilibrium many-body interactions is one of the major goals of current ultrafast condensed matter physics research. Here, a particularly interesting but barely understood situation occurs during a strong optical excitation, where the electron and phonon systems can be significantly perturbed and the quasiparticle distributions cannot be described with equilibrium functions. In this work, we use time- and angle-resolved photoelectron spectroscopy to study such far-from-equilibrium many-body interactions for the prototypical material graphene. In accordance with theoretical simulations, we find remarkable transient renormalizations of the quasiparticle self-energy caused by the photoinduced nonequilibrium conditions. These observations can be understood by ultrafast scatterings between nonequilibrium electrons and strongly coupled optical phonons, which signify the crucial role of ultrafast nonequilibrium dynamics on many-body interactions. Our results advance the understanding of many-body physics in extreme conditions, which is important for any endeavor to optically manipulate or create non-equilibrium states of matter.
Databáze: MEDLINE
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