Photoemission signatures of nonequilibrium carrier dynamics from first principles

Fabio Caruso, Dino Novko, and Claudia Draxl
Phys. Rev. B 101, 035128 – Published 16 January 2020
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Abstract

Time- and angle-resolved photoemission spectroscopy (tr-ARPES) constitutes a powerful tool to inspect the dynamics and thermalization of hot carriers. The identification of the processes that drive the dynamics, however, is challenging even for the simplest systems owing to the coexistence of several relaxation mechanisms. Here, we devise a Green's function formalism for predicting the tr-ARPES spectral function of metals and establish the origin of carrier thermalization. The predictive power of this approach is demonstrated by an excellent agreement with experiments for graphene over timescales ranging from a few tens of femtoseconds up to several picoseconds. Our work provides compelling evidence of a nonequilibrium dynamics dominated by the establishment of a hot-phonon regime.

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  • Received 22 May 2019
  • Revised 3 December 2019

DOI:https://doi.org/10.1103/PhysRevB.101.035128

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Fabio Caruso1, Dino Novko2,3, and Claudia Draxl1

  • 1Institut für Physik and IRIS Adlershof, Humboldt-Universität zu Berlin, Berlin, Germany
  • 2Center of Excellence for Advanced Materials and Sensing Devices, Institute of Physics, Zagreb 10000, Croatia
  • 3Donostia International Physics Center, Donostia-San Sebastián 20018, Spain

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Issue

Vol. 101, Iss. 3 — 15 January 2020

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