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  Theory of subcycle time-resolved photoemission: Application to terahertz photodressing in graphene

Schüler, M., & Sentef, M. A. (2021). Theory of subcycle time-resolved photoemission: Application to terahertz photodressing in graphene. Journal of Electron Spectroscopy and Related Phenomena, 253: 147121. doi:10.1016/j.elspec.2021.147121.

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 Creators:
Schüler, M.1, Author
Sentef, M. A.2, 3, Author              
Affiliations:
1Stanford Institute for Materials and Energy Sciences (SIMES), SLAC National Accelerator Laboratory, ou_persistent22              
2Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              
3Center for Free Electron Laser Science (CFEL), ou_persistent22              

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Free keywords: Time- and angle-resolved photoemission, Nonequilibrium Green’s functions, Graphene
 Abstract: Motivated by recent experimental progress we revisit the theory of pump–probe time- and angle-resolved photoemission spectroscopy (trARPES), which is one of the most powerful techniques to trace transient pump-driven modifications of the electronic properties. The pump-induced dynamics can be described in different gauges for the light–matter interaction. Standard minimal coupling leads to the velocity gauge, defined by linear coupling to the vector potential. In the context of tight-binding (TB) models, the Peierls substitution is the commonly employed scheme for single-band models. Multi-orbital extensions – including the coupling of the dipole moments to the electric field – have been introduced and tested recently. In this work, we derive the theory of time-resolved photoemission within both gauges from the perspective of nonequilibrium Green’s functions. This approach naturally incorporates the photoelectron continuum, which allows for a direct calculation of the observable photocurrent. Following this route we introduce gauge-invariant expressions for the time-resolved photoemission signal. The theory is applied to graphene pumped with short terahertz pulses, which we treat within a first-principles TB model. We investigate the gauge invariance and discuss typical effects observed in subcycle time-resolved photoemission. Our formalism is an ideal starting point for realistic trARPES simulations including scattering effects.

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Language(s): eng - English
 Dates: 2021-07-012021-03-292021-08-232021-09-252021-12
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: arXiv: 2103.15900
DOI: 10.1016/j.elspec.2021.147121
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Title: Journal of Electron Spectroscopy and Related Phenomena
  Abbreviation : J. Electron Spectrosc. Relat. Phenom.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 253 Sequence Number: 147121 Start / End Page: - Identifier: ISSN: 0368-2048
CoNE: https://pure.mpg.de/cone/journals/resource/954925524767