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

Journal Article · · Journal of Electron Spectroscopy and Related Phenomena
 [1];  [2]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany)

Here, 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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Alexander von Humboldt Foundation; German Research Foundation (DFG)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1872106
Alternate ID(s):
OSTI ID: 1825126
Journal Information:
Journal of Electron Spectroscopy and Related Phenomena, Journal Name: Journal of Electron Spectroscopy and Related Phenomena Vol. 253; ISSN 0368-2048
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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