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Søren Ulstrup

Momentum-resolved view of highly tunable many-body effects in a graphene/hBN field-effect device

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  • Ryan Muzzio, Carnegie Mellon University
  • ,
  • Alfred J.H. Jones
  • Davide Curcio
  • Deepnarayan Biswas
  • Jill A. Miwa
  • Philip Hofmann
  • Kenji Watanabe, National Institute for Materials Science Tsukuba
  • ,
  • Takashi Taniguchi, National Institute for Materials Science Tsukuba
  • ,
  • Simranjeet Singh, Carnegie Mellon University
  • ,
  • Chris Jozwiak, Advanced Light Source, Berkeley
  • ,
  • Eli Rotenberg, Advanced Light Source, Berkeley
  • ,
  • Aaron Bostwick, Advanced Light Source, Berkeley
  • ,
  • Roland J. Koch, Advanced Light Source, Berkeley
  • ,
  • Søren Ulstrup
  • Jyoti Katoch, Carnegie Mellon University

Integrating the carrier tunability of a functional two-dimensional material electronic device with a direct probe of energy-and momentum-resolved electronic excitations is essential to gain insights on how many-body interactions are influenced during device operation. Here, we use microfocused angle-resolved photoemission in order to analyze many-body interactions in back-gated graphene supported on hexagonal boron nitride. By extracting the doping-dependent quasiparticle dispersion and self-energy, we observe how these interactions renormalize the Dirac cone and impact the electron mobility of our device. Our results are not only limited to a finite energy range around the Fermi level, as in electron transport measurements, but describe interactions on a much wider energy scale, extending beyond the regime of hot carrier excitations.

Original languageEnglish
Article number201409
JournalPhysical Review B
Volume101
Issue20
ISSN2469-9950
DOIs
Publication statusPublished - May 2020

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