Many-particle effects in the cyclotron resonance of encapsulated monolayer graphene

Abstract

We study the infrared cyclotron resonance of high mobility monolayer graphene encapsulated in hexagonal boron nitride, and simultaneously observe several narrow resonance lines due to interband Landau level transitions. By holding the magnetic field strength, $B$, constant while tuning the carrier density, $n$, we find the transition energies show a pronounced non-monotonic dependence on the Landau level filling factor, $\nu \propto n/B$. This constitutes direct evidence that electron-electron interactions contribute to the Landau level transition energies in graphene, beyond the single-particle picture. Additionally, a splitting occurs in transitions to or from the lowest Landau level, which is interpreted as a Dirac mass arising from coupling of the graphene and boron nitride lattices.

arXiv commentFinal version post-peer review. Discussion section rewritten for clarity, minor edits made and references added

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Cited by in corpus (15)

• Colossal infrared and terahertz magneto-optical activity in a two-dimensional Dirac material
• Transient lensing from a photoemitted electron gas imaged by ultrafast electron microscopy
• Photo-thermoelectric detection of cyclotron resonance in asymmetrically carrier-doped graphene two-terminal device
• Landau level spectroscopy of PbSnSe topological crystalline insulator
• Many-particle effects in optical transitions from zero-mode Landau levels in HgTe quantum wells
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• Many-body effects on Landau-level spectra and cyclotron resonance in graphene
• Many-body filling-factor dependent renormalization of Fermi velocity in graphene in strong magnetic field
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• Many-body effects, orbital mixing and cyclotron resonance in bilayer graphene
• Observation of quantum oscillations near the Mott-Ioffe-Regel limit in CaAs3
• Infrared spectroscopy of phase transitions in the lowest Landau levels of bilayer graphene
• Landau level spectroscopy in current solid state physics
• Many-body effects in suspended graphene probed through magneto-phonon resonances