Impact of Many-Body Effects on Landau Levels in Graphene

Abstract

We present magneto-Raman spectroscopy measurements on suspended graphene to investigate the charge carrier density-dependent electron-electron interaction in the presence of Landau levels. Utilizing gate-tunable magneto-phonon resonances, we extract the charge carrier density dependence of the Landau level transition energies and the associated effective Fermi velocity $v_{\mathrm{F}}$. In contrast to the logarithmic divergence of $v_{\mathrm{F}}$ at zero magnetic field, we find a piecewise linear scaling of $v_{\mathrm{F}}$ as a function of charge carrier density, due to a magnetic field-induced suppression of the long-range Coulomb interaction. We quantitatively confirm our experimental findings by performing tight-binding calculations on the level of the Hartree-Fock approximation, which also allow us to estimate an excitonic binding energy of $\approx$ 6 meV contained in the experimentally extracted Landau level transitions energies.

arXiv comment10 pages, 6 figures

References in corpus (32)

• Ultrahigh electron mobility in suspended graphene
• Graphene plasmonics
• Electron-Electron Interactions in Graphene: Current Status and Perspectives
• Dirac cones reshaped by interaction effects in suspended graphene
• Negative local resistance caused by viscous electron backflow in graphene
• Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene
• Non-Fermi liquid behaviour of electrons in the half-filled honeycomb lattice (A renormalization group approach)
• Multicomponent fractional quantum Hall effect in graphene
• Marginal Fermi liquid behavior from 2d Coulomb interaction
• Spin and valley quantum Hall ferromagnetism in graphene
• Tuning quantum non-local effects in graphene plasmonics
• Interaction phenomena in graphene seen through quantum capacitance
• Magnetic oscillations in planar systems with the Dirac-like spectrum of quasiparticle excitations
• Dynamical Flavor Symmetry Breaking by a Magnetic Field in $2+1$ Dimensions
• Many-body interactions in quasi-freestanding graphene
• Quantized Landau level spectrum and its density dependence
• Filling-Factor-Dependent Magnetophonon Resonance in Graphene
• Tuning the electron-phonon coupling in multilayer graphene with magnetic fields
• Magneto-Raman scattering of graphene on graphite: Electronic and phonon excitations
• Interacting Electrons in Graphene: Fermi Velocity Renormalization and Optical Response
• Landau level spectroscopy of electron-electron interactions in graphene
• Observation of magneto-phonon resonance of Dirac fermions in graphite
• Many-body effects in graphene beyond the Dirac model with Coulomb interaction
• Velocity renormalization and anomalous quasiparticle dispersion in extrinsic graphene
• Low B Field Magneto-Phonon Resonances in Single-Layer and Bilayer Graphene
• Raman Spectroscopy of magneto-phonon resonances in Graphene and Graphite
• Raman scattering of graphene based systems in high magnetic fields
• Magneto-optical response of graphene: probing substrate interactions
• Probing the band structure of quadri-layer graphene with magneto-phonon resonance
• Many-body effects of Coulomb interaction on Landau levels in graphene
• Probing electronic lifetimes and phonon anharmonicities in high-quality chemical vapor deposited graphene by magneto-Raman spectroscopy
• Many-body renormalization of Landau levels in graphene due to screened Coulomb interaction

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