Article (Scientific journals)
Impact of many-body effects on Landau levels in graphene
Sonntag, Jens; Reichardt, Sven; Wirtz, Ludger et al.
2018In Physical Review Letters, 120 (18), p. 187701
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Keywords :
Electron-phonon coupling; Raman Spectroscopy; Graphene
Abstract :
[en] 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 magnetophonon resonances, we extract the charge carrier density dependence of the Landau level transition energies and the associated effective Fermi velocity vF. In contrast to the logarithmic divergence of vF at zero magnetic field, we find a piecewise linear scaling of vF as a function of the 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 ≈6  meV contained in the experimentally extracted Landau level transitions energies.
Disciplines :
Physics
Author, co-author :
Sonntag, Jens
Reichardt, Sven ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Wirtz, Ludger ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Beschoten, Bernd
Katsnelson, Mikhail I.
Libisch, Florian
Stampfer, Christoph
External co-authors :
yes
Language :
English
Title :
Impact of many-body effects on Landau levels in graphene
Publication date :
04 May 2018
Journal title :
Physical Review Letters
ISSN :
1079-7114
Publisher :
American Physical Society, Ridge, United States - New York
Volume :
120
Issue :
18
Pages :
187701
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
FnR Project :
FNR10196198 - Calculation Of Raman Spectra Of Graphene In Various Conditions With A Semi-empirical Approach, 2015 (15/02/2015-31/03/2018) - Sven Reichardt
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