Impact of Many-Body Effects on Landau Levels in Graphene

被引:24
作者
Sonntag, J. [1 ,2 ,3 ]
Reichardt, S. [1 ,2 ,4 ]
Wirtz, L. [4 ]
Beschoten, B. [1 ,2 ]
Katsnelson, M., I [5 ]
Libisch, F. [6 ]
Stampfer, C. [1 ,2 ,3 ]
机构
[1] Rhein Westfal TH Aachen, JARA FIT, D-52074 Aachen, Germany
[2] Rhein Westfal TH Aachen, Inst Phys 2, D-52074 Aachen, Germany
[3] Forschungszentrum Julich, PGI 9, D-52425 Julich, Germany
[4] Univ Luxembourg, Phys & Mat Sci Res Unit, L-1511 Luxembourg, Luxembourg
[5] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands
[6] Vienna Univ Technol, Inst Theoret Phys, A-1040 Vienna, Austria
基金
欧洲研究理事会; 欧盟地平线“2020”;
关键词
MAGNETO-PHONON RESONANCES; FERMI-LIQUID BEHAVIOR; SUSPENDED GRAPHENE; QUANTUM; PLASMONICS; FIELD;
D O I
10.1103/PhysRevLett.120.187701
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 v(F). In contrast to the logarithmic divergence of v(F) at zero magnetic field, we find a piecewise linear scaling of v(F) 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 approximate to 6 meV contained in the experimentally extracted Landau level transitions energies.
引用
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页数:6
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