Journal
NEW JOURNAL OF PHYSICS
Volume 14, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/14/9/095008
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Funding
- GACR within the ESF EuroGraphene program (EPIGRAT) [P204/10/1020, GRA/10/E006]
- Swiss National Science Foundation (SNSF), through the National Centre of Competence in Research 'Materials with Novel Electronic Properties-MaNEP' [200021-120347]
- EuroMagNETII under the European Union contract [228043]
- DFG
- ESF within the EuroGraphene project GRAPHIC-RF
- European Union within the project ConceptGraphene
- Italian Ministry of Education, University, and Research (MIUR) through the program 'FIRB-Futuro in Ricerca' [RBFR10M5BT]
- Swiss National Science Foundation (SNF) [200021_120347] Funding Source: Swiss National Science Foundation (SNF)
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We report on absolute magneto-transmission experiments on highly doped quasi-free-standing epitaxial graphene targeting the classical-to-quantum crossover of the cyclotron resonance. This study allows us to directly extract the carrier density and also other relevant quantities such as the quasiparticle velocity and the Drude weight, which is precisely measured from the strength of the cyclotron resonance. We find that the Drude weight is renormalized with respect to its non-interacting (or random phase approximation) value and that the renormalization is tied to the quasiparticle velocity enhancement. This finding is in agreement with recent theoretical predictions, which attribute the renormalization of the Drude weight in graphene to the interplay between broken Galilean invariance and electron-electron interactions.
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