2017/09/30 by B. Jordan Russell, Boyi Zhou, T. Taniguchi +5
Materials Science · Physics and Astronomy · #Atomic physics #Boron nitride #Condensed matter physics #Cyclotron #Cyclotron resonance #Effective mass (spring–mass system) #Electron #Electron cyclotron resonance #Graphene #Graphene research and applications #Landau quantization #Materials science #Monolayer #Nanotechnology #Physics #Quantum and electron transport phenomena #Quantum mechanics #Resonance (particle physics) #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.120.047401
published as Phys. Rev. Lett. 120, 047401 (2018) · Final version post-peer review. Discussion section rewritten for clarity, minor edits made and references added
openalex publication_date 2018/01/25 · arxiv created 2018/01/26 · arxiv updated 2018/01/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 nonmonotonic dependence on the Landau-level filling factor, ν∝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.