Cyclotron Resonance Study of Monolayer Graphene under Double Moiré Potentials.
basic_science · Level V
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- Record sourced from PubMed, PMID 32356662.
- Also identified by DOI 10.1021/acs.nanolett.0c01427.
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Abstract
We report the first cyclotron resonance study of monolayer graphene under double-moiré potentials in which the crystal axis of graphene is nearly aligned to those of both the top and bottom hexagonal boron nitride (h-BN) layers. Under mid-infrared light irradiation, we observe cyclotron resonance absorption with the following unique features: (1) cyclotron resonance magnetic field <i>B</i><sub>CR</sub> is entirely different from that of nonaligned monolayer graphene, (2) <i>B</i><sub>CR</sub> exhibits strong electron-hole asymmetry, and (3) splitting of <i>B</i><sub>CR</sub> is observed for |ν| < 1, with the split maximum at |ν| = 1, resulting in eyeglass-shaped trajectories. These features are well explained by considering the large bandgap induced by the double moiré potentials, the electron-hole asymmetry in the Fermi velocity, and the Fermi-level-dependent enhancement of spin gaps, which suggests a large electron-electron correlation contribution in this system.