Cyclotron Resonance Study of Monolayer Graphene under Double Moiré Potentials
| Autor: | Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Rai Moriya, Kei Kinoshita, Tomoki Machida, Momoko Onodera |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Electronic correlation Graphene Band gap Mechanical Engineering Cyclotron resonance Bioengineering Fermi energy 02 engineering and technology General Chemistry Landau quantization 021001 nanoscience & nanotechnology Condensed Matter Physics Molecular physics law.invention Magnetic field Crystal law General Materials Science 0210 nano-technology |
| Zdroj: | Nano Letters. 20:4566-4572 |
| ISSN: | 1530-6992 1530-6984 |
| Popis: | We report the first cyclotron resonance study of monolayer graphene under double-moire 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 BCR is entirely different from that of nonaligned monolayer graphene, (2) BCR exhibits strong electron-hole asymmetry, and (3) splitting of BCR 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 moire 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. |
| Databáze: | OpenAIRE |
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