Supplementary Information: Infrared Spectroscopy forDiagnosing Superlattice Minibands in Twisted BilayerGraphene near the Magic-angle
Twisted bilayer graphene (TBG) represents a highly tunable, strongly correlated electron system. However, understanding the single-particle band structure alone has been challenging due to a lack of spectroscopic measurements over a broad energy range. Here, we probe the band structure of TBG around...
| Autores: | , , , , , , , , , , , , , |
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| Tipo de recurso: | conjunto de datos |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:dnet:digitalcsic_::b19c966d22270aa0e01dca7509d9cda4 |
| Acceso en línea: | http://hdl.handle.net/10261/384406 |
| Access Level: | acceso abierto |
| Palabra clave: | wide angular range reveal spectral features intralayer tunneling parameters find good agreement diagnosing superlattice minibands connect spectral features broad energy range twist angle spectroscopic measurements screening heterostructures quantum transport optical fingerprint measurements offer magic angle lattice relaxation interband transitions infrared spectroscopy highly tunable continuum model challenging due better defined band structure analysis suggests |
| Sumario: | Twisted bilayer graphene (TBG) represents a highly tunable, strongly correlated electron system. However, understanding the single-particle band structure alone has been challenging due to a lack of spectroscopic measurements over a broad energy range. Here, we probe the band structure of TBG around the magic angle using infrared spectroscopy and reveal spectral features that originate from interband transitions. In combination with quantum transport, we connect spectral features over a broad energy range (10–700 meV) and track their evolution with the twist angle. We compare our data with calculations of the band structures obtained via the continuum model and find good agreement only when considering a variation of interlayer/intralayer tunneling parameters with the twist angle. Our analysis suggests that the magic angle also shifts due to lattice relaxation and is better defined for a wide angular range of 0.9–1.1°. Additionally, our measurements offer an optical fingerprint of the magic angle for screening heterostructures before nanofabrication. |
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