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http://hdl.handle.net/1843/80340| Tipo: | Artigo de Periódico |
| Título: | Observation of well-defined Kohn-anomaly in high-quality graphene devices at room temperature |
| Autor(es): | Andreij de Carvalho Gadelha Rafael Battistella Nadas Tiago Campolina Barbosa Kenji Watanabe Takashi Taniguchi Leonardo Cristiano Campos Markus B. Raschke Ado Jorio de Vasconcelos |
| Resumen: | Due to its ultra-thin nature, the study of graphene quantum optoelectronics, like gate-dependent graphene Raman properties, is obscured by interactions with substrates and surroundings. For instance, the use of doped silicon with a capping thermal oxide layer limited the observation to low temperatures of a well-defined Kohn-anomaly behavior, related to the breakdown of the adiabatic Born–Oppenheimer approximation. Here, we design an optoelectronic device consisting of single-layer graphene electrically contacted with thin graphite leads, seated on an atomically flat hexagonal boron nitride substrate and gated with an ultra-thin gold layer. We show that this device is optically transparent, has no background optical peaks and photoluminescence from the device components, and no generation of laser-induced electrostatic doping (photodoping). This allows for room-temperature gate-dependent Raman spectroscopy effects that have only been observed at cryogenic temperatures so far, above all the Kohn-anomaly phonon energy normalization. The new device architecture, by decoupling graphene optoelectronic properties from the substrate effects, allows for observing quantum phenomena at room temperature. |
| Asunto: | Grafeno Efeito de Raman Optoeletrônica |
| Idioma: | eng |
| País: | Brasil |
| Editor: | Universidade Federal de Minas Gerais |
| Sigla da Institución: | UFMG |
| Departamento: | ICX - DEPARTAMENTO DE FÍSICA |
| Tipo de acceso: | Acesso Restrito |
| Identificador DOI: | https://doi.org/10.1088/2053-1583/ac8e7f |
| URI: | http://hdl.handle.net/1843/80340 |
| Fecha del documento: | 2022 |
| metadata.dc.url.externa: | https://iopscience.iop.org/article/10.1088/2053-1583/ac8e7f |
| metadata.dc.relation.ispartof: | 2D Materials |
| Aparece en las colecciones: | Artigo de Periódico |
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