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- W2592030263 abstract "Dirac materials are characterized by energy-momentum relations that resemble those of relativistic massless particles. Commonly denominated Dirac cones, these dispersion relations are considered to be their essential feature. These materials comprise quite diverse examples, such as graphene and topological insulators. Band-engineering techniques should aim to a full control of the parameter that characterizes the Dirac cones: the Fermi velocity. We propose a general mechanism that enables the fine-tuning of the Fermi velocity in Dirac materials in a readily accessible way for experiments. By embedding the sample in a uniform electric field, the Fermi velocity is substantially modified. We first prove this result analytically, for the surface states of a topological insulator/semiconductor interface, and postulate its universality in other Dirac materials. Then we check its correctness in carbon-based Dirac materials, namely graphene nanoribbons and nanotubes, thus showing the validity of our hypothesis in different Dirac systems by means of continuum, tight-binding and ab-initio calculations." @default.
- W2592030263 created "2017-03-16" @default.
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- W2592030263 date "2017-08-14" @default.
- W2592030263 modified "2023-10-18" @default.
- W2592030263 title "Tuning the Fermi velocity in Dirac materials with an electric field" @default.
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- W2592030263 doi "https://doi.org/10.1038/s41598-017-08188-3" @default.
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