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Página principal > Artículos > Artículos publicados > Fingerprints of inelastic transport at the surface of the topological insulator Bi 2 Se 3 : |
Fecha: | 2014 |
Resumen: | We report on electric-field and temperature-dependent transport measurements in exfoliated thin crystals of the Bi2Se3 topological insulator. At low temperatures (<50 K) and when the chemical potential lies inside the bulk gap, the crystal resistivity is strongly temperature dependent, reflecting inelastic scattering due to the thermal activation of optical phonons. A linear increase of the current with voltage is obtained up to a threshold value at which current saturation takes place. We show that the activated behavior, the voltage threshold, and the saturation current can all be quantitatively explained by considering a single optical-phonon mode with energy â Ω≈8 meV. This phonon mode strongly interacts with the surface states of the material and represents the dominant source of scattering at the surface at high electric fields. |
Ayudas: | European Commission 308023 Ministerio de Economía y Competitividad MAT2012-33911 Ministerio de Economía y Competitividad RYC-2011-08319 Ministerio de Economía y Competitividad MAT2010-18065 |
Derechos: | Tots els drets reservats. |
Lengua: | Anglès |
Documento: | Article ; recerca ; Versió acceptada per publicar |
Publicado en: | Physical review letters, Vol. 112, issue 8 (Feb. 2014) , art. 86601, ISSN 1079-7114 |
Postprint 12 p, 487.8 KB |