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| Pàgina inicial > Articles > Articles publicats > Fingerprints of inelastic transport at the surface of the topological insulator Bi 2 Se 3 : |
| Data: | 2014 |
| Resum: | 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. |
| Ajuts: | 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 |
| Drets: | Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets. |
| Llengua: | Anglès |
| Document: | Article ; recerca ; Versió acceptada per publicar |
| Publicat a: | Physical review letters, Vol. 112, issue 8 (Feb. 2014) , art. 86601, ISSN 1079-7114 |
Postprint 12 p, 487.8 KB |