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Fingerprints of inelastic transport at the surface of the topological insulator Bi2Se3: Role of electron-phonon coupling

AutorCostache, Marius V. ; Neumann, Ingmar ; Sierra, Juan F. ; Marinova, V.; Gospodinov, M. M.; Roche, Stephan ; Valenzuela, Sergio O.
Fecha de publicación2014
EditorAmerican Physical Society
CitaciónPhysical Review Letters 112(8): 086601 (2014)
ResumenWe 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 ℏΩ ≈ 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. © 2014 American Physical Society.
DescripciónUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).
Versión del editorhttp://dx.doi.org/10.1103/PhysRevLett.112.086601
Identificadoresdoi: 10.1103/PhysRevLett.112.086601
issn: 0031-9007
e-issn: 1079-7114
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