期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.086601
关键词
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资金
- European Research Council (ERC) [308023 SPINBOUND]
- MINECO [MAT2010-18065, MAT2012-33911, RYC-2011-08319]
- AGAUR (Beatriu de Pinos program)
- ICREA Funding Source: Custom
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 <(h)over bar>Omega approximate to 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.
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