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Abstract
We have studied the topological insulator Bi2Te3(111) by means of helium atom scattering. The average electron-phonon coupling λ of Bi2Te3(111) is determined by adapting a recently developed quantum-theoretical derivation of the helium scattering probabilities to the case of degenerate semiconductors. Based on the Debye-Waller attenuation of the elastic diffraction peaks of Bi2Te3(111), measured at surface temperatures between 110 and 355K, we find λ to be in the range of 0.04–0.11. This method allows us to extract a correctly averaged λ and to address the discrepancy between previous studies. The relatively modest value of λ is not surprising even though some individual phonons may provide a larger electron-phonon interaction. Furthermore, the surface Debye temperature of Bi2Te3(111) is determined as ΘD=(81±6)K. The electronic surface corrugation was analyzed based on close-coupling calculations. By using a corrugated Morse potential a peak-to-peak corrugation of 9% of the lattice constant is obtained.
Original language | English |
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Article number | 195401 |
Number of pages | 9 |
Journal | Physical Review B |
Volume | 95 |
Issue number | 19 |
DOIs | |
Publication status | Published - 4 May 2017 |
Fields of Expertise
- Advanced Materials Science
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Dive into the research topics of 'Electron-phonon coupling and surface Debye temperature of Bi2Te3(111) from helium atom scattering'. Together they form a unique fingerprint.Projects
- 2 Finished
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Cluster als Materialbausteine - Clusters as building blocks for new materials - Generation and characterization of nanosized building blocks for new materials: bottom-up formation from single atoms and molecules at low temperature
Mayrhofer-Reinhartshuber, M., Lackner, F., Koch, M. & Ernst, W.
1/11/10 → 31/10/14
Project: Research project