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25 April 2024 |
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Exceptionally Weak Electron-Phonon Coupling on the Surface of the Topological Insulator Bi2Se3 - A Promise for Room Temperature Applications | | Z.-H. Pan
; A. V. Fedorov
; D. Gardner
; Y. S. Lee
; S. Chu
; T. Valla
; | | Date: |
16 Sep 2011 | | Abstract: | Gapless surface states on topological insulators are protected from elastic
scattering on non-magnetic impurities which makes them promising candidates for
low-power electronic applications. However, for wide-spread applications, these
states should have to remain coherent at ambient temperatures. Here, we studied
temperature dependence of the electronic structure and the scattering rates on
the surface of a model topological insulator, Bi2Se3, by high resolution
angle-resolved photoemission spectroscopy. We found an extremely weak
broadening of the topological surface state with temperature and no anomalies
in the state’s dispersion, indicating exceptionally weak electron-phonon
coupling. Our results demonstrate that the topological surface state is
protected not only from elastic scattering on impurities, but also from
scattering on low-energy phonons, suggesting that topological insulators could
serve as a basis for room temperature electronic devices. | | Source: | arXiv, 1109.3638 | | Services: | Forum | Review | PDF | Favorites | |
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