Anomalous Dressing of Dirac Fermions in the Topological Surface State of Bi2Se3, Bi2Te3, and Cu-Doped Bi2Se3
Quasiparticle dynamics on the topological surface state of Bi2Se3, Bi2Te3, and superconducting CuBi2Se3 are studied by 7 eV laser-based angle resolved photoemission spectroscopy. We find strong mode couplings in the Dirac-cone surface states at energies of ∼3 and ∼15–20 meV associated with an e...
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| Other Authors: | , , , , , , , , , |
| Format: | article |
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2013
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| Online Access: | http://hdl.handle.net/10725/16653 https://doi.org/10.1103/PhysRevLett.110.217601 http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.217601 |
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| Summary: | Quasiparticle dynamics on the topological surface state of Bi2Se3, Bi2Te3, and superconducting CuBi2Se3 are studied by 7 eV laser-based angle resolved photoemission spectroscopy. We find strong mode couplings in the Dirac-cone surface states at energies of ∼3 and ∼15–20 meV associated with an exceptionally large coupling constant of ∼3, which is one of the strongest ever reported for any material. This result is compatible with the recent observation of a strong Kohn anomaly in the surface phonon dispersion of Bi2Se3, but it appears that the theoretically proposed “spin-plasmon” excitations realized in helical metals are also playing an important role. Intriguingly, the ∼3 meV mode coupling is found to be enhanced in the superconducting state of CuBi2Se3. |
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