Physics – Condensed Matter – Materials Science
Scientific paper
2011-08-11
Phys. Rev. Letts., 107, (2011) 186102
Physics
Condensed Matter
Materials Science
Scientific paper
10.1103/PhysRevLett.107.186102
We report the first measurements of phonon dispersion curves on the (001) surface of the strong three-dimensional topological insulator Bi2Se3. The surface phonon measurements were carried out with the aid of coherent helium beam surface scattering techniques. The results reveal a prominent signature of the exotic metallic Dirac fermion quasi-particles, including a strong Kohn anomaly. The signature is manifest in a low energy isotropic convex dispersive surface phonon branch with a frequency maximum of 1.8 THz, and having a V-shaped minimum at approximately 2kF that defines the Kohn anomaly. Theoretical analysis attributes this dispersive profile to the renormalization of the surface phonon excitations by the surface Dirac fermions. The contribution of the Dirac fermions to this renormalization is derived in terms of a Coulomb-type perturbation model.
Chamon Claudio
Chikara S.
Chou Fang-Chieh
El-Batanouny Michael
Howard Candice
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