Bulk and surface electron dynamics in a p-type topological insulator SnSb2Te4
- Niesner, D.
- Fauster, Th.
- Menshchikova, Tatiana V.
- Eremeev, S. V.
- Aliev, Ziya S.
- Echenique, Pedro M.
- Chulkov, Eugene V.
DOIAbstract
Under the terms of the Creative Commons Attribution License 3.0 (CC-BY).-- et al.Time-resolved two-photon photoemission was used to study the electronic structure and dynamics at the surface of SnSb2Te4, a p-type topological insulator. The Dirac point is found 0.32±0.03 eV above the Fermi level. Electrons from the conduction band minimum are scattered on a time scale of 43±4 fs to the Dirac cone. From there they decay to the partly depleted valence band with a time constant of 78±5 fs. The significant interaction of the Dirac states with bulk bands is attributed to their bulk penetration depth of ∼3 nm as found from density functional theory calculations.We acknowledge partial support from the Basque Country Government, Departamento de Educ...
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