Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.097401
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Funding
- FERMI project of Elettra-Sincrotrone Trieste
- Deutsche Forschungsgemeinschaft (DFG) [SPP1666]
- BMBF [05K13WMA]
- CENTEM [CZ.1.05/2.1.00/03.0088]
- Ministry of University and Research [FIRBRBAP045JF2, FIRBRBAP06AWK3]
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The prospect of optically inducing and controlling a spin-polarized current in spintronic devices has generated wide interest in the out-of-equilibrium electronic and spin structure of topological insulators. In this Letter we show that only measuring the spin intensity signal over several orders of magnitude by spin-, time-, and angle-resolved photoemission spectroscopy can provide a comprehensive description of the optically excited electronic states in Bi2Se3. Our experiments reveal the existence of a surface resonance state in the second bulk band gap that is benchmarked by fully relativistic ab initio spin- resolved photoemission calculations. We propose that the newly reported state plays a major role in the ultrafast dynamics of the system, acting as a bottleneck for the interaction between the topologically protected surface state and the bulk conduction band. In fact, the spin- polarization dynamics in momentum space show that these states display macroscopically different temperatures and, more importantly, different cooling rates over several picoseconds.
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