Momentum-resolved spin dynamics of bulk and surface excited States in the topological insulator Bi(2)Se(3)

Physical Review Letters
C CachoF Parmigiani

Abstract

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 Bi_{2}Se_{3}. 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.

References

May 2, 2009·The Review of Scientific Instruments·Céphise M CachoFulvio Parmigiani
Dec 6, 2011·Nature Nanotechnology·J W McIverN Gedik
Mar 4, 2014·Physical Review Letters·Z-H ZhuA Damascelli
Mar 4, 2014·Nature Communications·Zhuojin XieX J Zhou

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Citations

Oct 16, 2016·Nature Communications·Chris JozwiakAlessandra Lanzara
Jul 21, 2016·Nature Communications·N OgawaY Tokura
May 11, 2019·Physical Review Letters·H SoiferZ-X Shen
Aug 8, 2015·Physical Review Letters·S TognoliniS Pagliara
Jul 29, 2017·Physical Review Letters·Liang SiKarsten Held
Oct 30, 2015·Scientific Reports·F BoschiniM Münzenberg
Dec 21, 2016·Nature Communications·J D RameauU Bovensiepen
Jul 4, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Alexander LópezBenjamin Santos

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