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Materials 2017, 10(7), 810; doi:10.3390/ma10070810

Generalized GW+Boltzmann Approach for the Description of Ultrafast Electron Dynamics in Topological Insulators

1
Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria
2
Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany
3
Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
*
Author to whom correspondence should be addressed.
Received: 27 June 2017 / Revised: 27 June 2017 / Accepted: 11 July 2017 / Published: 17 July 2017
(This article belongs to the Special Issue Metal-Insulator Transition)
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Abstract

Quantum-phase transitions between trivial insulators and topological insulators differ from ordinary metal-insulator transitions in that they arise from the inversion of the bulk band structure due to strong spin–orbit coupling. Such topological phase transitions are unique in nature as they lead to the emergence of topological surface states which are characterized by a peculiar spin texture that is believed to play a central role in the generation and manipulation of dissipationless surface spin currents on ultrafast timescales. Here, we provide a generalized G W +Boltzmann approach for the description of ultrafast dynamics in topological insulators driven by electron–electron and electron–phonon scatterings. Taking the prototypical insulator Bi 2 Te 3 as an example, we test the robustness of our approach by comparing the theoretical prediction to results of time- and angle-resolved photoemission experiments. From this comparison, we are able to demonstrate the crucial role of the excited spin texture in the subpicosecond relaxation of transient electrons, as well as to accurately obtain the magnitude and strength of electron–electron and electron–phonon couplings. Our approach could be used as a generalized theory for three-dimensional topological insulators in the bulk-conducting transport regime, paving the way for the realization of a unified theory of ultrafast dynamics in topological materials. View Full-Text
Keywords: topological insulators; ultrafast dynamics; many-body perturbation theory; Boltzmann approach; time- and angle-resolved photoemission spectroscopy topological insulators; ultrafast dynamics; many-body perturbation theory; Boltzmann approach; time- and angle-resolved photoemission spectroscopy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Battiato, M.; Aguilera, I.; Sánchez-Barriga, J. Generalized GW+Boltzmann Approach for the Description of Ultrafast Electron Dynamics in Topological Insulators. Materials 2017, 10, 810.

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