Coherent ultrafast spin-dynamics probed in three dimensional topological insulators
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Boschini-2015-Coherent ultrafast.pdf
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Author(s)
Boschini, F.
Mansurova, M.
Mussler, G.
Kampmeier, J.
Braun, L.
Dallera, C.
Carpene, E.
Franz, C.
Czerner, M.
Heiliger, C.
Date Issued
October 2015
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Boschini, F., M. Mansurova, G. Mussler, J. Kampmeier, D. Grutzmacher, L. Braun, F. Katmis, et al. “Coherent Ultrafast Spin-Dynamics Probed in Three Dimensional Topological Insulators.” Scientific Reports 5 (October 29, 2015): 15304.
Version
Final published version
Abstract
Topological insulators are candidates to open up a novel route in spin based electronics. Different to traditional ferromagnetic materials, where the carrier spin-polarization and magnetization are based on the exchange interaction, the spin properties in topological insulators are based on the coupling of spin- and orbit interaction connected to its momentum. Specific ways to control the spin-polarization with light have been demonstrated: the energy momentum landscape of the Dirac cone provides spin-momentum locking of the charge current and its spin. We investigate a spin-related signal present only during the laser excitation studying real and imaginary part of the complex Kerr angle by disentangling spin and lattice contributions. This coherent signal is only present at the time of the pump-pulses’ light field and can be described in terms of a Raman coherence time. The Raman transition involves states at the bottom edge of the conduction band. We demonstrate a coherent femtosecond control of spin-polarization for electronic states at around the Dirac cone.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
https://doi.org/10.1038/srep15304
