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  Optical manipulation of Rashba-split 2-dimensional electron gas

Michiardi, M., Boschini, F., Kung, H.-H., Na, M. X., Dufresne, S. K. Y., Currie, A., et al. (2022). Optical manipulation of Rashba-split 2-dimensional electron gas. Nature Communications, 13(1): 3096, pp. 1-7. doi:10.1038/s41467-022-30742-5.

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Michiardi, M.1, Author           
Boschini, F.2, Author
Kung, H-H2, Author
Na, M. X.2, Author
Dufresne, S. K. Y.2, Author
Currie, A.2, Author
Levy, G.2, Author
Zhdanovich, S.2, Author
Mills, A. K.2, Author
Jones, D. J.2, Author
Mi, J. L.2, Author
Iversen, B. B.2, Author
Hofmann, Ph.2, Author
Damascelli, A.2, Author
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              

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 Abstract: The major challenge for the development of spin based information processing is to obtain efficient ways of controlling spin. Here, Michiardi et al show that the Rashba spin-splitting at the surface of Bi2Se3 topological insulator can be controlled via optical pulses on picosecond timescales.
In spintronics, the two main approaches to actively control the electrons' spin involve static magnetic or electric fields. An alternative avenue relies on the use of optical fields to generate spin currents, which can bolster spin-device performance, allowing for faster and more efficient logic. To date, research has mainly focused on the optical injection of spin currents through the photogalvanic effect, and little is known about the direct optical control of the intrinsic spin-splitting. To explore the optical manipulation of a material's spin properties, we consider the Rashba effect. Using time- and angle-resolved photoemission spectroscopy (TR-ARPES), we demonstrate that an optical excitation can tune the Rashba-induced spin splitting of a two-dimensional electron gas at the surface of Bi2Se3. We establish that light-induced photovoltage and charge carrier redistribution - which in concert modulate the Rashba spin-orbit coupling strength on a sub-picosecond timescale - can offer an unprecedented platform for achieving optically-driven spin logic devices.

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Language(s): eng - English
 Dates: 2022-06-222022-06-22
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 13 (1) Sequence Number: 3096 Start / End Page: 1 - 7 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723