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Field-induced ultrafast modulation of Rashba coupling at room temperature in ferroelectric α-GeTe(111)

Author

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  • Geoffroy Kremer

    (Université de Fribourg
    Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies
    CNRS-Université de Lorraine, Campus ARTEM, 2 allée André Guinier, BP 50840)

  • Julian Maklar

    (Fritz Haber Institute of the Max Planck Society)

  • Laurent Nicolaï

    (New Technologies-Research Center University of West Bohemia)

  • Christopher W. Nicholson

    (Université de Fribourg
    Fritz Haber Institute of the Max Planck Society)

  • Changming Yue

    (Université de Fribourg)

  • Caio Silva

    (Fritz Haber Institute of the Max Planck Society)

  • Philipp Werner

    (Université de Fribourg)

  • J. Hugo Dil

    (Paul Scherrer Institut
    Institute of physics, Ecole Polytechnique Fédérale de Lausanne)

  • Juraj Krempaský

    (Paul Scherrer Institut)

  • Gunther Springholz

    (Johannes Kepler Universität)

  • Ralph Ernstorfer

    (Fritz Haber Institute of the Max Planck Society
    Technische Universität Berlin)

  • Jan Minár

    (New Technologies-Research Center University of West Bohemia)

  • Laurenz Rettig

    (Fritz Haber Institute of the Max Planck Society)

  • Claude Monney

    (Université de Fribourg)

Abstract

Rashba materials have appeared as an ideal playground for spin-to-charge conversion in prototype spintronics devices. Among them, α-GeTe(111) is a non-centrosymmetric ferroelectric semiconductor for which a strong spin-orbit interaction gives rise to giant Rashba coupling. Its room temperature ferroelectricity was recently demonstrated as a route towards a new type of highly energy-efficient non-volatile memory device based on switchable polarization. Currently based on the application of an electric field, the writing and reading processes could be outperformed by the use of femtosecond light pulses requiring exploration of the possible control of ferroelectricity on this timescale. Here, we probe the room temperature transient dynamics of the electronic band structure of α-GeTe(111) using time and angle-resolved photoemission spectroscopy. Our experiments reveal an ultrafast modulation of the Rashba coupling mediated on the fs timescale by a surface photovoltage, namely an increase corresponding to a 13% enhancement of the lattice distortion. This opens the route for the control of the ferroelectric polarization in α-GeTe(111) and ferroelectric semiconducting materials in quantum heterostructures.

Suggested Citation

  • Geoffroy Kremer & Julian Maklar & Laurent Nicolaï & Christopher W. Nicholson & Changming Yue & Caio Silva & Philipp Werner & J. Hugo Dil & Juraj Krempaský & Gunther Springholz & Ralph Ernstorfer & Jan, 2022. "Field-induced ultrafast modulation of Rashba coupling at room temperature in ferroelectric α-GeTe(111)," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33978-3
    DOI: 10.1038/s41467-022-33978-3
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    References listed on IDEAS

    as
    1. J. C. Rojas Sánchez & L. Vila & G. Desfonds & S. Gambarelli & J. P. Attané & J. M. De Teresa & C. Magén & A. Fert, 2013. "Spin-to-charge conversion using Rashba coupling at the interface between non-magnetic materials," Nature Communications, Nature, vol. 4(1), pages 1-7, December.
    2. M. Michiardi & F. Boschini & H.-H. Kung & M. X. Na & S. K. Y. Dufresne & A. Currie & G. Levy & S. Zhdanovich & A. K. Mills & D. J. Jones & J. L. Mi & B. B. Iversen & Ph. Hofmann & A. Damascelli, 2022. "Optical manipulation of Rashba-split 2-dimensional electron gas," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    3. J. Maklar & Y. W. Windsor & C. W. Nicholson & M. Puppin & P. Walmsley & V. Esposito & M. Porer & J. Rittmann & D. Leuenberger & M. Kubli & M. Savoini & E. Abreu & S. L. Johnson & P. Beaud & G. Ingold , 2021. "Nonequilibrium charge-density-wave order beyond the thermal limit," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
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