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O: Fachverband Oberflächenphysik
O 8: Ultrafast Electron Dynamics at Surface and Interfaces I
O 8.9: Vortrag
Montag, 27. März 2023, 12:30–12:45, TRE Phy
Field-induced ultrafast modulation of Rashba coupling in ferroelectric α-GeTe(111) — Geoffroy Kremer1, 2, Julian Maklar3, Laurent Nicolaï4, •Chris W. Nicholson1, 3, 5, Changming Yue1, Caio Silva3, Philipp Werner1, J. Hugo Dil6, 7, Juraj Krempaský6, Gunther Springholz8, Ralph Ernstorfer3, 9, Jan Minár4, Laurenz Rettig3, and Claude Monney1 — 1Université de Fribourg, Switzerland — 2Université de Lorraine, France — 3Fritz Haber Institute of the Max Planck Society, Germany — 4University of West Bohemia, Czech Republic — 5SPECS Surface Nano Analysis GmbH, Germany — 6Paul Scherrer Institut, Switzerland — 7EPFL, Lausanne, Switzerland — 8Johannes Kepler Universität, Austria — 9Technische Universität Berlin, Germany
Rashba materials provide an ideal playground for spin-to-charge conversion in prototype devices. I will present our recent time- and angle-resolved photoemission spectroscopy and momentum microscopy results on α-GeTe(111). This is a non-centrosymmetric ferroelectric (FE) semiconductor displaying a giant FE distortion below 700 K, which hosts spin-polarized states that are promising for a new type of highly efficient non-volatile memory device based on switchable polarization. We find a transient modification of the bulk Rashba splitting corresponding to an enhancement of the FE lattice distortion. This enhanced response results from a transient surface photovoltage which induces a delayed displacive excitation of a phonon along the FE distortion direction [1].
[1] Kremer et al, Nature Communications 13, 6396 (2022)