Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 52: Spintronics (incl. quantum dynamics) (Joint session of HL, MA and TT, organized by MA)
HL 52.2: Vortrag
Mittwoch, 9. März 2016, 09:45–10:00, H32
Giant Rashba-type spin splitting in ferroelectric GeTe(111) — •Marcus Liebmann1, Christian Rinaldi2, Domenico Di Sante3, Jens Kellner1, Christian Pauly1, Rui Ning Wang4, Jos Emiel Boschker4, Alessandro Guissani4, Stefano Bertoli2, Matteo Cantoni2, Lorenzo Baldrati2, Marco Asa2, Ivana Vobornik5, Giancarlo Panaccione5, Dmitry Marchenko6, Jaime Sanchez-Barriga7, Oliver Rader7, Raffaella Calarco4, Silvia Picozzi3, Riccardo Bertacco2, and Markus Morgenstern1 — 1II. Inst. Phys. B, RWTH Aachen University — 2Politecnico di Milano, Italy — 3Consiglio Nazionale delle Ricerche, L’Aquila, Italy — 4Paul-Drude-Institut für Festkörperelektronik, Berlin — 5Consiglio Nazionale delle Ricerche, Trieste, Italy — 6Physikalische und Theoretische Chemie, Freie Universität Berlin — 7Helmholtz-Zentrum für Materialien und Energie, BESSY, Berlin
The ferroelectric semiconductor GeTe has been proposed to exhibit a giant spin splitting of bulk Rashba bands with spin rotation direction coupled to the dielectric polarization [1]. We probe GeTe(111) grown by MBE using in-situ angular-resolved photoelectron spectroscopy (ARPES). We identify a novel Rashba-split surface band with giant spin splitting and find signatures of the bulk Rashba band by comparison with density functional theory calculations [2]. The ferroelectric polarization, as determined by piezo force microscopy, agrees with the predicted helical spin-momentum relation of the Rashba bands.
[1] D. Di Sante et al., Adv. Mater. 25, 509 (2013).
[2] M. Liebmann et al., Adv. Mater. 2015, 10.1002/adma.201503459.