Giant Rashba-Type Spin Splitting in Ferroelectric GeTe(111)

Marcus Liebmann; Christian Rinaldi; Domenico Di Sante; Jens Kellner; Christian Pauly; Rui Ning Wang; Jos Emiel Boschker; Alessandro Giussani; Stefano Bertoli; Matteo Cantoni; Lorenzo Baldrati; Marco Asa; Ivana Vobornik; Giancarlo Panaccione; Dmitry Marchenko; Jaime Sánchez-Barriga; Oliver Rader; Raffaella Calarco; Silvia Picozzi; Riccardo Bertacco; Markus Morgenstern

doi:10.1002/adma.201503459

Giant Rashba-Type Spin Splitting in Ferroelectric GeTe(111)

Adv Mater. 2016 Jan 20;28(3):560-5. doi: 10.1002/adma.201503459. Epub 2015 Nov 24.

Authors

Marcus Liebmann¹, Christian Rinaldi², Domenico Di Sante^{3

4}, Jens Kellner¹, Christian Pauly¹, Rui Ning Wang⁵, Jos Emiel Boschker⁵, Alessandro Giussani⁵, Stefano Bertoli⁶, Matteo Cantoni⁶, Lorenzo Baldrati⁶, Marco Asa⁶, Ivana Vobornik⁷, Giancarlo Panaccione⁷, Dmitry Marchenko⁸, Jaime Sánchez-Barriga⁹, Oliver Rader⁹, Raffaella Calarco⁵, Silvia Picozzi³, Riccardo Bertacco², Markus Morgenstern¹

Affiliations

¹ II. Institute of Physics B and JARA-FIT, RWTH Aachen University, 52074, Aachen, Germany.
² Dipartimento di Fisica, Politecnico di Milano and IFN-CNR, Via Colombo 81, 20133, Milano, Italy.
³ Consiglio Nazionale delle Ricerche CNR-SPIN, UOS L'Aquila, Via Vetoio 10, 67100, L'Aquila, Italy.
⁴ Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio 10, 67100, L'Aquila, Italy.
⁵ Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117, Berlin, Germany.
⁶ Dipartimento di Fisica, Politechnico di Milano, Via Colombo 81, 20133, Milano, Italy.
⁷ Consiglio Nazionale delle Ricerche, CNR - IOM, Laboratorio TASC, 34149, Trieste, Italy.
⁸ Physikalische und Theoretische Chemie, Freie Universität Berlin, Takustraße 3, 14195, Berlin, Germany.
⁹ Helmholtz-Zentrum für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Strasse 15, 12489, Berlin, Germany.

PMID: 26599640
DOI: 10.1002/adma.201503459

Abstract

Photoelectron spectroscopy in combination with piezoforce microscopy reveals that the helicity of Rashba bands is coupled to the nonvolatile ferroelectric polarization of GeTe(111). A novel surface Rashba band is found and fingerprints of a bulk Rashba band are identified by comparison with density functional theory calculations.

Keywords: Rashba effect; ferroelectricity; photoelectron spectroscopy; piezoforce microscopy.