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O: Fachverband Oberflächenphysik
O 103: Topology and Symmetry Protected Materials I
O 103.3: Vortrag
Donnerstag, 19. März 2020, 11:00–11:15, WIL A317
Room temperature in-situ measurement of the spin voltage of a BiSbTe3 thin film — •Arthur Leis1,2,3, Michael Schleenvoigt2,4, Abdur Rehman Jalil2,4, Vasily Cherepanov1,2, Gregor Mussler2,4, Detlev Grützmacher2,4, F. Stefan Tautz1,2,3, and Bert Voigtländer1,2,3 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany — 3Experimentalphysik IV A, RWTH Aachen University, 52074 Aachen, Germany — 4Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany
One of the hallmarks of topological insulators (TIs), the intrinsic spin polarisation in the topologically protected surface states, is investigated at room temperature in-situ by means of four-probe scanning tunnelling microscopy (STM) for a BiSbTe3 thin film. To achieve the required precision of tip positions for measuring a spin signal, a precise positioning method employing STM scans of the local topography with each individual tip is demonstrated. From the transport measurements, the spin polarisation in the topological surface states (TSS) is estimated as p ∼ 0.3 - 0.6, which is close to the theoretical limit.