Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 100: Electronic Structure of Surfaces: Spectroscopy, Surface States II
O 100.2: Vortrag
Donnerstag, 23. März 2017, 16:15–16:30, WIL C307
Asymmetric Rashba band topology of Fe films — •Sanjoy Kr Mahatha1, Paolo Moras1, Gustav Bihlmayer2, Polina M Sheverdyaeva1, and Carlo Carbone1 — 1Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy — 2Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
The control and manipulation of the electron spin in a two-dimensional system without the need to apply an external magnetic field is a key topic in condensed matter research aiming at future spintronic devices. In this regard, heterostructures where heavy metal and ferromagnetic layers brought in contact, are attracting increasing interest since the Rashba effect and exchange interaction can together control the electron transport. Electronic spin bands in ferromagnetic metal exhibit exchange energy splitting, while the Rashba spin-orbit effect shifts the spin-polarized bands in k||. The combination of these effects has been realized at the interface of a Fe thin film grown on a W(110) substrate. We find an asymmetry in the band dispersion of Fe quantum well states along structurally equivalent directions, resulting from exchange and spin-orbit effects at the interface and propagating in the whole film.