Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 66: Electronic Structure of Surfaces

O 66.15: Poster

Mittwoch, 18. März 2015, 18:15–21:00, Poster A

Electronic structure of spintronic materials investigated with laser-based high-resolution angle-resolved photoemission — •Pika Gospodaric, Markus Eschbach, Lukasz Plucinski, Ewa Mlynczak, Mathias Gehlmann, Sven Döring, and Claus Michael Schneider — Forschungzentrum Jülich GmbH, Peter Grünberg Institute (PGI-6), 52425 Jülich, Germany

In this contribution we will present the first experimental results obtained with the new setup for high resolution angle resolved photoemission spectroscopy (ARPES) operated with laser light. The existing lab-based ARPES system was upgraded with a 6 eV photon source based on the fourth harmonic generation of fundamental 1.5 eV ultrashort pulsed laser beam from a commercial Ti:Sa oscillator. A small spot size of 100 microns can be achieved on the sample, whereas the short pulses allow time-resolved measurement as a future application. The system offers electronic structure investigation of surfaces with possibility to control the polarization of light and thus enables detection of differential absorption of left and right circular polarized light, i.e. circular dichroism (CD), which can be observed in spin polarized energy bands. Calibrations were performed on Au(111)and Cu(111) single crystal surfaces which exhibit clear parabolic surface states in the center of their Brillouin zone. Investigation of the spin texture of the Dirac cone in the 3D topological insulator Sb2Te3 was performed using CD.