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Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 19: Poster I

MA 19.49: Poster

Tuesday, April 1, 2014, 13:00–15:30, P1

Sb2Te3 ultrathin films on Si(111): magnetic surface doping and circular dichroism in angle-resolved photoemission spectroscopy — •M. Eschbach1, M. Patt1, L. Plucinski1, V. Feyer1, G. Mussler2, D. Grützmacher2, and C.M. Schneider11Peter Grünberg Institut PGI-6, FZ Jülich, Germany — 2Peter Grünberg Institut PGI-9, FZ Jülich, Germany

Three-dimensional topological insulators are novel states of quantum matter and are combining an insulating bulk energy gap with conducting Dirac-like states at the surface. These topological surface states (TSS) are due to strong spin-orbit coupling. They are topologically protected against back-scattering by time-reversal symmetry and exhibit a spin-polarized chiral structure. We study epitaxially grown thin films of intrinsically p-type doped Sb2Te3 by means of high-resolution angle- and spin-resolved photoemission spectroscopy. Bulk and surface doping with (non-) magnetic impurities and their influence on the electronic structure and spin polarization of the TSS are characterized in detail. Magnetic impurities should break the time-reversal symmetry which should lead to a bandgap opening close to the Fermi level i.e. a massive Dirac fermion state which should be visible in high-resolution ARPES. Furthermore, at our soft x-ray undulator beamline NanoESCA in ELETTRA/Trieste we perform circular dichroism experiments for different photon energies to indirectly probe the spin texture of the TSS. Subsequently, this data will be correlated to spin-polarized ARPES data measured using a recently developed highly efficient 2-dimensional spin-polarizing electron mirror.

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