Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 22: Ultrafast Surface Dynamics
O 22.7: Vortrag
Dienstag, 17. März 2015, 12:15–12:30, MA 042
Polarization dependent photoinduced voltage in Sb2Te3 — •Thomas Schumann1, Maria Mansurova2, Fabio Boschini3, Cinja Seick2, Gregor Mussler4, Tobias Kampfrath5, and Markus Münzenberg1 — 1Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald,Germany — 2I.Physikalisches Institut,Georg-August Universität Göttingen,Germany — 3Dipartimento di Fisica,Politecnico di Milano, Italia — 4Peter-Grünberg Instiut,Forschungszentrum Jülich,Germany — 5Abteilung für Physikalische Chemie,Fritz-Haber-Institut Berlin(MPG),Germany
Topological insulators potentially open up a novel route in spin based electronics. The energy momentum landscape of the Dirac cone provides, via spin-momentum locking, a control of the directionality of spin currents [1]. Its femtosecond control with light pulses has been demonstrated. The used excitations are realized with femtosecond laser pulses (at 1.55 eV) with different pump-pulse polarization. We demonstrate coherent femtosecond control of the dynamics in presence of the pump-pulse and the DC detection of helicity dependent photo currents. Both are compared to possible optical transitions in ab-initio calculations.
Furthermore we thank the DFG-SPP1666.
[1] J. W. McIver et al., Nat. Nanotech. 7, 96(2012)