Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.108: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Observation of the topological state and a two-dimensional electron gas in Bi2Se3 by multidimensional photoemission spectroscopy — •Lupulescu C.1,2, Ovsyannikov R.2, Rienks E.D.L.2, Fink J.2, King P.D.C.3, Baumberger F.3, Hatch R.C.4, Hofmann P.4, Mi J.4, Iversen B.B.4, Lindblad A.5, Svensson S.5,6, and Eberhardt W.1,2 — 1Technische Universität Berlin, Berlin, Germany — 2Helmholtz Zentrum Berlin, Berlin, Germany — 3University of St Andrews, St Andrews, UK — 4Aarhus University, Aarhus, Denmark — 5MAX-lab, Lund, Sweden — 6Uppsala University, Uppsala, Sweden
The electronic structure of Bi2Se3 (0001) was investigated using a new time-of-flight angle-resolved electron spectrometer (VG Scienta, ARTOF 10k). Measurements were taken at the 10m NIM beamline of BESSY II, operating in single-bunch mode. Both the topological surface state and a two-dimensional electron gas near the surface were observed. The main advantage of using this type of electron analyzer is the simultaneous mapping of both kinetic energy and angular distribution in two dimensions, ruling out various artefacts induced by sample misalignment, temperature-induced drifts, etc. Moreover, the collection of such data sets is rather fast, so that the temporal evolution of the electronic structure can be studied. Utilizing this, we study the time-dependence of band bending at the surface of Bi2Se3, which leads to the emergence of a two-dimensional electron gas.