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O: Fachverband Oberflächenphysik
O 19: Clean surfaces I
O 19.6: Vortrag
Montag, 26. März 2012, 18:45–19:00, A 053
k-space microscopy with synchrotron radiation on Ag and Bi2Te3 — •Marten Patt, Vitaliy Feyer, Lukasz Plucinski, Carsten Wiemann, and Claus Michael Schneider — PGI-6, Forschungszentrum Jülich GmbH, Jülich, Germany
Momentum resolved photoelectron detection combined with an imaging energy filter gives access to a robust bandstructure imaging of the full k-space with comparatively short acquisition times. With our NanoESCA installation at the Nanospectroscopy Beamline at the synchrotron ELETTRA (Italy)[1] we combine this method with a microspot refocused synchrotron beam, which provides a defined excitation region (ca. 10 µm). The complete angular distribution of the excited electrons at one kinetic energy is measured parallel in one acquisition with an angular resolution < 0,09 Å−1.
We present results of the well-known Ag (001) single crystal Fermi surface as well as of Bi2Te3, which belongs to a new class of materials: the topological insulators [2]. Clear Dirac cone features are visible. Furthermore, we discuss the possibility of future time-resolved measurements due to the efficiency of this method.
[1] http://www.elettra.trieste.it/beamlines/NASP
[2] J.E. Moore, Nature (London) 464, 194 (2010)