Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 100: Correlated Electrons: Other Materials
TT 100.9: Vortrag
Donnerstag, 19. März 2015, 17:15–17:30, H 3005
Angle-resolved photoemission spectroscopy of correlated electron pairs on NiO and CoO — •Michael Huth1, Cheng-Tien Chiang1,2, Andreas Trützschler1,2, Wolf Widdra2,1, Jürgen Kirschner1,2, and Frank O. Schumann1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120, Halle(Saale), Germany — 2Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, D-06120, Halle(Saale), Germany
It is well received that the independent electron approximation breaks down in strongly correlated materials. Therefore there is a keen interest to develop a direct experimental probe to spectroscopically resolve the characteristic feature of electron correlation in those materials. One way is to explore double photoemission (DPE) where an electron pair is emitted by a single photon. We use a laboratory high-order harmonic generation light source and the electrons are detected in coincidence with a pair of time-of-flight spectrometers operated in an angle resolving mode [1]. We present DPE spectra from the valence band of strongly correlated 3d transition metal oxides such as NiO and CoO films and characterize the two-dimensional energy and momentum distributions of the photoelectron pairs. Possible signatures of the electron correlation will be discussed.
[1] Huth, Chiang, Trützschler, Schumann, Kirschner, Widdra, Appl. Phys. Lett. 104, 061602 (2014)