Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 78: Electronic Structure of Surfaces I: Photoelectron Spectroscopy
O 78.3: Hauptvortrag
Donnerstag, 4. April 2019, 11:00–11:30, H14
Photoemission of correlated electron pairs from metals excited by megahertz high-order harmonics — •Cheng-Tien Chiang1,2, Andreas Trützschler1,2, Michael Huth2, Robin Kamrla1,2, Frank O. Schumann2, and Wolf Widdra1,2 — 1Institute of Physics, Martin-Luther-Universität Halle-Wittenberg — 2Max-Planck-Institut für Mikrostrukturphysik
Electron correlation has been an important topic of solid state physics, which underlies phenomena ranging from magnetism, superconductivity, to metal-insulator transitions. However, direct spectroscopy of correlated electron pairs in solids is a challenging task. By our recent development of laser-based high-order harmonic generation at megahertz repetition rates [1-3] in combination with a pair of time-of-flight spectrometers [4,5], we resolve interacting electron pairs in metals and oxides, and identify their associated valence band character [6]. Our results indicate a band-dependent electron-electron interaction, and the experiments will pave the way towards time- and angle-resolved photoelectron spectroscopy of electron pairs in solids.
[1] C.-T. Chiang, "Angle-resolved photoelectron spectroscopy at surfaces with high-order harmonic generation", Reference module in chemistry, molecular sciences and chemical engineering, edited by K. Wandelt, Elsevier (2018). [2] C.-T. Chiang et al., New J. Phys. 17, 013035 (2015). [3] C.-T. Chiang et al., J. Electron Spectrosc. Relat. Phenomena, 200, 15 (2015). [4] M. Huth et al., J. Appl. Phys. 124, 164504 (2018). [5] M. Huth et al., App. Phys. Lett. 104, 061602 (2014). [6] A. Trützschler et al., Phys. Rev. Lett. 118, 136401 (2017).