Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 72: Competition for the Gerhard Ertl Young Investigator Award
O 72.2: Vortrag
Donnerstag, 3. April 2014, 11:00–11:30, PHY C 213
Unraveling Elementary Electron Scattering Processes Using Ultrafast Photoemission — •Patrick Kirchmann — Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park CA, USA
Femtosecond time- and angle resolved photoemission spectroscopy is becoming a powerful tool for resolving elementary electron scattering processes directly in the time domain. Measurement of the transient single-particle function grants simultaneous access to single- and many-body information with energy and momentum resolution only few methods can deliver. In this contribution, we highlight these exciting capabilities by discussing (i) quasi-particle lifetimes due to electron-electron scattering in quasi-two-dimensional Pb quantum wells and their relation to Fermi liquid theory [1], (ii) optical excitation pathways and phonon-mediated surface-to-bulk scattering in the topological insulator compound Bi2Se3 [2], and (iii) the collective response of the amplitude mode in the charge density wave compound TbTe3 [3]. These results provide qualitatively new insights into the dynamics of optically excited electrons and the collective response of emergent phases in quantum materials.
[1] Nature Physics 6, 782 (2010)
[2] PRL 108, 117403 (2012); PRL 111, 136802 (2013)
[3] Science 321, 1649 (2008)