Dresden 2017 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 10: Focus: Spatio-Temporal Multiscale Optical Spectroscopy Meets Functional Materials
(DF with O, CPP)
DF 10.6: Topical Talk
Wednesday, March 22, 2017, 12:00–12:30, GER 37
Accessing micro- and mesoscopic ultrafast electron dynamics in low-dimensional materials — Michele Puppin1, Christopher Nicholson1, Melanie Müller1, Roman Bertoni1, Hannes Hübener2, Angel Rubio2, Claude Monney3, Cephise Cacho4, Martin Wolf1, Alexander Paarmann1, Laurenz Rettig1, and •Ralph Ernstorfer1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin — 2Max Planck Institute for the Structure and Dynamics of Matter, Hamburg — 3Universität Zürich, CH — 4STFC Rutherford Appleton Laboratory, UK
The coupling of electronic, phononic and spin degrees of freedom is at the heart of most phenomena in condensed matter and governs the flow and relaxation of charge carriers in out-of-equilibrium conditions. Microscopic coupling and correlation effects can be accessed quantitatively by time-, energy- and momentum-resolved information on ultrafast electron dynamics as obtained by time- and angle-resolved photoelectron spectroscopy (trARPES). I will discuss the generation of spin-, valley- and layer-polarized excited states in the semiconductor WSe2 [1], their ultrafast evolution from 2D to 3D states, and the signatures of transient excited-state many-body interactions. In addition, the visualization of the spatio-temporal evolution of photocurrents in a nanowire by means of femtosecond point-projection microscopy will be discussed [2,3].
[1] Bertoni et al., Phys. Rev. Lett., in print, arXiv:1606.03218.
[2] Müller et al., Nature Comm. 5, 5292 (2014).
[3] Müller et al., ACS Photonics 3, 611 (2016).