Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 26: Ultra-fast phenomena
HL 26.8: Vortrag
Mittwoch, 14. März 2018, 11:30–11:45, EW 202
Lightwave-driven electron-hole recollisions in layered materials — •Christoph P. Schmid1, Fabian Langer1, Stefan Schlauder1, Philipp Nagler1, Tobias Korn1, Christian Schüller1, Peter G. Hawkins2, Johannes T. Steiner2, Ulrich Huttner2, Stefan W. Koch2, Mackillo Kira3, and Rupert Huber1 — 1University of Regensburg, 93040 Regensburg, Germany — 2University of Marburg, 35032 Marburg, Germany — 3University of Michigan, Ann Arbor, Michigan 48109, USA
Utilizing intense light pulses to realize collisions of valence electrons with their parent ion lies at the heart of high-harmonic generation and attosecond science. In solids, a similarly powerful collider scheme for quasiparticles would be highly desirable. Here, we demonstrate a sub-cycle quasiparticle collider. Electron-hole pairs are resonantly prepared in tungsten diselenide, while phase-controlled multi-THz waveforms accelerate and recollide them. This ballistic dynamics manifests itself in the emission of high-order sidebands, the spectra and sub-cycle time structure of which carry key information about the colliding quasiparticles, such as the excitonic binding energy. We also show that lightwave acceleration can not only change the translational motion of quasiparticles, but even control internal quantum attributes such as the spin and the valley pseudospin. We introduce this new paradigm by demonstrating lightwave-driven intervalley transport of valley-polarized electron-hole pairs in monolayer tungsten diselenide, opening a new pathway towards ultimately fast valleytronics at optical cycle scales.