Regensburg 2019 – scientific programme
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SYSD: Symposium SKM Dissertation-Prize 2019
SYSD 1: SKM Dissertation Prize
SYSD 1.5: Invited Talk
Monday, April 1, 2019, 10:50–11:10, H2
Lightwave-driven quasiparticle acceleration — •Fabian Langer1, Christoph P. Schmid1, Stefan Schlauderer1, Martin Gmitra1, Jaroslav Fabian1, Philipp Nagler1, Christian Schüller1, Tobias Korn1, Peter G. Hawkins2, Johannes T. Steiner2, Ulrich Huttner2, Stephan W. Koch2, Mackillo Kira3, and Rupert Huber1 — 1University of Regensburg, 93040 Regensburg, Germany — 2University of Marburg, 35032 Marburg, Germany — 3University of Michigan, Ann Arbor, MI 48109, USA
Strong-field light-matter interaction by the electric field of light elevates electronic transport in solids to its intrinsic timescales. Coherent phenomena like Bloch oscillations and the resulting high-order harmonic emission can be driven and controlled in bulk semiconductors, for the first time. Here, we investigate coherent quasiparticle acceleration in semiconductors. We highlight the ballistic dynamics of electrons and holes driven by a strong multi-THz field after optical carrier generation. This scheme allows us to collide a crystal electron with its hole inside the semiconductor in close analogy to the three-step process in high-harmonic generation in gases. Furthermore, we show how quasiparticle acceleration can be extended from controlling the translational motion to changing quantum attributes of the underlying quasiparticles. Electron-hole acceleration in a monolayer of tungsten diselenide can be used to change the valley pseudospin of the electron-hole pair, effectively switching this quantum degree of freedom. This method brings the concepts of valleytronics and potentially quantum information processing to optical cycle scales.