SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 24: Poster Session: Transport
TT 24.11: Poster
Thursday, September 30, 2021, 13:30–16:00, P
High-harmonic geneneration in topological insulator surface states — •Vanessa Junk1, Cosimo Gorini1,2, and Klaus Richter1 — 1Institut für Theoretische Physik, Universität Regensburg, Germany — 2Université Paris-Saclay, CEA, CNRS, SPEC, 91191, Gif-sur-Yvette, France
High-order harmonics are typically generated when matter is interacting with strong-field light. In most materials efficient scattering and dephasing destroy coherences in the emitted spectra. In topological insulator (TI) surface states however, scattering is strongly suppressed. This opens up the possibility to observe signatures of coherent transport.
We present how Berry curvature effects imprint into the dynamics of strong-field light driven electrons in TI surface states. In the semiclassical framework, a non-zero Berry curvature leads to the emergence of a velocity component perpendicular to the external driving. Here, we compare the semiclassical predictions with a full quantum mechanical simulation. The high harmonics spectra we calculate from the dynamics show an alternating polarization as has recently also been observed in experiment [1].
[1] C. Schmid, L. Weigl, P. Grössing, V. Junk, C. Gorini, S. Schlauderer, S. Ito, M. Meierhofer, N. Hofmann, D. Afanasiev, J. Crewse, K. Kokh, O. Tereshchenko, J. Güdde, F. Evers, J. Wilhelm, K. Richter, U. Höfer and R. Huber, Nature 593, 385-390 (2021)