SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 19: Poster Session IV

HL 19.30: Poster

Thursday, September 30, 2021, 13:30–16:30, P

Non-integer high-harmonic generation in a topological insulator — Christoph P. Schmid¹, Leonard Weigl¹, Patrick Grössing², Vanessa Junk², Cosimo Gorini², Stefan Schlauderer¹, Suguru Ito³, •Manuel Meierhofer¹, Niklas Hofmann¹, Dmytro Afanasiev¹, Jack Crewse², Konstantin A. Kokh^4,5, Oleg E. Tereshchenko^5,6, Jens Güdde³, Ferdinand Evers², Jan Wilhelm², Klaus Richter², Ulrich Höfer³, and Rupert Huber¹ — ¹Institute of Experimental and Applied Physics, University of Regensburg, Germany — ²Institute of Theoretical Physics, University of Regensburg, Germany — ³Department of Physics, Philipps-University of Marburg, Germany — ⁴V.S. Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia — ⁵Novosibirsk State University, Russia — ⁶A.V. Rzhanov Institute of Semiconductor Physics SB RAS, Novosibirsk, Russia

We demonstrate multi-THz high-harmonic generation (HHG) in the topological insulator bismuth telluride. The frequency of the driving field discriminates between HHG from the bulk and the topological surface, where long scattering times and the quasi-relativistic dispersion enable unusually efficient HHG. All observed orders, generated in the surface state, can be continuously shifted to arbitrary non-integer multiples of the driving frequency by varying the carrier-envelope phase of the driving field. The anomalous Berry curvature enforces meandering ballistic trajectories of the Dirac fermions, causing a hallmark HH polarization pattern. Our study provides a fascinating new platform to explore topology and relativistic strong-field quantum physics.