Parts | Days | Selection | Search | Updates | Downloads | Help
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. Kokh4,5, Oleg E. Tereshchenko5,6, 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.