SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 24: Poster Session: Transport

TT 24.10: Poster

Thursday, September 30, 2021, 13:30–16:00, P

Laser-waveform control of high-harmonic emission - a theoretical analysis — •Jan Wilhelm, Maximilian Graml, Maximilian Nitsch, Patrick Grössing, and Ferdinand Evers — Institute of Theoretical Physics, University of Regensburg

When irradiating solids with a short, i.e. subcycle, laser pulse, the corresponding electric field initiates ultrafast electron dynamics in the material. Fingerprints of it are encoded in the emission spectrum that features high-harmonic generation. High-harmonic emission from a topological insulator has been observed recently in experiment [1] opening a platform to explore topology and quasi-relativistic quantum physics using strong laser fields. Strikingly, the high-harmonic orders can be shifted to non-integer multiples of the driving frequency by varying the carrier-envelope phase (CEP) of the driving field. We theoretically analyze the mechanisms leading to CEP shifts using semiconductor Bloch equations [2-4] finding that an interplay of chirp and CEP of the laser pulse lead to arbitrary CEP shifts.
[1] C. P. Schmid, et al., Nature 593, 385-390 (2021)
[2] W. Schäfer, M. Wegener, Semiconductor Optics and Transport Phenomena, Springer, Berlin (2002)
[3] M. Kira, S. W. Koch, Semiconductor Quantum Optics, Cambridge University Press (2011)
[4] J. Wilhelm, P. Grössing, A. Seith, J. Crewse, M. Nitsch, L. Weigl, C. Schmid, F. Evers, Phys. Rev. B 103, 125419 (2021)