Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 11: Ultra-fast Phenomena I
HL 11.10: Vortrag
Montag, 17. März 2025, 18:30–18:45, H14
Coherent suppression of high-harmonic generation in Dirac materials — •Wolfgang Hogger1, Alexander Riedel1, Debadrito Roz2, Angelika Knothe1, Cosimo Gorini3, Juan-Diego Urbina1, and Klaus Richter1 — 1Institute for theoretical physics, University of Regensburg, Germany — 2Indian Institute of Science, Bengaluru 560012, India — 3Université Paris-Saclay, CEA, CNRS, SPEC, 91191, Gif-sur-Yvette, France
The study of high-harmonic generation in solids by intense laser pulses provides a fascinating platform for studying ultra-fast electron dynamics and material properties, where the coherent character of the electron dynamics is a central aspect. Starting with the semiconductor Bloch equations, we show the ubiquitous presence of a mechanism suppressing the high harmonic spectrum arising from the coherent superposition of intra- vs inter-band contributions to the total signal [1]. We provide evidence for the generality of this phenomenon by extensive numerical simulations exploring the parameter space of this coherent suppression of high harmonic generation in systems of massive Dirac Fermions (as a prototypical model for topologically non-trivial matter [2]), systems with a pseudo- relativistic dispersion. We supplement our numerical observations with analytical results for a simplified single-mode analysis.
[1] Y. Murakami and M. Sch*uler, Phys. Rev. B 106, 35204 (2022)
[2] C.-X. Liu, X.-L. Qi, H. Zhang, X. Dai, Z. Fang, and S.-C. Zhang, Physical Review B 82, (2010)
Keywords: high harmonic generation; topological insulator; Dirac; semiconductor Bloch equations