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TT: Fachverband Tiefe Temperaturen

TT 62: Ultrafast Dynamics of Light-Driven Systems

TT 62.6: Talk

Friday, March 31, 2023, 11:00–11:15, HSZ 03

Semi-classical analysis of high harmonic spectra in Dirac materials — •Wolfgang Hogger1, Vanessa Junk1, Alexander Riedel1, Cosimo Gorini2, Juan-Diego Urbina1, and Klaus Richter11Institute for theoretical physics, University of Regensburg, Germany — 2Université Paris-Saclay, CEA, CNRS, SPEC, 91191, Gif-sur-Yvette, France

The study of high-order harmonic generation (HHG) in solids by virtue of intense laser pulses provides a fascinating platform to study ultrafast electron dynamics as well as material properties. We theoretically investigate HHG on the basis of massive Dirac Fermions, serving as a prototypical model for topologically non-trivial matter. The high harmonic spectra resulting from a numerical solution of the equations of motion for the density-matrix are supplemented and compared to a semiclassical saddle-point analysis known as the Lewenstein or simple- man model[1,2]. We demonstrate that HHG can be interpreted as a result of interfering classical trajectories generated at different half-cycles of the laser pulse. A transparent and compact analytical formula for the high harmonic spectrum in the limit of long pulses is provided and discussed regarding the range of its validity as well as corrections arising from short waveforms.
[1] M. Lewenstein, P. Balcou, M. Y. Ivanov, A. L’Huillier, and P. B. Corkum, Phys. Rev. A 49, 2117 (1994)
[2] G. Vampa, C. R. Mcdonald, G. Orlando, D. D. Klug, P. B. Corkum, and T. Brabec, Phys. Rev. Lett. 113, 073901 (2014)

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