Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 7: Interaction with strong or short laser pulses

A 7.4: Vortrag

Montag, 11. März 2019, 15:00–15:15, S HS 3 Physik

Floquet-Bloch bands in solid-state high harmonic generation — •Lukas Medišauskas, Ulf Saalmann, and Jan-Michael Rost — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

High harmonic generation (HHG) in solid state materials is conventionally divided into intra- and inter- band contributions. In time-dependent Schrödinger equation (TDSE) calculations, the inter-band high-harmonic spectra is generally unstructured and fast dephasing times have to be included into the calculation to observe well pronounced harmonic peaks.

We analyse solid state HHG in terms of Floquet-Bloch (FB) bands, i.e., the field-dressed bands in the presence of the laser pulse. We show that the harmonic spectra can be split into a contributions from a single FB band and a contributions between two FB bands. The former consists of clean well pronounced odd harmonics. The latter consists of harmonics at positions depending on crystal momenta. Combining the contributions from the whole Brillouin zone leads to a featureless spectra. Finally, we show that the role of dephasing in TDSE simulations is that of suppressing the noisy inter FB band harmonics and leaving only the clean intra FB band harmonics.