Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 54: Ultra-fast Phenomena II

HL 54.7: Talk

Thursday, March 20, 2025, 16:45–17:00, H17

Dephasing Effects in High-Harmonic Generation from Solids — •Francisco Navarrete and Dieter Bauer — Institut für Physik, Universität Rostock, 18051 Rostock, Deutschland

In the calculation of high-order harmonic generation (HHG) in solids, introducing a dephasing time is often crucial for accurately reproducing the distinct spectral peaks observed experimentally in the first plateau region [1,2]. In this contribution, we present analytical and numerical studies on the non-integer contributions to the interband HHG spectrum and investigate how dephasing affects not only the spectral structure but also the amplitude and wavelength dependence of the harmonics. Using a simplified two-band model, we numerically solve and also approximate the semiconductor Bloch equations via a saddle-point method [3] to elucidate these effects. Our findings provide closed analytical expressions for these contributions, offering insights into the interplay between dephasing and electron dynamics in solids and the mechanisms shaping the HHG spectrum.

References:

[1] Vampa et al., Phys. Rev. Lett. 113, 073901 (2014)

[2] Cavaletto et al., Nat. Rev. Phys. (2024) (accepted)

[3] Navarrete et al., Phys. Rev. A 100, 033405 (2019)

Keywords: HHG; strong-field; dephasing; interband