Crystal-momentum-resolved contributions to high-order harmonic generation in solids

Francisco Navarrete, Marcelo F. Ciappina, Uwe Thumm

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We analytically and numerically investigate the emission of high-order harmonic radiation from model solids by intense few-cycle midinfrared laser pulses. In single-active-electron approximation, we expand the active electron's wave function in a basis of adiabatic Houston states and describe the solid's electronic band structure in terms of an adjustable Kronig-Penney model potential. For high-order harmonic generation (HHG) from MgO crystals, we examine spectra from two-band and converged multiband numerical calculations. We discuss the characteristics of intra- and interband contributions to the HHG spectrum for computations including initial crystal momenta either from the Γ point at the center of the first Brioullin zone (BZ) only or from the entire first BZ. For sufficiently high intensities of the driving laser field, we find relevant contributions to HHG from the entire first BZ. Based on numerically calculated spectra, we scrutinize the cutoff harmonic orders as a function of the laser peak intensity and find good qualitative agreement with our analytical saddle-point-approximation predictions and published theoretical data.

Original languageEnglish
Article number033405
JournalPhysical Review A
Volume100
Issue number3
DOIs
StatePublished - 9 Sep 2019
Externally publishedYes

Fingerprint Dive into the research topics of 'Crystal-momentum-resolved contributions to high-order harmonic generation in solids'. Together they form a unique fingerprint.

Cite this