Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 16: Ultrafast Phenoma II
HL 16.2: Vortrag
Montag, 20. März 2017, 15:15–15:30, POT 51
Impact of the electronic band structure in high-harmonic generation spectra of solids — •Nicolas Tancogne-Dejean1, Oliver D. Mucke2,3, Franz X. Kartner2,3,4,5, and Angel Rubio1,2,4 — 1Max Planck Institute for the Structure and Dynamics of Matter and ETSF, Luruper Chaussee 149, 22761 Hambourg, Germany — 2Center of Free-Electron Laser Science, DESY, Notkestrasse 85, 22607 Hamburg, Germany — 3The Hamburg Center of Ultrafast Imaging, Luruper Chaussee 149, 22761 Hambourg, Germany — 4Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hambourg, Germany — 5Research Laboratory of Electronics, Massachusetts Institute of Thechnology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
An accurate analytic model describing high-harmonic generation (HHG) in solids is derived. Extensive first-principles simulations within a time-dependent density-functional framework corroborate the conclusions of the model. Our results reveal that: (i) the emitted HHG spectra are highly anisotropic and laser-polarization dependent even for cubic crystals, (ii) the harmonic emission is enhanced by the inhomogeneity of the electron-nuclei potential, the yield is increased for heavier atoms, and (iii) the cutoff photon energy is driver-wavelength independent. Moreover, we show that it is possible to predict the laser polarization for optimal HHG in bulk crystals solely from the knowledge of their electronic band structure. Our results pave the way to better control and optimize HHG in solids by engineering their band structure.