Using dynamical Hartree-Fock mean-field theory, we study the high harmonic generation (HHG) in fullerene molecules ${\mathrm{C}}_{60}$ and ${\mathrm{C}}_{70}$ under strong pump wave driving. We consider a strong-field regime show that output radiation exhibits multiple plateaus, whose borders are defined by molecular excitonic lines cutoff energies within each plateau scale linearly with field ...

We investigate high-order harmonic generation (HHG) in graphene with a quantum master equation approach. The simulations reproduce the observed enhancement HHG under elliptically polarized light [N. Yoshikawa et al, Science 356, 736 (2017)]. On basis of microscopic decomposition emitted harmonics, we find that originates from an intricate nonlinear coupling between intraband and interband trans...

A coherent-synchrotron-emission regime of forward high-order harmonics generation (HHG) is proposed for the emission an isolated unipolar half-cycle attosecond pulse by a three-color laser impinging on ultrathin foil. theoretical model electron nanobunching mechanism and radiation, which consistent with numerical-simulation results. As HHG does not need to penetrate from front rear side target,...

In strong laser fields, the electron density in solids can show up tidal motions caused by ``pulling'' on electrons, which forms an tide (EDT). However, field processes are always explained single-active-electron (SAE) model and fluctuation of background electrons is neglected previously. Here, we demonstrate induced EDT effect propose a for revealing its role high harmoinc generation (HHG) fro...

We theoretically study the terahertz-induced high-order harmonic generation (HHG) and nonlinear electric transport in graphene based on quantum master equation with relaxation time approximation. To obtain microscopic insight into phenomena, we compare results of fully dynamical calculations those under a quasistatic approximation, where electronic system is approximated as nonequilibrium stead...

The use of ultrashort laser pulses with long wavelengths as drivers is a relevant strategy for scaling high harmonic generation (HHG) to higher photon energies. Here, stimulated Raman scattering enhanced by the formation multidimensional solitary states in molecular gas-filled hollow-core fiber mechanism produce versatile HHG driver reported on. This recently discovered method allows red shift ...

We study high order harmonics generation (HHG) in crystalline silicon and diamond subjected to near mid-infrared laser pulses. employ time-dependent density functional theory solve the Kohn-Sham equation single-cell geometry. demonstrate that clear clean HHG spectra can be generated with careful selection of pulse duration. In addition, we simulate dephasing effects a large super-cell through d...

Potential energy surfaces of electron dynamics (ePES) are constructed from a model localized wave packets (eWP) with non-orthogonal valence-bond (VB) spin coupling and applied to quantum simulations high harmonic generation (HHG) spectra hydrogen helium atoms induced by intense laser pulses. The the single on ePES is calculated numerically solving time-dependent Schrödinger equation. results re...

Abstract Laser-driven light sources in the extreme ultraviolet range (EUV) enable nanoscopic imaging with unique label-free elemental contrast. However, to fully exploit properties of these new sources, novel detection schemes need be developed. Here, we show a proof-of-concept experiment that superconducting nanowire single-photon detectors (SNSPD) can utilized photon counting laser-driven EUV...

Structured light in the short-wavelength regime opens exciting avenues for study of ultrafast spin and electronic dynamics. Here, we demonstrate theoretically experimentally generation vector-vortex beams (VVB) extreme ultraviolet through high-order harmonic (HHG). The up-conversion VVB, which are spatially tailored their orbital angular momentum, is ruled by conservation topological Pancharatn...