نتایج جستجو برای: hhg
تعداد نتایج: 293 فیلتر نتایج به سال:
Edge states play a major role in the electron dynamics of topological insulators as they are only conducting part such materials. In this work we consider Haldane model for two-dimensional insulator, subjected to an intense laser field. We compare numerically simulated high-harmonic generation (HHG) bulk HHG corresponding finite flakes with edge present, and explain differences. particular, pea...
We study high-order harmonic generation (HHG) from aligned molecules in strong elliptically polarized laser fields numerically and analytically. Our simulations show that the spectra polarization of HHG depend strongly on molecular alignment ellipticity. In particular, for small ellipticity, large ellipticity harmonics with high intensity is observed parallel alignment, forming a striking hump ...
High harmonic spectroscopy utilizes the methods of attosecond science to study electronic properties of atoms and molecules. We use a 1.8 μm 11 fs laser source to generate high harmonic spectra beyond 150 eV. The Cooper minimum in krypton is clearly visible in these spectra, and would otherwise be difficult to observe with 800 nm laser sources. We relate the shape of the spectrum to the photoio...
Distinguishing high-harmonic generation from surface and bulk states in topological insulator Bi2Se3
We demonstrated a scheme to differentiate the high-harmonic generation (HHG) originating from surface states and bulk of topological insulator Bi2Se3. By adopting two-color mid-infrared laser fields on Bi2Se3, we found that nonlinear response sensitively depends relative phase driving fields. The even harmonics arise with clear signature, whose modulation period equals cycle second-harmonic (SH...
X-ray free-electron lasers (XFELs) and table-top sources of x-rays based upon high harmonic generation (HHG) have revolutionized the field of ultrafast x-ray atomic and molecular physics, largely due to an explosive growth in capabilities in the past decade. XFELs now provide unprecedented intensity (10W cm) of x-rays at wavelengths down to ∼1 Ångstrom, and HHG provides unprecedented time resol...
Time- and angle-resolved photoemission spectroscopy has played an important role in revealing the non-equilibrium electronic structures of solid-state materials. The implementation high harmonic generation to obtain a higher photon energy also allows us investigate wide Brillouin zone on time scale below 100 fs. In this article, we review our recent studies using high-harmonic-generation-laser-...
We introduce high-harmonic sideband spectroscopy (HHSS) and show that it can be a robust probe of attosecond charge migration (CM) in halogenated carbon-chain molecule. simulate both the CM harmonic-generation (HHG) dynamics using ab initio time-dependent density-functional theory. find initiated along molecular backbone induces sidebands HHG spectrum driven by delayed laser pulse is polarized ...
We experimentally observe longer than long trajectory influence in high-order harmonic generation (HHG) by varying the peak intensity of driving laser field either through direct attenuation or chirping pulse. Using a theoretical Gaussian beam model to simulate spatial interference resulting from quantum path interference, we show that measured patterns cannot be solely explained well-establish...
Over the last decade, the control of atomic-scale electronic motion by optical fields strong enough to mitigate the atomic Coulomb potential has broken tremendous new ground with the advent of phase-controlled high-energy few-cycle pulse sources. Further investigation and control of these physical processes, including high-harmonic generation, ask for the capability of waveform shaping on sub-c...
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