Ellipticity of the harmonic emission from graphene irradiated by a linearly polarized laser

Dong, Fulong; Xia, Qinzhi; Liu, Jie

doi:10.1103/physreva.104.033119

Cited by 23 publications

(6 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But with the advent of graphene and other novel nanostructures, it becomes clear that HHG can be much more efficient in these materials. There are several theoretical investigations devoted to the HHG in graphene [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52], in which the part of predictions validated experimentally [53] and others not yet validated. The importance of Coulomb interaction for HHG in graphene has been theoretically predicted in Ref.…”

Section: Introductionmentioning

confidence: 99%

The saddle-point exciton signature on high harmonic generation in 2D hexagonal nanostructures

Avetissian,

Israelyan,

Matevosyan

et al. 2022

Preprint

View full text Add to dashboard Cite

The disclosure of basic nonlinear optical properties of graphene-like nanostructures with correlated electron-hole nonlinear dynamics over a wide range of frequencies and pump field intensities is of great importance for both graphene fundamental physics and for expected novel applications of 2D hexagonal nanostructures in extreme nonlinear optics. In this paper, the nonlinear interaction of 2D hexagonal nanostructures with the bichromatic infrared driving field taking into account many-body Coulomb interaction, is investigated. Numerical investigation in the scope of the Bloch equations within the Houston basis that take into account e − e and e − h interactions in the Hartree-Fock approximation reveal significant excitonic effects in the high harmonic generation process in 2D hexagonal nanostructures such as graphene and silicene. These excitonic effects emerge due to the correlated electron-hole nonlinear dynamics near the saddle point of the Brillouin zone initiated by the crossed fields of the fundamental pump wave and its second harmonic.

show abstract

Section: Introductionmentioning

confidence: 99%

The saddle-point exciton signature on high harmonic generation in 2D hexagonal nanostructures

Avetissian,

Israelyan,

Matevosyan

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…HHGs of graphene are found to be enhanced by elliptically polarized light [12,[16][17][18] in contrast to the atomic cases. The harmonic ellipticity from graphene irradiated by elliptically [14,19] and linearly [19,20] polarized lasers also is studied, and the apparent elliptic 9th harmonic emission is observed and investigated thoroughly in a linearly polarized laser. In addition, HHGs in the bilayer and twisted bilayer graphene have also been studied [21,22].…”

Section: Introductionmentioning

confidence: 99%

Knee structure in the laser intensity dependence of high-order harmonic generations for graphene

Dong¹,

Liu²

2022

Preprint

Self Cite

View full text Add to dashboard Cite

We investigate the high-order harmonic generations (HHGs) of graphene irradiated by linearly polarized lasers with intensities in a wide range from 10 8 W/cm 2 to 10 13 W/cm 2 . We find a striking knee structure in the laser intensity dependence of HHGs, which consists of a linear growth regime, followed by a plateau of the saturated HHGs, and then a transition to a nonlinear growth. The knee structure is rather universal for the varied harmonic orders and has been certificated by the calculations of two-band density-matrix equations as well as the ab initio calculations of time-dependent density functional theory. Based on the two-band model, we reveal the underlying mechanisms:The behavior of linear growth can be depicted analytically by the perturbative theory of optical conductivity; While, the plateau of saturated HHGs and the transition to a nonlinear growth are caused by the quantum destructive interference and constructive interference of harmonics generated by the electrons corresponding to the lattice momentums around Dirac points and M points in Brillouin zone, respectively. In particular, we find that tuning Fermi energy can effectively alter the knee structure while the profile of the knee structure is not sensitive to the temperature. Our calculations of the third-order harmonic vs. tuning Fermi energy are compared with recent experiment showing a good agreement. Our predicted knee structure and its associated properties are observable with the current experimental techniques.

show abstract

“…As is well studied for graphene the HHG process at Dirac-cone approximation [43][44][45][46][47][48] significantly different from the HHG when electrons can move significantly in the Brillouin zone, here polarization and optical anisotropy effects of HHG in graphene arise [49][50][51][52][53][54][55][56][57]. The HHG in WSM with particular lattice realization theoretically is studied in Ref.…”

Section: Introductionmentioning

confidence: 99%

High-order harmonic generation in three-dimensional Weyl semimetals

Avetissian¹,

Avetisyan²,

Avchyan³

et al. 2022

Preprint

View full text Add to dashboard Cite

In this paper, the nonlinear interaction of Weyl semimetal (WSM) with a strong driving electromagnetic wave-field is investigated. In the scope of the structure-gauge invariant low-energy nonlinear electrodynamic theory, the polarization-resolved high-order harmonic generation spectra in WSM are analyzed. The obtained results show that the spectra in WSM are completely different compared to 2D graphene case. In particular, at the non-collinear arrangement of the electric and Weyl nodes' momentum separation vectors, an anomalous harmonics are generated which are polarised perpendicular to the pump wave electric field. The intensities of anomalous harmonics are quadratically dependent on the momentum space separation of the Weyl nodes. If the right and the left Weyl fermions are merged, we have a 4-component trivial massless Dirac fermion and, as a consequence, the anomalous harmonics vanish. In contrast to the anomalous harmonics, the intensities of normal harmonics do not depend on the Weyl nodes' momentum separation vector, and the harmonics spectra resemble the picture for a massless 3D Dirac fermion.

show abstract

Ellipticity of the harmonic emission from graphene irradiated by a linearly polarized laser

Cited by 23 publications

References 48 publications

The saddle-point exciton signature on high harmonic generation in 2D hexagonal nanostructures

The saddle-point exciton signature on high harmonic generation in 2D hexagonal nanostructures

Knee structure in the laser intensity dependence of high-order harmonic generations for graphene

High-order harmonic generation in three-dimensional Weyl semimetals

Contact Info

Product

Resources

About