Model-potential method for high-order harmonic generation in monolayer graphene

Wang, Xin-Qiang; Bian, Xue-Bin

doi:10.1103/physreva.103.053106

Cited by 13 publications

(5 citation statements)

References 35 publications

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“…(2b). This frozen-KS approach has been found to capture basically the same HHG features as the dynamic-KS approach [16], and it implies an independent-electron picture which has been frequently assumed in many studies on HHG in solids based on TDSEs [14,15,33,[47][48][49]. Details of the numerical methods for solving Eq.…”

Section: Theoretical Realizationmentioning

confidence: 99%

Enhanced high-order harmonics through periodicity breaks: from backscattering to impurity states

Yu,

Saalmann,

Rost

2022

Preprint

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Backscattering of delocalized electrons has been recently established [Phys. Rev. A 105, L041101 (2022)] as a mechanism to enhance high-order harmonic generation (HHG) in periodic systems with broken translational symmetry. Here we study this effect for a variable spatial gap in an atomic chain. Propagating the many-electron dynamics numerically, we find enhanced HHG and identify its origin in two mechanisms, depending on the gap size, either backscattering or enhanced tunneling from an impurity state. Since the gapped atomic chain exhibits both impurities and vacancies in a unified setting, it provides insight how periodicity breaks influence HHG in different scenarios.

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Section: Theoretical Realizationmentioning

confidence: 99%

Enhanced high-order harmonics through periodicity breaks: from backscattering to impurity states

Yu,

Saalmann,

Rost

2022

Preprint

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“…With the progress in the intense mid-infrared laser technology [1,2], high-order harmonic generation (HHG) [3][4][5][6][7][8][9][10][11][12][13][14] from solids becomes an active topic for promising to synthesize extreme ultraviolet ultrashort laser sources with high brightness. Besides this, HHG from solids can be used to characterize the atomic or crystal structure [9,12] with a subnanometer spatial scale, retrieve the electronic band structure [3], reconstruct the transition dipole moments of solids [15][16][17], probe the electron dynamics on the attosecond timescale, and so forth.…”

Section: Introductionmentioning

confidence: 99%

Control of high-harmonic generation from periodic asymmetric lattices

Shao

Zhang

Song

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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Periodic asymmetric lattices, viewed from one side to the other, their spatial potential energy are different. This difference affects the electronic structure of valence electrons. Our work shows that pronounced even harmonic signals are observed from periodic asymmetric lattices driven by a multi-cycle pulse field. The phases of the odd and even harmonics driven by parallel and anti-parallel laser polarization directions are compared and show different dependence on laser polarization direction. Moreover, it is found each burst in the synthesized attosecond pulse trains in a periodic asymmetric lattice shows the same carrier-envelope phase. We also show that even-order harmonic efficiency in periodic asymmetric lattices can be enhanced (reduced) by using a multi-cycle driving laser in the presence of a weak terahertz pulse field.

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“…According to a recent experimental study under extreme laser intensity (~ 1 TW cm −2 ) 23 , elliptically polarized excitation can further enhance HHG via efficient pair generation mechanism from light-induced transient band structure modification, which is not possible in the standard re-collision model for the gas phases. Theoretical studies suggest other intriguing pathways available in graphene for HHG processes 22 , 35 – 42 . On the other hand, the interband and intraband transitions in graphene can be drastically controlled by electrostatically injecting carriers 28 , 43 , 44 because the two-dimensional linear band with the high Fermi velocity (~ 10 6 m s −1 ) allows large modification of the chemical potential by small amount of carrier injection.…”

Section: Introductionmentioning

confidence: 99%

Gate-tunable quantum pathways of high harmonic generation in graphene

Cha

Kim

et al. 2022

Nat Commun

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Under strong laser fields, electrons in solids radiate high-harmonic fields by travelling through quantum pathways in Bloch bands in the sub-laser-cycle timescales. Understanding these pathways in the momentum space through the high-harmonic radiation can enable an all-optical ultrafast probe to observe coherent lightwave-driven processes and measure electronic structures as recently demonstrated for semiconductors. However, such demonstration has been largely limited for semimetals because the absence of the bandgap hinders an experimental characterization of the exact pathways. In this study, by combining electrostatic control of chemical potentials with HHG measurement, we resolve quantum pathways of massless Dirac fermions in graphene under strong laser fields. Electrical modulation of HHG reveals quantum interference between the multi-photon interband excitation channels. As the light-matter interaction deviates beyond the perturbative regime, elliptically polarized laser fields efficiently drive massless Dirac fermions via an intricate coupling between the interband and intraband transitions, which is corroborated by our theoretical calculations. Our findings pave the way for strong-laser-field tomography of Dirac electrons in various quantum semimetals and their ultrafast electronics with a gate control.

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Model-potential method for high-order harmonic generation in monolayer graphene

Cited by 13 publications

References 35 publications

Enhanced high-order harmonics through periodicity breaks: from backscattering to impurity states

Enhanced high-order harmonics through periodicity breaks: from backscattering to impurity states

Control of high-harmonic generation from periodic asymmetric lattices

Gate-tunable quantum pathways of high harmonic generation in graphene

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