Ultrafast electron dynamics of graphene quantum dots: High harmonic generation

Gnawali, Suresh; Ghimire, Rupesh; Magar, Krishna Rana; Hossaini, Sayed Jaber; Apalkov, Vadym

doi:10.1103/physrevb.106.075149

Cited by 15 publications

(1 citation statement)

References 62 publications

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“…While numerous studies have extensively employed the TB model and DFT for exploring GQDs, usually these models are applied for the QDs of relatively small sizes, less than 5 nm. The TB model of small GQDs has been applied to study HHG in such systems, where the effect of dephasing on generation of high harmonics has been analyzed [41]. To study the HHG in large QDs with the size of upto 30 nm, the effective low-energy models should be applied.…”

Section: Introductionmentioning

confidence: 99%

High harmonic generation in graphene quantum dots

Zafar,

Mitra,

Apalkov

2024

J. Phys.: Condens. Matter

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We study theoretically the generation of high harmonics in disk graphene quantum dots placed in linearly polarized short pulse.The quantum dots are described within an effective model of the Dirac type and the length gauge was used to describe the interaction of quantum dots with an optical pulse. The generated radiation spectra of graphene quantum dots can be controlled by varying the quantum dot size, i.e., its radius. With increasing the quantum dot radius, the intensities of low harmonics mainly decrease, while the cutoff frequency increases. The sensitivity of the cutoff frequency to the QD size increases with the intensity of the pulse.

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Section: Introductionmentioning

confidence: 99%

High harmonic generation in graphene quantum dots

Zafar,

Mitra,

Apalkov

2024

J. Phys.: Condens. Matter

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High harmonic generation in graphene quantum dots with vacancy defects

Gnawali,

Apalkov

2025

Physica B: Condensed Matter

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Multiphoton excitation and high harmonic generation in rectangular graphene quantum dot

et al. 2023

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The multiphoton excitation and high harmonic generation (HHG) processes are considered using the microscopic quantum theory of nonlinear interaction of strong coherent electromagnetic (EM) radiation with rectangular graphene quantum dot (RGQD). The dynamic Hartree-Fock approximation is developed for the consideration of the quantum dot-laser ﬁeld nonlinear interaction at the nonadiabatic multiphoton excitation regime. The many-body Coulomb interaction is described in the extended Hubbard approximation. By numerical results, we show the signiﬁcance of the RGQD lateral size, shape, and EM waveﬁeld orientation in RGQD of the zigzag edge compear to the armchair edge in the HHG process allowing for increasing the cutoﬀ photon energy and the quantum yield of higher harmonics.

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Ultrafast electron dynamics of graphene quantum dots: High harmonic generation

Cited by 15 publications

References 62 publications

High harmonic generation in graphene quantum dots

High harmonic generation in graphene quantum dots

High harmonic generation in graphene quantum dots with vacancy defects

Multiphoton excitation and high harmonic generation in rectangular graphene quantum dot

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