Complex carrier-envelope-phase effect of solid harmonics under nonadiabatic conditions

Wang, Huiqiao; Feng, Yingjie; Fu, Silin; Li, Jinbin; Zhang, Xiao; Du, Hongchuan

doi:10.1103/physreva.99.023406

Cited by 15 publications

(9 citation statements)

References 41 publications

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“…(9)], we perform calculations with a frozen ground-state KS potential, as done in Refs. [15,[35][36][37]39]. Such a frozen-KS-potential approach is typically applicable when the electron density is not significantly changed during the laser pulse and it captures all the independent-electron dynamics [39].…”

Section: B Disorder-induced Changes Of Hhg Spectramentioning

confidence: 99%

“…[15,[35][36][37]39]. Such a frozen-KS-potential approach is typically applicable when the electron density is not significantly changed during the laser pulse and it captures all the independent-electron dynamics [39]. As will be shown below, the second plateau for the disorder-free system, which is a signature of correlatedelectron dynamics [38], cannot be well described within the frozen-KS-potential approach.…”

Section: B Disorder-induced Changes Of Hhg Spectramentioning

confidence: 99%

“…In this work we use a TDDFT model as in Refs. [15,[35][36][37]39,40], which accounts for many interacting electrons, at least on a meanfield level. As will be shown below, this approach allows us to model an imperfect crystal in a straightforward manner, without making additional assumptions.…”

Section: Introductionmentioning

confidence: 99%

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High-order harmonic generation in imperfect crystals

Hansen

Madsen

2019

Phys. Rev. A

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High-order harmonic generation (HHG) in imperfect crystals, where the disorder is modeled by random shifts of the ionic positions, is studied using time-dependent density-functional theory. When irradiated by midinfrared laser pulses, the disorder-free system produces HHG spectra with two plateaus. Compared with the disorder-free system, disordered systems are found to emit suppressed harmonics in the first plateau region and enhanced harmonics in the second plateau region. The suppression of harmonics in the first plateau becomes less pronounced when decreasing the displacement of the nuclei, while the enhancement in the second plateau region is insensitive to the range of the ionic displacement. We have confirmed these findings for many different disordered sample systems and for different laser field strengths. The increase of the HHG signals in the second plateau region is proposed to stem from a change of the dynamics in the system, evidenced by the transition matrix elements between the field-free Kohn-Sham orbitals. In addition, a time-frequency profile of HHG spectra shows that the emission of harmonics is less regular in the time domain for a disordered system than for the disorder-free system.

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Section: B Disorder-induced Changes Of Hhg Spectramentioning

confidence: 99%

Section: B Disorder-induced Changes Of Hhg Spectramentioning

confidence: 99%

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High-order harmonic generation in imperfect crystals

Hansen

Madsen

2019

Phys. Rev. A

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“…Due to its flexibility in constructing self-consistent model systems, this methodology was applied to investigate topological edge effects [51,52] and various types of imperfection effects such as doping [53], disorder [52,54], and vacancies [55]. We note that recently such a finite-system model was also used for studying the carrier-envelope-phase effects [60], for examining the phase invariance of the SBEs [61], and for comparing semiclassical trajectory models [62]. For investigating HHG from an ideal periodic crystal lattice, however, it could be advantageous to extend the finite-system TDDFT model to the infinite periodic limit, as we will do in the present work.…”

Section: Introductionmentioning

confidence: 99%

Crystal-momentum-resolved contributions to multiple plateaus of high-order harmonic generation from band-gap materials

Iravani

Madsen

2020

Phys. Rev. A

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We study the crystal-momentum-resolved contributions to the high-order harmonic generation (HHG) in band-gap materials, and identify the relevant initial crystal momenta for the first and higher plateaus of the HHG spectra. We do so by using a time-dependent density-functional theory model of one-dimensional linear chains. We introduce a self-consistent periodic treatment for the infinitely extended limit of the linear chain model, which provides a convenient way to simulate and discuss the HHG from a perfect crystal beyond the single-active-electron approximation. The multiplateau spectral feature is elucidated by a semiclassical k-space trajectory analysis with multiple conduction bands taken into account. In the considered laser-interaction regime, the multiple plateaus beyond the first cutoff are found to stem mainly from electrons with initial crystal momenta away from the point (k = 0), while electrons with initial crystal momenta located around the point are responsible for the harmonics in the first plateau. We also show that similar findings can be obtained from calculations using a sufficiently large finite model, which proves to mimic the corresponding infinite periodic limit in terms of the band structures and the HHG spectra.

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“…Due to its flexibility in constructing self-consistent model systems, this methodology was applied to investigate topological edge effects [51,52] and various types of imperfection effects such as doping [53], disorder [52,54], and vacancies [55]. We note that recently such a finitesystem model was also used for studying the carrierenvelope-phase effects [60], for examining the phase invariance of the SBEs [61], and for comparing semiclassical trajectory models [62]. For investigating HHG from an ideal periodic crystal lattice, however, it could be advantageous to extend the finite-system TDDFT model to the infinite periodic limit, as we will do in the present work.…”

Section: Introductionmentioning

confidence: 99%

Crystal-momentum-resolved contributions to multiple plateaus of high-order harmonic generation from band-gap materials

Yu,

Iravani,

Madsen

2020

Preprint

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We study the crystal-momentum-resolved contributions to the high-order harmonic generation (HHG) in band-gap materials, and identify the relevant initial crystal momenta for the first and higher plateaus of the HHG spectra. We do so by using a time-dependent density-functional theory model of one-dimensional linear chains. We introduce a self-consistent periodic treatment for the infinitely-extended limit of the linear chain model, which provides a convenient way to simulate and discuss the HHG from a perfect crystal beyond the single-active-electron approximation. The multi-plateau spectral feature is elucidated by a semiclassical k-space trajectory analysis with multiple conduction bands taken into account. In the considered laser-interaction regime, the multiple plateaus beyond the first cutoff are found to stem mainly from electrons with initial crystal momenta away from the Γ point (k = 0), while electrons with initial crystal momenta located around the Γ point are responsible for the harmonics in the first plateau. We also show that similar findings can be obtained from calculations using a sufficiently large finite model, which proves to mimic the corresponding infinite periodic limit in terms of the band structures and the HHG spectra.

show abstract

Complex carrier-envelope-phase effect of solid harmonics under nonadiabatic conditions

Cited by 15 publications

References 41 publications

High-order harmonic generation in imperfect crystals

High-order harmonic generation in imperfect crystals

Crystal-momentum-resolved contributions to multiple plateaus of high-order harmonic generation from band-gap materials

Crystal-momentum-resolved contributions to multiple plateaus of high-order harmonic generation from band-gap materials

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