High-order harmonic analysis of anisotropic petahertz photocurrents in solids

Lanin, A. A.; Stepanov, Evgeny A.; Mitrofanov, A. V.; Sidorov‐Biryukov, D. A.; Fedotov, A. B.; Zheltikov, A. M.

doi:10.1364/ol.44.001888

“…IV, we have confirmed that the influence of a band-averaged Berry curvature on the studied odd harmonic is neglible. Too keep our discussion as simple as possible, we will therefore neglect the anomalous velocity term in this paper, which is in agreement with other recent works that utilized this model to study odd orders in solid HHG [23][24][25][26]. Assuming a fully localized electron wave packet at k(t), i.e.…”

Section: A Theoretical Modelmentioning

confidence: 52%

“…It can be expected that electron-electron interactions and the influence of harmonic emission due to electrons that are promoted to the conduction band at different times have a great effect on these kind of maps. Also hole dynamics can be expected to play a role [24]. Discrepancies are therefore not surprising when these effects are neglected.…”

Section: Zinc Sulfidementioning

confidence: 99%

“…Because circularly polarized harmonics from elliptically polarized driving fields have also been demonstrated below the band gap and with a low joint density of states [16], we will focus our attention here on the intraband mechanism. Intraband-only calculations have been successfully utilized to reproduce the linear relationship of the cutoff energy to the driving field [9,21,22], the six-fold rotational symmetry of HHG spectra in the three-fold symmetric crystal GaSe [23], anisotropic HHG emission in ZnSe [24] as well as to reconstruct the band structure [25,26] and the Berry curvature [27] of SiO 2 . However, in solid-state HHG, simplified models that consider only intraband dynamics have so far not been used to study the effects of elliptical polarization.…”

Section: Introductionmentioning

confidence: 99%

“…However, in solid-state HHG, simplified models that consider only intraband dynamics have so far not been used to study the effects of elliptical polarization. It is clear that such a model ignores influences from dephasing [28], wave packet spreading [15], HHG from multiple bands [29], contribution from holes [24], along with effects of the subcycle ionization dynamics [30].…”

Section: Introductionmentioning

confidence: 99%

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Role of intraband dynamics in the generation of circularly polarized high harmonics from solids

Klemke

¹

,

Mücke

²

,

Rubio

³

et al. 2020

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Recent studies have demonstrated that the polarization states of high harmonics from solids can differ from those of the driving pulses. To gain insights on the microscopic origin of this behavior, we perform one-particle intraband-only calculations and reproduce some of the most striking observations. For instance, our calculations yield circularly polarized harmonics from elliptically polarized pulses that sensitively depend on the driving conditions. Furthermore, we perform experiments on ZnS and find partly similar characteristics as reported from silicon. Comparison to our intraband-only calculations shows reasonable qualitative agreement for a below-band-gap harmonic. We show that intraband dynamics predict depolarization effects for higher field strengths. For harmonics above the band gap, interband dynamics become important and the high-harmonic response to elliptical excitation looks systematically different. Our work proposes a method to distinguish between different high-harmonic generation mechanisms and it could pave the way to compact solid-state high-harmonic sources with controllable polarization states.

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“…Because circularly polarized harmonics from elliptically polarized driving fields have also been demonstrated below the band gap and with a low joint density of states [16], we will focus our attention here on the intraband mechanism. Intraband-only calculations have been successfully utilized to reproduce the linear relationship of the cutoff energy to the driving field [9,21,22], the six-fold rotational symmetry of HHG spectra in the three-fold symmetric crystal GaSe [23], anisotropic HHG emission in ZnSe [24] as well as to reconstruct the band structure [25,26] and the Berry curvature [27] of SiO 2 . However, in solid-state HHG, simplified models that consider only intraband dynamics have so far not been used to study the effects of elliptical polarization.…”

Section: Introductionmentioning

confidence: 99%

The role of intraband dynamics in the generation of circularly polarized high harmonics from solids

Klemke,

Tancogne-Dejean,

Rubio

et al. 2020

Preprint

0

View full text Add to dashboard Cite

Recent studies have demonstrated that the polarization states of high harmonics from solids can differ from those of the driving pulses. To gain insights on the microscopic origin of this behavior, we perform one-particle intraband-only calculations and reproduce some of the most striking observations. For instance, our calculations yield circularly polarized harmonics from elliptically polarized pulses that sensitively depend on the driving conditions. Furthermore, we perform experiments on ZnS and find partly similar characteristics as reported from silicon. Comparison to our intraband-only calculations shows reasonable qualitative agreement for a below-band-gap harmonic. We show that intraband dynamics predict depolarization effects for higher field strengths. For harmonics above the band gap, interband dynamics become important and the high-harmonic response to elliptical excitation looks systematically different. Our work proposes a method to distinguish between different high-harmonic generation mechanisms and it could pave the way to compact solid-state high-harmonic sources with controllable polarization states.

show abstract

Unconventional light - matter interaction in the response-time region of unionized bound electrons

Parali

2024

Appl. Phys. B

0

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In the literature, the experimental studies in laser-bound electron interaction without ionization show us that a specific amount of material-dependent response time must already pass so that the conventional interaction starts afterward and the bound electrons sense the electric field being applied to them. On the other hand, due to the lack of this conventional interaction in the mentioned material-specific response-time region, it is not correct to assume that the material is absolutely transparent to the applied field during this time period, in which we hypothesized that there must be an unconventional light-matter interaction phenomenon. We report the first numerical hypothesis for modeling the mechanism of this phenomenon, of which the interaction procedure has not yet been clearly understood. Our hypothesis very simply modifies the interaction Hamiltonian of the system by embedding an unknown time-varying function that we named the modifier function, proposing that it exists only in the response-time region of the material. The numerical solution in this study proved the existence of the modifier function in the response-time region for the first time. In our humble opinion, this proven phenomenon must be studied and understood more clearly both theoretically and experimentally for each material.

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High-order harmonic analysis of anisotropic petahertz photocurrents in solids

Cited by 23 publications

References 25 publications

Role of intraband dynamics in the generation of circularly polarized high harmonics from solids

Role of intraband dynamics in the generation of circularly polarized high harmonics from solids

The role of intraband dynamics in the generation of circularly polarized high harmonics from solids

Unconventional light - matter interaction in the response-time region of unionized bound electrons

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