Energy band splitting and high-order harmonic generation from a doped semiconductor

Pan, Xue-Fei; Han, Tao; Xia, Chang-Long; Xu, Tongtong; Zhang, Jun; Liu, Xue‐Shen

doi:10.1088/1612-202x/ab44b8

Cited by 7 publications

(7 citation statements)

References 40 publications

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“…Another significant effect of the doping is the appearance of point defects such as vacancies and interstitial sites 28,29 . According to recent theoretical investigations dopant-induced band-gap changes can substantially influence the HHG process [29][30][31][32][33] . In particular, donor-doped materials were theoretically predicted to enhance the HHG yield due to electronic excitation from impurity states 31,33 We here investigate the influence of dopant-induced vacancies on the HHG yield in chromium-doped magnesium oxide (MgO:Cr), which was extensively studied previously using experimental [34][35][36][37] and numerical [38][39][40] methods.…”

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confidence: 99%

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Enhanced extreme ultraviolet high-harmonic generation from chromium-doped magnesium oxide

Nefedova

Fröhlich

Navarrete

et al. 2021

Applied Physics Letters

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High-order harmonic generation (HHG) from crystals is emerging as a new ultrashort source of coherent extreme ultraviolet (XUV) light. Doping the crystal structure can offer a new way to control the source properties. Here, we present a study of HHG enhancement in the XUV spectral region from an ionic crystal, using dopant-induced vacancy defects, driven by a laser centered at a wavelength of 1.55 μm. Our numerical simulations based on solutions of the semiconductor Bloch equations and density-functional theory are supported by our experimental observations and demonstrate an increase in the XUV high harmonic yield from doped bulk magnesium oxide (MgO) compared to undoped MgO, even at a low defect concentration. The anisotropy of the harmonic emission as a function of the laser polarization shows that the pristine crystal's symmetry is preserved. Our study paves the way toward the control of HHG in solids with complex defects caused by transition-metal doping.

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confidence: 99%

“…Other future studies will concentrate on HHG spectroscopy to extract information on the intrinsic properties of light-driven attosecond electron transport 69 . This would create attractive perspectives towards the development of all-solid-state attosecond sources and petahertz electronics [12][13][14][29][30][31][32][33]55 .…”

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confidence: 99%

Enhanced extreme ultraviolet high-harmonic generation from chromium-doped magnesium oxide

Nefedova

Fröhlich

Navarrete

et al. 2021

Applied Physics Letters

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“…Therefore, one can expect substantial changes of the HHG yield due to modifications of the band gap. This fact has recently raised interest among theoretical works on the use of doped materials for the HHG [26][27][28][29] . For instance, the effect of impurity levels on the HHG is discussed in the theoretical investigations exploiting time-dependent density functional theory 27 , where the authors have shown the enhanced HHG yield from the donor-doped material due to the electron tunneling from the impurity states to the conduction band.…”

Section: B Hhg From Solids With Defectsmentioning

confidence: 99%

Enhanced high-harmonic generation from chromium-doped magnesium oxide

Nefedova,

Fröhlich,

Tancogne-Dejean

et al. 2020

Preprint

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High-order harmonic generation (HHG) from crystals offers a new source of coherent extreme ultraviolet (XUV) attosecond radiation. The process is extremely sensitive to the band structure and symmetries. Here, we tailor the high-order harmonic radiation by engineering the band structure of the bulk material using dopant-induced vacancy defects. We provide a comparison of the HHG signal in the XUV domain from undoped bulk magnesium oxide (MgO) to the HHG signal from MgO doped with chromium atoms at sub-percent concentration. We experimentally demonstrate an increase in the HHG efficiency as well as an extension of the highest detectable harmonic order from chromium doped MgO with Mg vacancies below the laser-induced damage threshold. An anisotropy measurement of the harmonic emission as a function of the laser polarization shows that the crystal symmetry is preserved for the case of doped MgO. Using a reasoning based on tunneling theory, we provide an explanation about the HHG efficiency increase in MgO with dopant-induced vacancy defects. Our study paves the way towards the control of the HHG properties in solids with complex defects caused by transition metals doping. As a promising example, the energetic cutoff extension can be applied to control the attosecond emission.

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“…It is due to the high electronic density and periodic structure in crystals [5][6][7]. Some novel phenomena from Block electrons in solids, such as ellipticity dependence [8][9][10], multiplateau structure [11,12] et al, can be found in previous the multi-band systems in periodic potential. The main features of the HHG in solid can be captured by the SBEs model, which can be used to investigate the real systems.…”

Section: Introductionmentioning

confidence: 99%

Exploration of the high-order harmonic generation from periodic potentials by Bohmian trajectories

Pan

et al. 2021

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

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The recombination processes of the electrons in solid are illustrated by solving the time-dependent Schrödinger equation. The results show that the Bohmian trajectories and the time evolution of the electronic probability density agrees very well, which demonstrates that we can use the Bohmian trajectories to investigate the recombination processes of the electrons in solid. We select the region where the probability density of the electron reached the strongest and the weakest as the initial position of the calculated Bohmian trajectories, one can see that the Bohmian trajectories have similar structures. In addition, our results show that the emission time of the solid high-order harmonic generation (HHG) spectra from the time-frequency distribution agrees well with the time that the Bohmian trajectories change direction. By regulating the phase of the electric field, the electrons can move farther, which will result in the broad cutoff of the HHG. We have also demonstrated that the similar structure of the Bohmian trajectories of the solid with a defect for different initial positions disappears due to the broken periodic structure, which further illustrates that the motion processes of the electrons in solid depend on the structure of the solid.

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Energy band splitting and high-order harmonic generation from a doped semiconductor

Cited by 7 publications

References 40 publications

Enhanced extreme ultraviolet high-harmonic generation from chromium-doped magnesium oxide

Enhanced extreme ultraviolet high-harmonic generation from chromium-doped magnesium oxide

Enhanced high-harmonic generation from chromium-doped magnesium oxide

Exploration of the high-order harmonic generation from periodic potentials by Bohmian trajectories

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