Enhancement of the second plateau in solid high-order harmonic spectra by the two-color fields

Li, Jinbin; Zhang, Xiao; Yue, Shengjun; Wu, Hongmei; Hu, Bitao; Du, Hongchuan

doi:10.1364/oe.25.018603

Cited by 63 publications

(34 citation statements)

References 40 publications

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“…More precisely, when the peak intensity of the laser changes by only 40%, the yield of the high order harmonic can be increased by 10–100 times in the energy range of E > 10 eV. Meanwhile, by simply controlling the amplitude ratio of the second beam to the first one, the cutoff of the plateau region can be further extended, showing the possibility to generate isolated attosecond pulses . The phenomena can be attributed to the fact that larger vector potentials are obtained when increasing r 2 coherently.…”

Section: Some Examples Toward Simulating Realistic Systemsmentioning

confidence: 99%

Photoexcitation in Solids: First‐Principles Quantum Simulations by Real‐Time TDDFT

Lian

Guan

et al. 2018

Advcd Theory and Sims

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An efficient and state-of-the-art real-time time-dependent density functional theory (rt-TDDFT) method is presented, as implemented in the time-dependent ab initio package (TDAP), which aims at performing accurate simulations of the interaction between laser fields and solid-state materials. The combination of length-gauge and velocity-gauge electromagnetic field has extended the diversity of materials under consideration, ranging from low dimensional systems to periodic solids. Meanwhile, by employing a local basis presentation, systems of a large size are simulated for long electronic propagation time, with moderate computational cost while maintaining a relatively high accuracy. Non-perturbative phenomena in materials under a strong laser field and linear responses in a weak field can be simulated, either in the presence of ionic motions or not. Several quintessential works are introduced as examples for applications of this approach, including photoabsorption properties of armchair graphene nanoribbon, hole-transfer ultrafast dynamics between MoS 2 /WS 2 interlayer heterojunction, laser-induced nonthermal melting of silicon, and high harmonic generation in monolayer MoS 2 . The method demonstrates great potential for studying ultrafast electron-nuclear dynamics and nonequilibrium phenomena in a wide range of quantum systems.ultrafast dynamics and phenomena either in perturbative or non-perturbative regimes. [3][4][5][6][7][8] Therefore, it has been a unique ab initio quantum method applicable for the exploring of strong field physics beyond linear response theory, for instance, high harmonic generation [9,10] and ultrafast photoelectron emission. [11] Recently, the scope of rt-TDDFT applications has greatly extended from treating isolated atomic and molecular systems to condensed phase materials. In most previous works, numerical implementations of rt-TDDFT that aim at handling solid materials were built on real-space grids, [12,13] including some well-known program packages such as OCTOPUS [9,14] and SALMON. [15,16] Real-time TDDFT has also been implemented in plane wave codes, for example, the ELK FP-LAPW [17] and FPSID, [18] whose encouraging results have shown the effectiveness of the rt-TDDFT approaches. However, if one is interested in high energy excitation that is on the energy scale of tens to hundreds of electron volts (eV), extremely dense real-space grids and high kinetic energy of plane waves are indispensable. Meanwhile, to describe a system with N a atoms, 10 3 to 10 4 × N a real-space grids or plane waves have to be used, which makes the simulation of large-size systems impractical using computer resources available at the present stage. The above two factors will significantly increase the computational cost and in turn limit the practicability of the rt-TDDFT methods.Here we introduce a real-time ab initio approach based on local atomic basis for simulating electron-nuclear dynamics under laser excited conditions. This approach has been successfully implemented in the time-dependent ab initi...

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Section: Some Examples Toward Simulating Realistic Systemsmentioning

confidence: 99%

Photoexcitation in Solids: First‐Principles Quantum Simulations by Real‐Time TDDFT

Lian

Guan

et al. 2018

Advcd Theory and Sims

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“…For populations of C2, they move toward the top of the energy band when the vector potential is decreasing, for the negative correlation between E k 3 and k within the first BZ. When the vector potential is equal to zero, most populations can reach the top of C2 and then transit to C3 regardless of the laser field [29,30]. Population transition between bands 4 and 5 just can happen after the inversion of the driving electric field, which contributes the short trajectory predominantly, as can be seen from figure 3(c).…”

Section: Simulation Results and Discussionmentioning

confidence: 90%

“…Each electron is tunnel ionized to an upper band predominantly at the minimum band gap, e.g., from band 2 to 3 at k=0.0. And population transfer between bands 3 to 4 is mainly at the vicinity of the BZ edge [29][30][31]. For populations of C2, they move toward the top of the energy band when the vector potential is decreasing, for the negative correlation between E k 3 and k within the first BZ.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Single attosecond pulse generation for a dielectric driven by mid-infrared laser field

Jia

Peng

2018

J. Phys. Commun.

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We theoretically investigate the high-order-harmonic generation (HHG) from solids by simulating the dynamics of a single active electron in a dielectric. Interband tunnelling is investigated, by which the harmonic generation can be modeled based on the classical trajectory analysis of electron-hole pairs. The supercontinuum region of the fundamental HHG plateau, whose intensity is about sevenorder magnitude enhancement as compared with that of the second plateau, is used in the generation of isolated attosecond pulses. Thus, it provides us a practical way to increase the conversion efficiency of HHG with laser intensity below the damage threshold.

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“…The HHG with different compositions of the driving laser pulses was addressed also for solid targets and nanostructures considering two distinct regimes. First, if the driving field consists of the fundamental wave and its harmonics [4,24,[49][50][51][52][53][54][55], and second, if one of the involved wave frequencies significantly higher than the other one [2,[56][57][58][59][60][61][62]. Two-color high-order wave mixing research reported so far has mainly been performed for gapped systems.…”

Section: Introductionmentioning

confidence: 99%

Efficient high-harmonic generation in graphene with two-color laser field at orthogonal polarization

Avetissian,

Mkrtchian,

Knorr

2022

Preprint

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High-order frequency mixing in graphene using a two-color radiation field that consisted of the fundamental and the second harmonic fields of an ultrashort linearly polarized laser pulse is studied. It is shown that the harmonics originated from the interband transitions are efficiently generated in the case of the orthogonally polarized two-color field. In this case, the generated high-harmonics are stronger than those obtained in the parallel polarization case by more than two orders of magnitude. This is in sharp contrast with the atomic and semiconductor cases, where the parallel polarization case is more preferable. The physical origin of this enhancement is also deduced from the three-step semi-classical electron-hole collision model, extended to graphene with pseudo-relativistic energy dispersion. We also consider the influence of the many particle Coulomb interaction on the HHG process within dynamical Hartree-Fock approximation. Our analysis shows that in all cases we have an overall enhancement of the HHG signal compared with the free-charged carrier model due to the electron-hole attractive interaction.

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Enhancement of the second plateau in solid high-order harmonic spectra by the two-color fields

Cited by 63 publications

References 40 publications

Photoexcitation in Solids: First‐Principles Quantum Simulations by Real‐Time TDDFT

Photoexcitation in Solids: First‐Principles Quantum Simulations by Real‐Time TDDFT

Single attosecond pulse generation for a dielectric driven by mid-infrared laser field

Efficient high-harmonic generation in graphene with two-color laser field at orthogonal polarization

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