Ellipticity dependence transition induced by dynamical Bloch oscillations

Zhang, Xiao; Li, Jinbin; Zhou, Zongsheng; Yue, Shengjun; Du, Hongchuan; Fu, Libin; Luo, Hong‐Gang

doi:10.1103/physrevb.99.014304

Cited by 50 publications

(43 citation statements)

References 52 publications

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“…Nonlinear periodic intraband currents can be driven by strong laser field motion of electrons and holes in the CB and the VB, respectively, resulting in the generation of higher order harmonics of the fundamental laser frequency. Furthermore, higher harmonics can be generated via interband recombination of electrons and holes, leading to emission of quanta with energies determined by the electron-hole momentum at the moment of recombination plus the bandgap energy ( Figure 1 a, lower panel) [ 23 ]. Thus, this mechanism would be responsible for harmonics with energies of quanta larger than the bandgap.…”

Section: Pl and Hhg Emission From Zno Thin Films And Bulkmentioning

confidence: 99%

“…Figure 3 b shows the fit parameters

and

, determined from the fitting procedure of the experimental results measured in the ZnO bulk (red) and thin film (blue) samples as a function of the harmonic order n . Furthermore, fit parameter values—calculated using theoretical models by Liu et al (black) [ 22 ] and Zhang et al (green) [ 23 ]—using a Gaussian fit function

are shown in the upper panel of Figure 3 b. Both theoretical simulations are based on the density matrix equation and the results for the above band gap higher harmonics are interpreted in a frame of the semiclassical saddle-point analysis.…”

Section: Ellipticity Dependence Of Hhgmentioning

confidence: 99%

“…Experimental, as well as theoretical, investigations on ellipticity dependence of HHG in bulk semiconductors were carried out for materials having highly symmetric cubic lattices, such as crystalline Silicon, zinc blend ZnS or cubic MgO [ 19 , 20 , 21 ]. However, in wurtzite lattice materials, like ZnO, the ellipticity dependence were only investigated theoretically so far [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO

et al. 2020

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The generation of high order harmonics from femtosecond mid-IR laser pulses in ZnO has shown great potential to reveal new insight into the ultrafast electron dynamics on a few femtosecond timescale. In this work we report on the experimental investigation of photoluminescence and high-order harmonic generation (HHG) in a ZnO single crystal and polycrystalline thin film irradiated with intense femtosecond mid-IR laser pulses. The ellipticity dependence of the HHG process is experimentally studied up to the 17th harmonic order for various driving laser wavelengths in the spectral range 3–4 µm. Interband Zener tunneling is found to exhibit a significant excitation efficiency drop for circularly polarized strong-field pump pulses. For higher harmonics with energies larger than the bandgap, the measured ellipticity dependence can be quantitatively described by numerical simulations based on the density matrix equations. The ellipticity dependence of the below and above ZnO band gap harmonics as a function of the laser wavelength provides an efficient method for distinguishing the dominant HHG mechanism for different harmonic orders.

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Section: Pl and Hhg Emission From Zno Thin Films And Bulkmentioning

confidence: 99%

“…Figure 3 b shows the fit parameters

and

Section: Ellipticity Dependence Of Hhgmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO

et al. 2020

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“…electron correlation. We predict that eh-PER should be ubiquitous in a large range of extreme nonlinear phenomena of current interest, such as HHG with elliptical drivers [1,3,4,8,27,35,56,57] and systems with large Berry curvatures [58], as well as high-order sideband generation [59][60][61][62]. The identification of eh-PER and its effect on the harmonic emission profiles, as well as the formulation of the ERM, provides new insights into the HHG process in solids and could potentially stimulate new experiments.…”

mentioning

confidence: 93%

Imperfect Recollisions in High-Harmonic Generation in Solids

2020

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We theoretically investigate high-harmonic generation in hexagonal boron nitride with linearly polarized laser pulses. We show that imperfect recollisions between electron-hole pairs in the crystal give rise to an electron-hole-pair polarization energy that leads to a double-peak structure in the subcycle emission profiles. An extended recollision model (ERM) is developed that allows for such imperfect recollisions, as well as effects related to Berry connections, Berry curvatures, and transition-dipole phases. The ERM illuminates the distinct spectrotemporal characteristics of harmonics emitted parallel and perpendicularly to the laser polarization direction. Imperfect recollisions are a general phenomenon and a manifestation of the spatially delocalized nature of the real-space wave packet, they arise naturally in systems with large Berry curvatures, or in any system driven by elliptically polarized light.

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“…Two main theoretical approaches to study HHG in solids include (i) the time-dependent Schrödinger equation (TDSE) for individual Bloch electrons with specific k values [25][26][27][28][29][30][31][32][33][34][35], and (ii) many-electron approaches such as the semiconductor Bloch equations (SBEs) [36][37][38][39][40][41][42][43][44][45][46] and the time-dependent density-functional theory (TDDFT) [23,[47][48][49][50][51][52][53][54][55][56]. In Ref.…”

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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Ellipticity dependence transition induced by dynamical Bloch oscillations

Cited by 50 publications

References 52 publications

Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO

Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO

Imperfect Recollisions in High-Harmonic Generation in Solids

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

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