Edge-state and bulklike laser-induced correlation effects in high-harmonic generation from a linear chain

Jensen, Simon Vendelbo Bylling; Madsen, Lars Bojer

doi:10.1103/physrevb.104.054309

Cited by 11 publications

(4 citation statements)

References 72 publications

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“…Hence, our model is self-consistently constructed once the parameters Z, ε, and {x i } are specified. A typical configuration for this model [16,17,30,39,[41][42][43][44][45][46] is a chain with parameters Z = 4, ε = 2.25, and {x i } equally spaced by a lattice constant d = 7. In this work we consider this regular chain configuration as a prototype, and introduce an additional variable gap δ in the center of the chain.…”

Section: Theoretical Realizationmentioning

confidence: 99%

Enhanced high-order harmonics through periodicity breaks: from backscattering to impurity states

Yu,

Saalmann,

Rost

2022

Preprint

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Backscattering of delocalized electrons has been recently established [Phys. Rev. A 105, L041101 (2022)] as a mechanism to enhance high-order harmonic generation (HHG) in periodic systems with broken translational symmetry. Here we study this effect for a variable spatial gap in an atomic chain. Propagating the many-electron dynamics numerically, we find enhanced HHG and identify its origin in two mechanisms, depending on the gap size, either backscattering or enhanced tunneling from an impurity state. Since the gapped atomic chain exhibits both impurities and vacancies in a unified setting, it provides insight how periodicity breaks influence HHG in different scenarios.

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Section: Theoretical Realizationmentioning

confidence: 99%

Enhanced high-order harmonics through periodicity breaks: from backscattering to impurity states

Yu,

Saalmann,

Rost

2022

Preprint

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“…Recently, it was found that an enhancement of the HHG spectrum arises in finite lattices due to electrons backscattering on the edges of the lattice [30]. In the finite-size limit, however, electron-electron correlations are of importance as alluded to in HHG experiments with monolayer materials [21] and predicted for pump-probe HHG [31,32]. To investigate beyond mean-field electronelectron correlations in HHG, several effective Hamiltonian models have been developed and applied [2,[33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Correlation effects in high-harmonic generation from finite systems

Hansen,

Jensen,

Madsen

2022

Preprint

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Using the Hubbard model we study how the process of high-order harmonic generation (HHG) is modified by beyond mean-field electron-electron correlation for both finite and bulk systems. A finite-size enhancement of the HHG signal is found and attributed to electrons backscattering off the lattice edges. Additionally, with increasing strength of the electron-electron correlation an enhancement of the high-frequency regime of the HHG spectrum is found. This is attributed to the on-site Coulomb repulsion between electrons giving rise to a localized quiver motion of the electrons. The finite-lattice enhancement dominates the HHG spectra from a few harmonic orders until a threshold from which the correlational enhancement dominates. This threshold is determined by the degree of correlation and decreases into the low-frequency regime for increasing electron-electron correlation. This infers that as the Mott insulator limit of high electron-electron correlation is approached, the finite-size effect on the electron dynamics becomes negligible.

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“…High-harmonic generation (HHG) [1][2][3][4], i.e. the coherent production of high-energy photons by upconversion of the photon energy of the laser, represents a promising tool to probe the structure [5][6][7][8][9], topology [10][11][12][13][14][15][16], electron-correlation [17][18][19][20][21], and ultrafast electron dynamics [22][23][24] of condensed-matter systems. Recently, it has been proposed that in crystalline systems with a non-vanishing Berry curvature, a laser field can induce a nonlinear anomalous current polarized perpendicular to the laser polarization and lead to the generation of nonperturbative anomalous high harmonics [11,14,15,[25][26][27].…”

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confidence: 99%

Characterizing Anomalous High-Harmonic Generation in Solids

Yue¹,

Gaarde²

2022

Preprint

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Anomalous high-harmonic generation (HHG) arises in certain solids when irradiated by an intense laser field, as the result of a nonlinear perpendicular current akin to a Hall current. Here, we theoretically characterize the anomalous HHG mechanism, via development of an ab-initio methodology for strong-field laser-solid interaction that allows a rigorous decomposition of the total current. We identify two key characteristics of the anomalous harmonic yields: an overall increase with laser wavelength; and pronounced minima at certain intensities or wavelengths around which the emission time profiles drastically change. Such signatures can be exploited to disentangle the anomalous harmonics from the competing interband harmonics, and thus pave way for the experimental identification and time-domain control of pure anomalous harmonics.

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Edge-state and bulklike laser-induced correlation effects in high-harmonic generation from a linear chain

Cited by 11 publications

References 72 publications

Enhanced high-order harmonics through periodicity breaks: from backscattering to impurity states

Enhanced high-order harmonics through periodicity breaks: from backscattering to impurity states

Correlation effects in high-harmonic generation from finite systems

Characterizing Anomalous High-Harmonic Generation in Solids

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