Transverse phase matching of high-order harmonic generation in single-layer graphene

Boyero-García, Roberto; Zurrón-Cifuentes, Óscar; Plaja, Luis; Hernández-García, Carlos

doi:10.1364/oe.412639

Cited by 9 publications

(6 citation statements)

References 63 publications

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“…HHG driven by structured beams requires the computation of the macroscopic response of the target. Our strategy follows the discrete-dipole approximation method presented in [54], that has been recently also applied to graphene polycrystals [55]. In this method, the graphene target is divided into a set of elemental surfaces of dimensions small enough to assume the local field profile constant, but still enclosing a sufficient number of graphene's lattice cells to allow the approximation of the Brillouin zone as a continuous region.…”

Section: Methodsmentioning

confidence: 99%

“…The dipole acceleration is used to compute the time derivative of the current density, which is proportional to the radiated near-field, and used as a source for the electromagnetic field propagator, in order to find the far-field distribution. Dynamics of the SLG interaction with the driving field is integrated from the Schrödinger equation in the nearest neighbor tight-binding approximation [12,54].…”

Section: Methodsmentioning

confidence: 99%

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Interplay of crystal symmetries and light topology in high harmonic spectroscopy

García-Cabrera

Boyero-García

Zurrón-Cifuentes

et al. 2022

Preprint

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Structured ultrafast laser beams offer unique opportunities to explore the interplay of the angular momentum of light with matter at the femtosecond scale. Linearly polarized vector beams are paradigmatic examples of structured beams whose topology is characterized by a well-defined Poincaré index. It has been demonstrated that the Poincaré index is a topological invariant during high-order harmonic generation from isotropic targets, such as noble gases. As a result, harmonics are produced as extreme-ultraviolet vector beams with the same topology as the driver. In this work we demonstrate that high-order harmonic generation driven by vector beams from anisotropic crystalline targets, such as single-layer graphene, splits the harmonic field into a multibeam structure: a central vector beam that preserves the driver's topology, surrounded by a topological cluster of unitary vortices, where this symmetry is broken. We identify the target's non-linear anisotropic response as the vehicle of coupling the crystal symmetries with the driving field's topology. Our work opens the route towards using the topological analysis of the high-order harmonic field as a novel spectroscopic tool to reveal the role of symmetries in the non-linear response of matter.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Interplay of crystal symmetries and light topology in high harmonic spectroscopy

García-Cabrera

Boyero-García

Zurrón-Cifuentes

et al. 2022

Preprint

Self Cite

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“…To compute HHG from SLG we follow [9]. First, we discretize the target layer into elemental surface elements, small enough to consider the driver's profile along them as constant.…”

Section: Harmonic Near-field Distributionmentioning

confidence: 99%

Multi-beam vortex generation induced by the non-linear optical anisotropy of graphene

et al. 2022

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We analyse the high harmonic emission from single-layer graphene driven by infrared vector beams. We demonstrate that graphene’s anisotropy offers a privileged scenario to explore non-trivial light spin-orbit couplings, which substantially extends the possibilities for the generation of high-harmonic structured beams currently studied in atomic and molecular targets. In our case, graphene’s crystal symmetry introduces a spin-dependent diffraction pattern that, coupled with the fundamental conservation of the driver’s topological phase, leads to the splitting of the harmonic field in a multi-beam structure, composed of spatially diverging vortices. Our work demonstrates that anisotropic targets are extraordinary tools to sculpt complex structured short-wavelength beams.

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“…Particularly, HHG from solid targets has incited significant interest due to their higher density, which engenders a qualitative enhancement in harmonic conversion efficiency, a consequence of the coherent nature of the process [32][33][34][35][36]. Currently, there has been a burgeoning interest in understanding the nonlinear optical response of lower-dimensional materials, such as 2D graphene [37][38][39][40][41][42][43][44][45][46][47], silicene [48], MoS 2 [49], or hBN [50][51][52], and 1D silicon nanotubes [53] or CNTs [54][55][56]. For instance, the generation of up to the 9th harmonic in gapless graphene has been observed using a mid-infrared driving laser [57,58].…”

Section: Introductionmentioning

confidence: 99%

High-Order Harmonic Generation in 1D Single-Wall Carbon Nanotubes

Zurrón-Cifuentes,

Plaja

2024

Carbon Nanotubes - Recent Advances, Perspectives and Applications [Working Title]

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A comprehensive theoretical investigation of the process of high-order harmonic generation induced by intense few-cycle infrared laser pulses in one-dimensional single-wall carbon nanotubes is presented. The resulting emission spectra exhibit a non-perturbative plateau at high intensities. However, unlike more conventional systems such as atoms, molecules, or bulk solids, there is no simple scaling law governing the relationship between the cut-off frequency and the intensity. The interpretation of this distinctive behavior provides insights into the fundamental mechanism underlying high-order harmonic generation in these low-dimensional carbon allotropes. Employing a model for the emission dipole based on the saddle-point approximation, the study demonstrates that the initial step of harmonic emission is closely linked to the singular geometry of the band structure. This mechanism bears remarkable similarity to that observed in graphene but differs from the tunneling ionization/excitation process observed in gas systems and materials with finite band gaps. Notably, the pivotal role played by van Hove singularities in the generation of electron-hole pairs is demonstrated.

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Transverse phase matching of high-order harmonic generation in single-layer graphene

Cited by 9 publications

References 63 publications

Interplay of crystal symmetries and light topology in high harmonic spectroscopy

Interplay of crystal symmetries and light topology in high harmonic spectroscopy

Multi-beam vortex generation induced by the non-linear optical anisotropy of graphene

High-Order Harmonic Generation in 1D Single-Wall Carbon Nanotubes

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