Influence of chirp and carrier-envelope phase on noninteger high-harmonic generation

We report a systematic and detailed investigation on strong-field driven non-perturbative high-harmonic generation from Weyl semimetals in various realistic environments, i.e., going beyond the idealistic situation where the Weyl nodes are at Fermi energy and are energy degenerate. Two classes of topological semimetals are considered: time-reversal broken Weyl semimetal and inversion-symmetry broken Weyl semimetal. It has been found that type-II Weyl semimetal leads to significant enhancement in the yield of the higher-order harmonics. In addition, energy splitting between the Weyl nodes also results in a modest boost in the harmonic yield. The underlying mechanism responsible for the enhancement can be traced to a drastic increase in the conduction band electronic population and noticeable changes in the momentum matrix amplitude. A combined effect of the tilt in the Weyl cones and energy separation between the nodes allows the generation of forbidden even-order harmonics in inversion-symmetric Weyl semimetal. Our findings offer exciting avenues for Weyl semimetals in ultrafast photonics and optoelectronic devices.

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Analytically controlling the laser-induced electron phase in sub-cycle motion

Trieu,

Nguyen,

Nguyen

et al. 2024

Phys. Rev. A

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We develop an approach to directly control the phase of an electron's sub-cycle motion in an intense laser field. The method is established by tuning a low-frequency electric field applied on a centrosymmetric gaseous target during its interaction with a few-cycle infrared laser pulse. We find a universal analytical relation between the low-frequency electric field and its induced harmonic frequency shift, derived by the strong-field approximation. This simple relation and its universality are confirmed numerically by directly solving the time-dependent Schrödinger equation. Moreover, we demonstrate the benefits of the discovered relation in applications, including continuously and precisely tuning XUV waves and developing a method of comprehensively sampling the THz pulse. Published by the American Physical Society 2024

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Influence of chirp and carrier-envelope phase on noninteger high-harmonic generation

Cited by 7 publications

References 73 publications

Ultrafast high-harmonic spectroscopy of solids

Ultrafast high-harmonic spectroscopy of solids

Non-perturbative nonlinear optical responses in Weyl semimetals

Analytically controlling the laser-induced electron phase in sub-cycle motion

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