Two-color laser control of photocurrent and high harmonics in graphene

• URL: http://arxiv.org/abs/2410.07767v1
• Date: Thu, 10 Oct 2024 09:54:41 GMT
• Title: Two-color laser control of photocurrent and high harmonics in graphene
• Authors: Minoru Kanega, Masahiro Sato,
• Abstract summary: We investigate two-color laser driven photocurrent and high harmonic generation (HHG) in graphene models. We demonstrate that the HHG spectra can be drastically altered by tuning the spatial symmetry of the laser-field trajectory. We also show that both the magnitude and the direction of photocurrent can be controlled by varying the frequency, intensity, ellipticity, and phase of the two-color laser.
• Score: 2.6887381380521878
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We comprehensively investigate two-color laser driven photocurrent and high harmonic generation (HHG) in graphene models. By numerically solving the quantum master equation, we unifiedly explore a broad parameter regime including both the weak (perturbative) and intense laser (non-perturbative) cases while considering the dissipation effects. We demonstrate that the HHG spectra can be drastically altered by tuning the spatial symmetry of the laser-field trajectory. This controllability is explained by the dynamical symmetry argument. We also show that both the magnitude and the direction of photocurrent (zero-th order harmonics) can be controlled by varying the frequency, intensity, ellipticity, and phase of the two-color laser. Furthermore, the nature of photocurrent is shown to be classified into shift or injection current types, depending on the phase of two-color laser. Our findings indicate that even in centrosymmetric electron systems, photocurrent and HHG can be quantitatively controlled by adjusting various external parameters if we utilize multiple-color laser with a lower spatial or temporal symmetry.

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