Abstract
In this work, we investigate high-harmonic generation (HHG) spectra in polyacetylene with two relevant bands by numerically solving the time-dependent Schrödinger equation. Using the Su-Schrieffer-Heeger (SSH) model, the problem reduces to a 2 × 2 tight-binding Bloch Hamiltonian. Additionally, coupling to the laser field requires solving the time-dependent Schrödinger equation numerically in reciprocal space. The HHG spectra are obtained by performing a Fourier transform in two consecutive steps: first on the lattice momentum and then on time. The k -integration of velocity is carried out to ensure the coherent addition of the momentum contributions of all electrons within the Brillouin zone. The time integration of the acceleration yields the HHG spectra. Our findings reveal the well-known signatures of high harmonics from solids.
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