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We study the role of the inter- and intraband current in the laserinteraction with the bi-chromatic quasi-periodic crystals. The interactiondynamics are simulated by solving the time-dependent Schr\"odinger equation inthe $k$-space, and time evolution of the inter- and intraband current isobtained in a gauge invariant form. We observed that for certain bi-chromaticpotential ratios, the energy band structure of the `valence band' and the`conduction band' facilitate the interband transitions only at the center or atthe edge of the Brillouin zone, which leads to a very interesting populationtransfer mechanism between the bands. The temporal profile of the inter- andintraband current gives a detailed account of the interaction. The higher-orderharmonic generation (HHG) is also studied for these bi-chromatic opticallattices, and the resultant harmonic yield is commented upon.

Role of inter- and intraband current in laser interaction with bi-chromatic quasi-periodic crystals