Abstract
Delocalized Bloch electrons in solids are usually regarded as a kind of representative quantum Fermi gas. To unravel the real-space dynamics of Bloch electrons under a tailoring intraband current, we introduced a quasiparticle picture of a wave packet via superposing the multiple Bloch states within a given crystal-momentum region. We find that temporal characteristics and yield modulation in solid-state high-harmonic generation (HHG) depend sensitively on the crystal-momentum region of generating electron-hole pair. Its mechanism could be clarified by the gradual symmetrization of the time-dependent carrier distribution with the growing tunneling-momentum range. Manipulation of tunneling-momentum range is experimentally feasible via photon-carrier doping of appropriate preexcitation pulse. Finally, we elucidate the role of dephasing in the process of HHG. The scheme of customizing intraband current provides an alternative way to regulate the high-harmonic generation of solids.
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