Abstract
The ionization of excitons by an intense terahertz (THz) laser, in nature, results from the dynamic quantum interference between the discrete state and the THz–photon sidebands of the continuum. As the acceleration of quasimomentum states hinders the simultaneous conservation of the momentum and energy, an intense THz field can block the momentum transfer in the ionization process, and thus suppress the ionization (dephasing) rate. Considering the fact that momentum transfer is essential in various scattering processes, an intense THz field is expected to control and even suppress other dephasing channels. This idea is demonstrated by a seminal example, i.e., the dephasing due to the conventional Fano resonance associated with the subband structures in low-dimensional semiconductors.
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