Adiabatic stabilization of excitons in intense terahertz laser

High-precise calculation of near-infrared absorption and transient spectra in bulk semiconductors irradiated by an intense terahertz (THz) laser shows that, the ionization rate of the ground-state exciton, probed through the dynamic Fano resonance, may decrease with the increase of the THz laser intensity. This counterintuitive effect indicates the excitons are stabilized against the field-ionization. The much lower Rydberg energy and atomic unit'' of laser intensity for excitons, and the possibility of creating excitons from the vacuum state’’ allow observing the excitonic stabilization in experiments, in contrast to the case of atomic stabilization.