Abstract
On the basis of the complex-scaled Floquet formalism, metastable states in intense laser fields are investigated by tracing the motion of resonance poles on the complex-energy Riemann surface. We analyzed a model system, in which an electron trapped in a one-dimensional potential well is exposed to an intense laser field. The formation of light-induced states (LIS) is found to be ubiquitous for a wide range of laser frequency. The mathematical origin of LIS, however, depends on the laser frequency. When the laser frequency is tuned to or lower than the one-photon ionization threshold, the LIS originates from a shadow pole of the original bound state. In such a case, the LIS's are predicted to be experimentally detectable as intense peaks in photoelectron spectrum.
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