2014: Field-cycle-resolved photoionization in solids

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Physicists from the Dept. of Physics, Lomonosov Moscow State University together with the Russian Quantum Center have extended the Keldysh theory of photoionzation of semiconductors to the case of ultrashort driver pulses of arbitrary waveform and pulse width.

The Keldysh theory of photoionization in a solid dielectric is generalized to the case of arbitrarily short driving pulses of arbitrary pulse shape. We derive a closed-form solution for the nonadiabatic ionization rate in a transparent solid with a periodic dispersion relation, which reveals ultrafast ionization dynamics within the field cycle and recovers the key results of the Keldysh theory in the appropriate limiting regimes.

The results of this work have been published in the paper: P. A. Zhokhov and A.M. Zheltikov, “Field-Cycle-Resolved Photoionization in Solids,” Phys; Rev. Lett. 113, 133903 (2014).