@article{oai:repo.qst.go.jp:00080148,
 author = {Kozak, M. and Martinek, M. and Otobe, Tomohito and Trojanek, F. and Maly, P. and Otobe, Tomohito},
 journal = {Journal of Applied Physics},
 month = {Jul},
 note = {We report on observation of ultrafast impact ionization in monocrystalline diamond driven by high-intensity mid-infrared femtosecond laser pulses. The measurements are based on monitoring the excited carrier population during and after the interaction of the pre-excited sample with a strong infrared pulse by transient transmission spectroscopy and photoluminescence measurements. A two-fold increase of the initial carrier population due to impact ionization is observed with the peak infrared intensity of 2.5 TW/cm2. We observe that the threshold intensity for impact ionization decreases with increasing carrier density. The results are compared with numerical simulations of electron dynamics using time-dependent density functional theory.},
 pages = {015701-1--015701-9},
 title = {Observation of ultrafast impact ionization in diamond driven by mid-infrared femtosecond pulses},
 volume = {128},
 year = {2020}
}