Ultrafast Electron Cooling in an Expanding Ultracold Plasma
arXiv:2005.14009 · doi:10.1038/s41467-020-20815-8
Abstract
Plasma dynamics critically depends on density and temperature, thus well-controlled experimental realizations are essential benchmarks for theoretical models. The formation of an ultracold plasma can be triggered by ionizing a tunable number of atoms in a micrometer-sized volume of a Bose-Einstein condensate (BEC) by a single femtosecond laser pulse. The large density combined with the extremely low temperature of the BEC give rise to an initially strongly coupled plasma in a so far unexplored regime bridging ultracold neutral plasma and ionized nanoclusters. Here, we report on ultrafast cooling of electrons, trapped on orbital trajectories in the long-range Coulomb potential of the dense ionic core, with a cooling rate of 400 K/ps. Furthermore, our experimental setup grants direct access to the electron temperature that relaxes from 5250 K to below 10 K in less than 500 ns.
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Cited by in corpus (5)
- Many-body bound states and induced interactions of charged impurities in a bosonic bath
- Two-dimensional electronic spectroscopy of an ultracold gas
- Cooling dynamics of a free ion in a Bose-Einstein condensate
- Ultrafast many-body dynamics of dense Rydberg gases and ultracold plasma
- Ionization of Rydberg atoms embedded in Ultracold Plasma due to electron-atom interaction