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Ultrafast electron cooling in an expanding ultracold plasma.

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 87Rb Bose-Einstein condensate (BEC) by a single femtosecond laser pulse. The large density combined with the 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-1. 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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Kroker T,Großmann M,Sengstock K,Drescher M,Wessels-Staarmann P,Simonet J

doi

10.1038/s41467-020-20815-8

subject

Has Abstract

pub_date

2021-01-26 00:00:00

pages

596

issue

1

issn

2041-1723

pii

10.1038/s41467-020-20815-8

journal_volume

12

pub_type

杂志文章

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