Title: A Low-power Reversible Alkali Atom Source,
Abstract: An electrically-controllable, solid-state, reversible device for sourcing and
sinking alkali vapor is presented. When placed inside an alkali vapor cell,
both an increase and decrease of the rubidium vapor density by a factor of two
are demonstrated through laser absorption spectroscopy on 10 to 15 s time
scales. The device requires low voltage (5 V), low power (<3.4 mW peak power),
and low energy (<10.7 mJ per 10 s pulse). The absence of oxygen emission during
operation is shown through residual gas analysis, indicating Rb is not lost
through chemical reaction but rather by ion transport through the designed
channel. This device is of interest for atomic physics experiments and, in
particular, for portable cold-atom systems where dynamic control of alkali
vapor density can enable advances in science and technology.