https://doi.org/10.1140/epjd/e2019-100252-5
Regular article
A study of metastable ion Coulomb crystals in a polychromatic all-optical trap
Decay process analysis by using supercomputer simulations
Institute of Computational Modeling of the Siberian Branch of the Russian Academy of Sciences 660036 Krasnoyarsk, Russia
a e-mail: krasn@icm.krasn.ru
Received:
22
May
2019
Received in final form:
27
August
2019
Published online:
29
October
2019
Metastable ion Coulomb crystal (ICC) in the polychromatic optical superlattice (OSL) created by so-called rectified gradient forces is studied. Our analysis is based on the numerical solution of the nonlinear stochastic differential equations taking into account the trapping and dissipative forces, their quantum fluctuations, and Coulomb repulsion of ions. The key question is how long will this metastable highly ordered crystalline structure persist. The critical parameter determining the ICC destruction times td is the OSL period L (at fixed intensity values of the optical fields). Our simulations demonstrate that td of the ICC, consisting of several tens of mercury ions, experiences giant changes (by four orders of magnitude) at relatively slight variations of the optical superlattice period L in the range from 0.35 to 0.70 mm. We have shown that the dependence td (L) can be approximated by the Arrhenius-like equation with an effective activation energy which is nonlinearly dependent on the OSL period L. These results explain the ultrahigh sensitivity td (L) to the OSL period L and show how to adjust L to ensure all-optical confinement of ICC in the OSL from a fraction of a second to one and half minutes.
Key words: Cold Matter and Quantum Gas
© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2019