Spin distillation cooling of ultracold Bose gases
Abstract We study the spin distillation of spinor gases of bosonic atoms and find two different mechanisms in $${}^{52}$$ 52 Cr and $$^{23}$$ 23 Na atoms, both of which can cool effectively. The first mechanism involves dipolar scattering into initially unoccupied spin states and cools only above a...
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2021-03-01
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Series: | Scientific Reports |
Online Access: | https://doi.org/10.1038/s41598-021-85298-z |
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doaj-efe882981e784f9e9dabdc65f869905c2021-03-21T12:38:04ZengNature Publishing GroupScientific Reports2045-23222021-03-0111111410.1038/s41598-021-85298-zSpin distillation cooling of ultracold Bose gasesTomasz Świsłocki0Mariusz Gajda1Mirosław Brewczyk2Piotr Deuar3Institute of Information Technology, Warsaw University of Life Sciences – SGGWInstitute of Physics, Polish Academy of SciencesWydział Fizyki, Uniwersytet w BiałymstokuInstitute of Physics, Polish Academy of SciencesAbstract We study the spin distillation of spinor gases of bosonic atoms and find two different mechanisms in $${}^{52}$$ 52 Cr and $$^{23}$$ 23 Na atoms, both of which can cool effectively. The first mechanism involves dipolar scattering into initially unoccupied spin states and cools only above a threshold magnetic field. The second proceeds via equilibrium relaxation of the thermal cloud into empty spin states, reducing its proportion in the initial component. It cools only below a threshold magnetic field. The technique was initially demonstrated experimentally for a chromium dipolar gas (Naylor et al. in Phys Rev Lett 115:243002, 2015), whereas here we develop the concept further and provide an in-depth understanding of the required physics and limitations involved. Through numerical simulations, we reveal the mechanisms involved and demonstrate that the spin distillation cycle can be repeated several times, each time resulting in a significant additional reduction of the thermal atom fraction. Threshold values of magnetic field and predictions for the achievable temperature are also identified.https://doi.org/10.1038/s41598-021-85298-z |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tomasz Świsłocki Mariusz Gajda Mirosław Brewczyk Piotr Deuar |
spellingShingle |
Tomasz Świsłocki Mariusz Gajda Mirosław Brewczyk Piotr Deuar Spin distillation cooling of ultracold Bose gases Scientific Reports |
author_facet |
Tomasz Świsłocki Mariusz Gajda Mirosław Brewczyk Piotr Deuar |
author_sort |
Tomasz Świsłocki |
title |
Spin distillation cooling of ultracold Bose gases |
title_short |
Spin distillation cooling of ultracold Bose gases |
title_full |
Spin distillation cooling of ultracold Bose gases |
title_fullStr |
Spin distillation cooling of ultracold Bose gases |
title_full_unstemmed |
Spin distillation cooling of ultracold Bose gases |
title_sort |
spin distillation cooling of ultracold bose gases |
publisher |
Nature Publishing Group |
series |
Scientific Reports |
issn |
2045-2322 |
publishDate |
2021-03-01 |
description |
Abstract We study the spin distillation of spinor gases of bosonic atoms and find two different mechanisms in $${}^{52}$$ 52 Cr and $$^{23}$$ 23 Na atoms, both of which can cool effectively. The first mechanism involves dipolar scattering into initially unoccupied spin states and cools only above a threshold magnetic field. The second proceeds via equilibrium relaxation of the thermal cloud into empty spin states, reducing its proportion in the initial component. It cools only below a threshold magnetic field. The technique was initially demonstrated experimentally for a chromium dipolar gas (Naylor et al. in Phys Rev Lett 115:243002, 2015), whereas here we develop the concept further and provide an in-depth understanding of the required physics and limitations involved. Through numerical simulations, we reveal the mechanisms involved and demonstrate that the spin distillation cycle can be repeated several times, each time resulting in a significant additional reduction of the thermal atom fraction. Threshold values of magnetic field and predictions for the achievable temperature are also identified. |
url |
https://doi.org/10.1038/s41598-021-85298-z |
work_keys_str_mv |
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