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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Autores principales:	Tomasz Świsłocki, Mariusz Gajda, Mirosław Brewczyk, Piotr Deuar
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/efe882981e784f9e9dabdc65f869905c
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spelling	oai:doaj.org-article:efe882981e784f9e9dabdc65f869905c2021-12-02T16:31:07ZSpin distillation cooling of ultracold Bose gases10.1038/s41598-021-85298-z2045-2322https://doaj.org/article/efe882981e784f9e9dabdc65f869905c2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85298-zhttps://doaj.org/toc/2045-2322Abstract 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.Tomasz ŚwisłockiMariusz GajdaMirosław BrewczykPiotr DeuarNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tomasz Świsłocki Mariusz Gajda Mirosław Brewczyk Piotr Deuar Spin distillation cooling of ultracold Bose gases
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.
format	article
author	Tomasz Świsłocki Mariusz Gajda Mirosław Brewczyk Piotr Deuar
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 Portfolio
publishDate	2021
url	https://doaj.org/article/efe882981e784f9e9dabdc65f869905c
work_keys_str_mv	AT tomaszswisłocki spindistillationcoolingofultracoldbosegases AT mariuszgajda spindistillationcoolingofultracoldbosegases AT mirosławbrewczyk spindistillationcoolingofultracoldbosegases AT piotrdeuar spindistillationcoolingofultracoldbosegases
_version_	1718383907840196608

Spin distillation cooling of ultracold Bose gases

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