Thermal spin fluctuations in spinor Bose-Einstein condensates

We study the thermal activation of spin fluctuations in dynamically-stable spinor Bose-Einstein condensates. We analyze the specific cases of a non-dipolar spin-1 condensate in m = 0, where thermal activation results from spin-changing collisions, and of a Chromium condensate in the maximally stretc...

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Published in:arXiv.org 2013-01
Main Authors: Melé-Messeguer, Marina, Juliá-Díaz, Bruno, Polls, Artur, Santos, Luis
Format: Article
Language:English
Subjects:
Bose-Einstein condensates
Chromium
Dependence
Dipoles
Matter & antimatter
Variation
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Juliá-Díaz, Bruno
Polls, Artur
Santos, Luis
description We study the thermal activation of spin fluctuations in dynamically-stable spinor Bose-Einstein condensates. We analyze the specific cases of a non-dipolar spin-1 condensate in m = 0, where thermal activation results from spin-changing collisions, and of a Chromium condensate in the maximally stretched state m = -3, where thermal spin fluctuations are due to dipole-induced spin- relaxation. In both cases, we show that the low energy associated to the spinor physics may be employed for thermometry purposes down to extremely low temperatures, typically impossible to measure in BECs with usual thermometric techniques. Moreover, the peculiar dependence of the system's entropy with the applied Zeeman energy opens a possible route for adiabatic cooling.
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subjects Bose-Einstein condensates
Chromium
Dependence
Dipoles
Matter & antimatter
Variation
title Thermal spin fluctuations in spinor Bose-Einstein condensates
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