2013/01/15 by M. Melé-Messeguer, Marina Melé-Messeguer, Bruno Juliá-Díaz +4
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Quantum, superfluid, helium dynamics #Strong Light-Matter Interactions #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.87.033632
published as Phys. Rev. A 87, 033632 (2013) · 6 pages, 4 figures
arxiv created 2013/01/15 · openalex publication_date 2013/03/29 · arxiv updated 2013/04/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the thermal activation of spin fluctuations in dynamically stable spinor Bose-Einstein condensates. We analyze the specific cases of a nondipolar spin-1 condensate in the state m=0, where thermal activation results from spin-changing collisions, and of a chromium condensate in the maximally stretched state m=\ensuremath-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 Bose-Einstein condensates with the usual thermometric techniques. Moreover, the peculiar dependence of the system's entropy with the applied Zeeman energy opens a possible route for adiabatic cooling.