Carnot Cycles in a Harmonically Confined Ultracold Gas across Bose-Einstein Condensation

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Author(s):	Reyes-Ayala, Ignacio ; Miotti, Marcos ; Hemmerling, Michal ; Dubessy, Romain ; Perrin, Helene ; Romero-Rochin, Victor ; Bagnato, Vanderlei Salvador Total Authors: 7
Document type:	Journal article
Source:	Entropy; v. 25, n. 2, p. 9-pg., 2023-02-01.
Abstract
Carnot cycles of samples of harmonically confined ultracold Rb-87 fluids, near and across Bose-Einstein condensation (BEC), are analyzed. This is achieved through the experimental determination of the corresponding equation of state in terms of the appropriate global thermodynamics for non-uniform confined fluids. We focus our attention on the efficiency of the Carnot engine when the cycle occurs for temperatures either above or below the critical temperature and when BEC is crossed during the cycle. The measurement of the cycle efficiency reveals a perfect agreement with the theoretical prediction (1-T-L/T-H), with T-H and T-L serving as the temperatures of the hot and cold heat exchange reservoirs. Other cycles are also considered for comparison. (AU)

FAPESP's process:	19/21137-0 - Thermodynamic of ultracold gases through global variables, equilibrium and out of equilibrium
Grantee:	Ignacio Reyes Ayala
Support Opportunities:	Scholarships in Brazil - Post-Doctoral


FAPESP's process:	13/07276-1 - CEPOF - Optics and Photonic Research Center
Grantee:	Vanderlei Salvador Bagnato
Support Opportunities:	Research Grants - Research, Innovation and Dissemination Centers - RIDC