Entropy Exchange in a Mixture of Ultracold Atoms

Year: 2009

Authors: Catani J., Barontini G., Lamporesi G., Rabatti F., Thalhammer G., Minardi F., Stringari S., Inguscio M.

Autors Affiliation: LENS—European Laboratory for Non-Linear Spectroscopy and Dipartimento di Fisica, Universita di Firenze, via N. Carrara 1, I-50019 Sesto Fiorentino—Firenze, Italy;
CNR-INFM, via G. Sansone 1, I-50019 Sesto Fiorentino—Firenze, Italy;
Dipartimento di Fisica, Universita di Trento and CNR-INFM BEC Center, I-38050 Povo, Trento, Italy

Abstract: We investigate experimentally the entropy transfer between two distinguishable atomic quantum gases at ultralow temperatures. Exploiting a species-selective trapping potential, we are able to control the entropy of one target gas in presence of a second auxiliary gas. With this method, we drive the target gas into the degenerate regime in conditions of controlled temperature by transferring entropy to the auxiliary gas. We envision that our method could be useful both to achieve the low entropies required to realize new quantum phases and to measure the temperature of atoms in deep optical lattices. We verified the thermalization of the two species in a 1D lattice.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 103 (14)      Pages from: 140401  to: 140401

More Information: This work was supported by MIUR PRIN 2007, Ente CdR in Firenze, CNR under project EuroQUAM DQS, and EU under STREP CHIMONO and NAME-QUAM.
KeyWords: 1D lattices; Controlled temperature; Entropy transfer; Low entropy; Optical lattices; Quantum gas; Quantum phasis; Target gas; Thermalization; Trapping potential; Ultra low temperatures; Ultracold atoms, Atoms; Entropy, Gases
DOI: 10.1103/PhysRevLett.103.140401

Citations: 126
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