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Increasing Quantum Degeneracy by Heating a Superfluid

  Articoli su Riviste JCR/ISI  (anno 2012)

Autori:  Papoular DJ., Ferrari G., Pitaevskii L.P., Stringari S

Affiliazione Autori:  INO-CNR BEC Center and Dipartimento di Fisica, UniversitÓ di Trento, 38123 Povo, Italy; Kapitza Institute for Physical Problems, Kosygina 2, 119334 Moscow, Russia

Riassunto:  We consider a uniform superfluid confined in two compartments connected by a superleak and initially held at equal temperatures. If one of the two compartments is heated, a fraction of the superfluid will flow through the superleak. We show that, under certain thermodynamic conditions, the atoms flow from the hotter to the colder compartment, contrary to what happens in the fountain effect observed in superfluid helium. This flow causes quantum degeneracy to increase in the colder compartment. In superfluid helium, this novel thermomechanical effect takes place in the phonon regime of very low temperatures. In dilute quantum gases, it occurs at all temperatures below T-c. The increase in quantum degeneracy reachable through the adiabatic displacement of the wall separating the two compartments is also discussed.

Rivista/Giornale:  PHYSICAL REVIEW LETTERS
Volume n.:  109 (8)      Pagine da: 084501  a: 084501
Ulteriori informazioni:  We are grateful to S. Balibar for fruitful discussions. This work has been supported by ERC through the QGBE grant.
DOI: 10.1103/PhysRevLett.109.084501

*Impact Factor della Rivista: (2012) 7.943   *Citazioni: 11
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

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