Document Detail

Negative absolute temperature for motional degrees of freedom.
MedLine Citation:
PMID:  23288533     Owner:  NLM     Status:  In-Data-Review    
Absolute temperature is usually bound to be positive. Under special conditions, however, negative temperatures-in which high-energy states are more occupied than low-energy states-are also possible. Such states have been demonstrated in localized systems with finite, discrete spectra. Here, we prepared a negative temperature state for motional degrees of freedom. By tailoring the Bose-Hubbard Hamiltonian, we created an attractively interacting ensemble of ultracold bosons at negative temperature that is stable against collapse for arbitrary atom numbers. The quasimomentum distribution develops sharp peaks at the upper band edge, revealing thermal equilibrium and bosonic coherence over several lattice sites. Negative temperatures imply negative pressures and open up new parameter regimes for cold atoms, enabling fundamentally new many-body states.
S Braun; J P Ronzheimer; M Schreiber; S S Hodgman; T Rom; I Bloch; U Schneider
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  339     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-04     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  52-5     Citation Subset:  IM    
Fakultät für Physik, Ludwig-Maximilians-Universität München, Munich, Germany.
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Comment In:
Science. 2013 Jan 4;339(6115):42-3   [PMID:  23288530 ]

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