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发布者： admin 发布时间：2010-03-30
Science 26 March 2010:
Vol. 327. no. 5973, pp. 1621 - 1624
DOI: 10.1126/science.1184565
Anomalous Expansion of Attractively Interacting Fermionic Atoms in an Optical Lattice
The interplay of thermodynamics and quantum correlations can give rise to counterintuitive phenomena in many-body systems. We report on an isentropic effect in a spin mixture of attractively interacting fermionic atoms in an optical lattice. As we adiabatically increase the attraction between the atoms, we observe that the gas expands instead of contracting. This unexpected behavior demonstrates the crucial role of the lattice potential in the thermodynamics of the fermionic Hubbard model.
1 Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany.
2 Ludwig-Maximilians-Universität, 80799 München, Germany.
3 Department of Physics, Harvard University, Cambridge, MA 02138, USA.
4 Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
5 Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
* To whom correspondence should be addressed. E-mail: paredes@uni-mainz.de
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