Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany.
Science. 2010 Mar 26;327(5973):1621-4. doi: 10.1126/science.1184565.
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.
热力学和量子相关性的相互作用可以在多体系统中产生违反直觉的现象。我们报告了在光学晶格中吸引相互作用的费米子原子混合物中的等熵效应。当我们绝热地增加原子之间的吸引力时，我们观察到气体膨胀而不是收缩。这种出乎意料的行为表明晶格势在费米子 Hubbard 模型的热力学中起着至关重要的作用。
