期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 17, 页码 6916-6920出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0809862105
关键词
optical lattice emulator; quantum gases; entropy reduction
资金
- National Science Foundation [DMR0705989, PHY05555576]
- Defense Advanced Research Planning Agency under Army Research Office [W911NF-07-1-0464]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0907366] Funding Source: National Science Foundation
At present, there is considerable interest in using atomic fermions in optical lattices to emulate the mathematical models that have been used to study strongly correlated electronic systems. Some of these models, such as the 2-dimensional fermion Hubbard model, are notoriously difficult to solve, and their key properties remain controversial despite decades of studies. It is hoped that the emulation experiments will shed light on some of these long-standing problems. A successful emulation, however, requires reaching temperatures as low as 10(-12) K and beyond, with entropy per particle far lower than what can be achieved today. Achieving such low-entropy states is an essential step and a grand challenge of the whole emulation enterprise. In this article, we point out a method to literally squeeze the entropy out from a Fermi gas into a surrounding Bose-Einstein condensed gas, which acts as a heat reservoir. This method allows one to reduce the entropy per particle of a lattice Fermi gas to a few percent of the lowest value obtainable today.
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