光晶格费米子的热涨落与量子涨落
Thermal versus Quantum Fluctuations of Optical Lattice Fermions
摘要：
我们证明了，对于一维光晶格中的费米子原子，双占据位置的原子分数是温度的高度非单调函数。我们证明，这种属性仍然存在，即使在现实的谐波约束的存在下，它导致在中间温度下的熵的抑制，提供了一条路线绝热冷却。我们对这种抑制的解释是，这样的中间温度对于量子相干性来说太高，而对于双占据的显著热激发来说太低，从而提供了量子涨落开始的明确指示。
英文摘要：
We show that, for fermionic atoms in a one-dimensional optical lattice, the fraction of atoms in doubly occupied sites is a highly non-monotonic function of temperature. We demonstrate that this property persists even in the presence of realistic harmonic confinement, and that it leads to a suppression of entropy at intermediate temperatures that offers a route to adiabatic cooling. Our interpretation of the suppression is that such intermediate temperatures are simultaneously too high for quantum coherence and too low for significant thermal excitation of double occupancy thus offering a clear indicator of the onset of quantum fluctuations.
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