Cooling fermionic atoms in optical lattices by shaping the confinement
Cooling fermionic atoms in optical lattices by shaping the confinement
复制标题
DOI：
10.1103/physreva.79.061601
复制
发表时间：
2009-06-01
影响因子：
2.9
通讯作者：
Koehl, Michael
中科院分区：
文献类型：
--
作者：
Bernier, Jean-Sebastien;Kollath, Corinna;Koehl, Michael
我们提出了一个实验程序来冷却费米子原子加载到光学晶格中。其核心思想是通过形成限制势曲线，在空间上将系统划分为熵富和熵穷区域。在每个粒子的高熵区域的原子随后从系统中分离出来。我们讨论了如何在实验中实现这一建议，并对其效率进行了定量研究。我们发现，每个粒子的熵s通常可以减少10倍，从而可以达到低于s/k(B)的近似0.2的熵。因此，冷却成极受欢迎的量子相（如反铁磁体）是可以实现的。我们表明，该程序对实验条件的变化具有鲁棒性。
We propose an experimental procedure to cool fermionic atoms loaded into an optical lattice. The central idea is to spatially divide the system into entropy-rich and -poor regions by shaping the confining potential profile. Atoms in regions of high entropy per particle are subsequently isolated from the system. We discuss how to experimentally carry out this proposal and perform a quantitative study of its efficiency. We find that the entropy per particle, s, can typically be reduced by a factor of 10 such that entropies lower than s/k(B)similar to 0.2 can be reached. Cooling into highly sought-after quantum phases (such as an antiferromagnet) can thus be achieved. We show that this procedure is robust against variations of the experimental conditions.