Ground state of a mixture of two species of fermionic atoms in a one-dimensional optical lattice
Ground state of a mixture of two species of fermionic atoms in a one-dimensional optical lattice
复制标题
DOI：
10.1103/physrevb.76.125107
复制
发表时间：
2006-01
影响因子：
3.7
通讯作者：
S. Gu;R. Fan;Hai-Qing Lin
中科院分区：
文献类型：
--
作者：
S. Gu;R. Fan;Hai-Qing Lin
本文研究了非对称Hubbard模型描述的一维光学晶格中两种费米子原子混合物的基态性质。通过研究相应的电荷序参数和量子纠缠，研究了从密度波到相分离的量子相变。严格证明了即使在单孔掺杂的情况下，密度波在无限大的U极限内对相分离是不稳定的。因此，我们的结果对正在进行的强关联冷原子系统和传统重费米子系统的实验都很有指导意义。
In this paper, we investigate the ground-state properties of a mixture of two species of fermionic atoms in a one-dimensional optical lattice, as described by the asymmetric Hubbard model. The quantum phase transition from density wave to phase separation is investigated by studying both the corresponding charge order parameter and quantum entanglement. A rigorous proof that even for the single-hole doping case, the density wave is unstable to the phase separation in the infinite $U$ limit, is given. Therefore, our results are quite instructive for both ongoing experiments on strongly correlated cold-atomic systems and traditional heavy fermion systems.