Antiferromagnetism and superfluidity of a dipolar Fermi gas in a two-dimensional optical lattice
Antiferromagnetism and superfluidity of a dipolar Fermi gas in a two-dimensional optical lattice
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二维光学晶格中偶极费米气体的反铁磁性和超流性
DOI：
10.1103/physreva.84.043630
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发表时间：
2011-06
影响因子：
2.9
通讯作者：
Yin, Lan
中科院分区：
文献类型：
--
作者：
Liu, Bo;Yin, Lan
在偶极费米气体中，费米子之间的偶极-偶极相互作用可以在交流电场存在下转化为赝自旋之间的偶极伊辛相互作用。当被困在二维光学晶格中时，由于反铁磁性和超流动性之间的竞争，这种偶极费米气体在零温度下具有非常丰富的相图。在半填充时，反铁磁态是有利的基态。在较小的填充系数下，超流体状态表现为基态。在两者之间有一个相分离的区域。根据填充因子和相互作用强度的不同，超流态序参量可以表现出不同的对称性，包括d波(d)、扩展s波（xs）或它们的线性组合（xs+id）。讨论了对当前实验的启示。
In a dipolar Fermi gas, the dipole-dipole interaction between fermions can be turned into a dipolar Ising interaction between pseudospins in the presence of an ac electric field. When trapped in a two-dimensional optical lattice, this dipolar Fermi gas has a very rich phase diagram at zero temperature, due to the competition between antiferromagnetism and superfluidity. At half-filling, the antiferromagnetic state is the favored ground state. The superfluid state appears as the ground state at a smaller filling factor. In between there is a phase-separated region. The order parameter of the superfluid state can display different symmetries depending on the filling factor and interaction strength, including the d-wave (d), the extended s-wave (xs), or their linear combination (xs+id). Implications for the current experiment are discussed.