Effect of mediated interactions on a Hubbard chain in mixed-dimensional fermionic cold atoms

Effect of mediated interactions on a Hubbard chain in mixed-dimensional fermionic cold atoms
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混合维费米子冷原子中哈伯德链介导相互作用的影响

DOI:
10.1103/physrevresearch.2.033054
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发表时间:
2020
影响因子:
4.2
通讯作者:
Tsai, Shan-Wen
Tsai, Shan-Wen
中科院分区:
--
文献类型:
--
作者:
Okamoto, Junichi;Huang, Wen-Min;Irwin, Kyle;Campbell, David K.;Tsai, Shan-Wen

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冷原子实验现在可以实现不同成分在不同空间维度移动的混合。我们研究了一个费米子混合物,其中一个物种被限制沿着嵌入到由另一个费米子物种填充的二维晶格中的一维晶格移动,并且所有的裸露相互作用都是接触相互作用。通过聚焦一维费米子,我们将这个问题映射到链上具有非局域相互作用的费米子模型上。有效相互作用是由二维费米子介导的,既有吸引的,也有延迟的,其形式可以通过改变二维费米子的密度来改变。通过在弱耦合极限中使用泛函重整化群并忽略延迟效应,我们证明了一维费米子可以被控制在不同的密度波或自旋单态或自旋三态超导相中。
Cold atom experiments can now realize mixtures where different components move in different spatial dimensions. We investigate a fermion mixture where one species is constrained to move along a one-dimensional lattice embedded in a two-dimensional lattice populated by another species of fermions, and where all bare interactions are contact interactions. By focusing on the one-dimensional fermions, we map this problem onto a model of fermions with nonlocal interactions on a chain. The effective interaction is mediated by the two-dimensional fermions and is both attractive and retarded, the form of which can be varied by changing the density of the two-dimensional fermions. By using the functional renormalization group in the weak-coupling limit and ignoring the retardation effect, we show that the one-dimensional fermions can be controlled to be in various density-wave, or spin-singlet or spin-triplet superconducting phases.
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