Luther-Emery phase and atomic-density waves in a trapped fermion gas.
Luther-Emery phase and atomic-density waves in a trapped fermion gas.
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DOI：
10.1103/physrevlett.98.030404
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发表时间：
2006-09
影响因子：
8.6
通讯作者：
Gao Xianlong;M. Rizzi;M. Polini;R. Fazio;M. Tosi;V. L. Campo;K. Capelle
中科院分区：
文献类型：
--
作者：
Gao Xianlong;M. Rizzi;M. Polini;R. Fazio;M. Tosi;V. L. Campo;K. Capelle
Luther-Emery液体是一种物质状态，被预测发生在相互作用的费米子的一维系统中，其特征在于无隙电荷谱和带隙自旋谱。在这封信中，我们讨论了在一个被困冷原子气体的路德-金刚砂相的实现。利用密度矩阵重整化群方法研究了具有吸引相互作用的双组分费米原子气体在光学晶格中的抛物囚禁。我们演示了如何表现出该系统的特点是共存的自旋配对和原子密度波的复合相。随着原子-原子吸引力的增加，发生平滑的交叉，到达紧密结合的自旋单重态二聚体占据陷阱中心的状态。原子密度波的存在可以在光散射衍射图的弹性贡献中检测到。
The Luther-Emery liquid is a state of matter that is predicted to occur in one-dimensional systems of interacting fermions and is characterized by a gapless charge spectrum and a gapped spin spectrum. In this Letter we discuss a realization of the Luther-Emery phase in a trapped cold-atom gas. We study by means of the density-matrix renormalization-group technique a two-component atomic Fermi gas with attractive interactions subject to parabolic trapping inside an optical lattice. We demonstrate how this system exhibits compound phases characterized by the coexistence of spin pairing and atomic-density waves. A smooth crossover occurs with increasing magnitude of the atom-atom attraction to a state in which tightly bound spin-singlet dimers occupy the center of the trap. The existence of atomic-density waves could be detected in the elastic contribution to the light-scattering diffraction pattern.