Multiparticle composites in density-imbalanced quantum fluids.
Multiparticle composites in density-imbalanced quantum fluids.
复制标题
密度不平衡量子流体中的多粒子复合材料。
DOI：
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发表时间：
2009
影响因子：
8.6
通讯作者：
T. Jolicoeur
中科院分区：
文献类型：
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作者：
E. Burovski;G. Orso;T. Jolicoeur
我们考虑密度不平衡的二元一维量子气体。虽然此类流体通常是双组分卢廷格液体，但我们表明，如果密度比是有理数 p/q，并且组分之间的质量不对称性足够强，则两个本征模之一会产生间隙。带隙相对应于 (p+q)-粒子复合材料的（代数）排序。特别是，对于有吸引力的混合物，这意味着超导相关性被破坏。我们通过具有跳跃不对称性的费米子哈伯德模型的数值模拟来说明我们的预测。
We consider two-component one-dimensional quantum gases with a density imbalance. While generically such fluids are two-component Luttinger liquids, we show that if the ratio of the densities is a rational number, p/q, and mass asymmetry between components is sufficiently strong, one of the two eigenmodes acquires a gap. The gapped phase corresponds to (algebraic) ordering of (p+q)-particle composites. In particular, for attractive mixtures, this implies that the superconducting correlations are destroyed. We illustrate our predictions by numerical simulations of the fermionic Hubbard model with hopping asymmetry.