Effects of disorder on atomic density waves and spin-singlet dimers in one-dimensional optical lattices
Effects of disorder on atomic density waves and spin-singlet dimers in one-dimensional optical lattices
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无序对一维光学晶格中原子密度波和自旋单线二聚体的影响
DOI：
10.1103/physrevb.78.085108
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发表时间：
2008-03
期刊：
影响因子：
--
通讯作者：
高先龙
中科院分区：
文献类型：
--
作者：
高先龙
利用Bethe-ansatz密度泛函理论，研究了均匀分布无序下受限吸引相互作用费米子的一维Hubbard模型。在密度泛函理论中，充分考虑了吸引一维哈伯德模型的强相关的Luther-Emery性质作为参考系。研究了无序性对弱-中吸引相互作用下原子密度波的影响，以及对强吸引区双占位自旋单线态二聚体的影响。发现原子密度波对无序很敏感，双占位的自旋单线态二聚体对无序很不稳定。我们还表明，一个非常弱的无序可以涂抹刚度中的奇点，从而抑制自旋单线态对。
Using the Bethe-ansatz density-functional theory, we study a one-dimensional Hubbard model of confined attractively interacting fermions in the presence of a uniformly distributed disorder. The strongly correlated Luther-Emery nature of the attractive one-dimensional Hubbard model is fully taken into account as the reference system in the density-functional theory. The effects of the disorder are investigated on the atomic density waves in the weak-to-intermediate attractive interaction and on the spin-singlet dimers of doubly occupied sites in the strongly attractive regime. It is found that atomic density waves are sensitive to the disorder and the spin-singlet dimers of doubly occupied sites are quite unstable against the disorder. We also show that a very weak disorder could smear the singularities in the stiffness, thus, suppresses the spin-singlet pairs.