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arXiv 1407.0680cond-mat.dis-nnquant-ph
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无序两粒子态的相互作用诱导连接性

Interaction-induced connectivity of disordered two-particle states

D. O. Krimer, S. Flach

摘要:

研究了无序一维势场中两粒子在Fock空间中的相互作用诱导的连通性。最近的计算研究表明,最大的本地化长度$ξ_2$的两个相互作用的粒子在一个弱随机紧密结合的链是增加出乎意料的缓慢相对于单粒子本地化长度$ξ_1$,质疑以前的缩放估计。我们表明,这是一个后果的近似恢复的动量守恒的弱本地化的单粒子本征态,和无序引起的相移部分重叠的状态。主要的共振链接出现在共享相同能量和动量的状态之间。我们证实了我们的分析方法的计算研究高达$ξ_1 = 1000$。$ ξ_1 \approx 400$的潜在非平凡缩放机制远远超出了以前所有的数值攻击。

英文摘要:

We study the interaction-induced connectivity in the Fock space of two particles in a disordered one-dimensional potential. Recent computational studies showed that the largest localization length $ξ_2$ of two interacting particles in a weakly random tight binding chain is increasing unexpectedly slow relative to the single particle localization length $ξ_1$, questioning previous scaling estimates. We show this to be a consequence of the approximate restoring of momentum conservation of weakly localized single particle eigenstates, and disorder-induced phase shifts for partially overlapping states. The leading resonant links appear among states which share the same energy and momentum. We substantiate our analytical approach by computational studies for up to $ξ_1 = 1000$. A potential nontrivial scaling regime sets in for $ ξ_1 \approx 400$, way beyond all previous numerical attacks.

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