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arXiv 1606.04700cond-mat.dis-nn
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耦合一维多体局域系统中密度波的衰减

Decay of density waves in coupled one-dimensional many-body-localized systems

Peter Prelovšek

摘要:

分析了耦合无序一维系统的行为,该系统由具有在位势无序和通过链间跳跃$t'$出现的耦合的完全相同的费米哈伯德链模拟。本研究的动机是在无序晶格上的费米子冷原子的实验,在那里测量了淬灭密度波的衰减率。我们提出了一个推导的衰变率$Γ$内微扰理论,并表明,即使在大的无序沿链的相互作用导致有限的$Γ> 0$,其机制是相互作用引起的耦合链本地化和链间扩展的单费米子状态。$Γ$的显式表达式为弱相互作用$U < t,t'$,但也扩展到政权$t > U >t'$。结果表明,在这两个制度$Γ$增加与链间跳跃$t'$,以及随着增加的障碍减少。

英文摘要:

The behavior of coupled disordered one-dimensional systems, as modelled by identical fermionic Hubbard chains with the on-site potential disorder and coupling emerging through the inter-chain hopping $t'$, is analysed. The study is motivated by the experiment on fermionic cold atoms on a disordered lattice, where a decay rate of the quenched density wave was measured. We present a derivation of the decay rate $Γ$ within perturbation theory and show that even at large disorder along the chains the interaction leads to finite $Γ> 0$, the mechanism being the interaction-induced coupling of in-chain localized and inter-chain extended single-fermion states. Explicit expressions for $Γ$ are presented for a weak interaction $U < t,t'$, but extended also to the regime $t > U >t'$. It is shown that in both regimes $Γ$ increases with the inter-chain hopping $t'$, as well as decreases with increasing disorder.

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