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arXiv 1412.7861cond-mat.dis-nncond-mat.stat-mech
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局部化系统与小浴池耦合:从A $_{nderson}$到Z $_{eno}$

Localized systems coupled to small baths: from A$_{nderson}$ to Z$_{eno}$

D. A. Huse, R. Nandkishore, F. Pietracaprina, V. Ros, A. Scardicchio

摘要:

我们调查会发生什么,如果一个安德森本地化系统耦合到一个小浴,与离散谱,当系统和浴之间的耦合是特别选择,以便永远不会本地化浴。我们发现,在系统中的局域化的浴的效果是一个非单调函数的系统和浴之间的耦合。在弱耦合时,浴通过允许系统从浴中“借用”能量来促进传输。但在一定的耦合以上的浴产生本地化,由于正交性的灾难,由此浴'打扮'的系统,因此抑制跳跃矩阵元素。我们称这最后一种机制为“Zeno局域化”机制,因为这种机制的物理学类似于量子Zeno效应,其中对粒子位置的频繁测量会阻碍其运动。我们证实了我们的结果,数值精确对角化。

英文摘要:

We investigate what happens if an Anderson localized system is coupled to a small bath, with a discrete spectrum, when the coupling between system and bath is specially chosen so as to never localize the bath. We find that the effect of the bath on localization in the system is a non-monotonic function of the coupling between system and bath. At weak couplings, the bath facilitates transport by allowing the system to 'borrow' energy from the bath. But above a certain coupling the bath produces localization, because of an orthogonality catastrophe, whereby the bath 'dresses' the system and hence suppresses the hopping matrix element. We call this last regime the regime of "Zeno-localization", since the physics of this regime is akin to the quantum Zeno effect, where frequent measurements of the position of a particle impede its motion. We confirm our results by numerical exact diagonalization.

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