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arXiv 2103.06744cond-mat.dis-nncond-mat.quant-gas
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量子回旋镖效应:超越标准安德森模型

Quantum boomerang effect: beyond the standard Anderson model

L. Tessieri, Z. Akdeniz, N. Cherroret, D. Delande, P. Vignolo

摘要:

最近的研究表明,由于安德森局域化,具有倾斜动量分布的波包在安德森模型中表现出类似于回旋镖的动力学:在初始弹道运动之后,它们进行U形转弯并最终回到它们的起始点。在本文中,我们研究了量子回旋镖效应在各种无序和动力学系统中的鲁棒性:具有伪随机势的紧束缚模型,具有带随机哈密顿量的系统,以及被踢的转子。我们的研究结果表明,回飞棒效应在伪随机势模型中仍然存在。它也存在于反冲转子中,尽管在这种情况下,对初始状态有特定的依赖性。另一方面,我们发现随机跳跃过程抑制了波包的任何漂移运动,从而抑制了回旋镖效应。特别地,如果随机最近邻跳变幅度具有零平均值,则波包保持在其初始位置。

英文摘要:

It was recently shown that wavepackets with skewed momentum distribution exhibit a boomerang-like dynamics in the Anderson model due to Anderson localization: after an initial ballistic motion, they make a U-turn and eventually come back to their starting point. In this paper, we study the robustness of the quantum boomerang effect in various kinds of disordered and dynamical systems: tight-binding models with pseudo-random potentials, systems with band random Hamiltonians, and the kicked rotor. Our results show that the boomerang effect persists in models with pseudo-random potentials. It is also present in the kicked rotor, although in this case with a specific dependency on the initial state. On the other hand, we find that random hopping processes inhibit any drift motion of the wavepacket, and consequently the boomerang effect. In particular, if the random nearest-neighbor hopping amplitudes have zero average, the wavepacket remains in its initial position.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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