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Anderson Localization of Composite Particles
Physical Review Letters ( IF 8.6 ) Pub Date : 2021-10-12 , DOI: 10.1103/physrevlett.127.160602
Fumika Suzuki 1, 2 , Mikhail Lemeshko 1 , Wojciech H Zurek 3 , Roman V Krems 2, 4
Affiliation  

We investigate the effect of coupling between translational and internal degrees of freedom of composite quantum particles on their localization in a random potential. We show that entanglement between the two degrees of freedom weakens localization due to the upper bound imposed on the inverse participation ratio by purity of a quantum state. We perform numerical calculations for a two-particle system bound by a harmonic force in a 1D disordered lattice and a rigid rotor in a 2D disordered lattice. We illustrate that the coupling has a dramatic effect on localization properties, even with a small number of internal states participating in quantum dynamics.

中文翻译:

复合粒子的安德森定位

我们研究了复合量子粒子的平移自由度和内部自由度之间的耦合对其在随机势中的定位的影响。我们表明,由于量子态纯度对逆参与率施加了上限,因此两个自由度之间的纠缠削弱了局域化。我们对由一维无序晶格中的谐波力和二维无序晶格中的刚性转子约束的双粒子系统进行数值计算。我们说明耦合对局部化特性有显着影响,即使有少量内部状态参与量子动力学。
更新日期:2021-10-12
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