论文标题
二维随机二聚体电势中的密度波传播：从单个到两部分平方晶格
Density wave propagation in a two-dimensional random dimer potential: from a single to a bipartite square lattice
论文作者
论文摘要
我们研究了限制在晶格上并存在方二色杂质的弱相互作用的玻色子气中密度扰动的传播。这样的二维随机二聚体模型（2D-DRDM）先前在[Capuzzi等人，物理学。 Rev. A 92，053622（2015）]是从单个正方形晶格（缺少杂质的单个晶格）转变为杂质最大数量，与晶格位点的一半重合一半的杂质。我们表明，通过允许密度波动在2D-DRDM晶格中传播，即使在强障碍的极限中，疾病相关性可以在广泛参数的动力学中发挥关键作用。在这样的状态下，传播速度取决于杂质的百分比，在单个单碘晶格中的速度和两分部分中的速度之间进行了插值。
We study the propagation of a density perturbation in a weakly interacting boson gas confined on a lattice and in the presence of square dimerized impurities. Such a two-dimensional random-dimer model (2D-DRDM), previously introduced in [Capuzzi et al., Phys. Rev. A 92, 053622 (2015)], is the disorder transition from a single square lattice, where impurities are absent, to a bipartite square lattice, where the number of impurities is maximum and coincides with half the number of lattice sites. We show that disorder correlations can play a crucial role in the dynamics for a broad range of parameters by allowing density fluctuations to propagate in the 2D-DRDM lattice, even in the limit of strong disorder. In such a regime, the propagation speed depends on the percentage of impurities, interpolating between the speed in a single monoperiodic lattice and that in a bipartite one.
