arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.09247cond-mat.quant-gascond-mat.dis-nnquant-ph
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二维玻色-哈伯德模型的迁移率边

Mobility edge of the two dimensional Bose-Hubbard model

Andreas Geißler, Guido Pupillo

摘要:

利用最近发展起来的涨落算符展开方法计算了二维玻色-哈伯德模型的全低能准粒子谱,分析了无序驱动的局域化.对于任何强度的本地相互作用,我们发现一个流动性的边缘,显示一个近似指数衰减的无序强度增加。我们确定的有限尺寸标度崩溃和指数在此临界线发现的本地化的激发的特点是弱多重分形和热的临界间隙比。最近的实验的直接比较产生一个很好的匹配的预测有限尺寸的转变点和缩放的单粒子相关性。

英文摘要:

We analyze the disorder driven localization of the two dimensional Bose-Hubbard model by evaluating the full low energy quasiparticle spectrum via a recently developed fluctuation operator expansion method. For any strength of the local interaction we find a mobility edge that displays an approximately exponential decay with increasing disorder strength. We determine the finite-size scaling collapse and exponents at this critical line finding that the localization of excitations is characterized by weak multi-fractality and a thermal-like critical gap ratio. A direct comparison to a recent experiment yields an excellent match of the predicted finite-size transition point and scaling of single particle correlations.

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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