含随机杂质的平坦环面的谱几何
Spectral geometry of flat tori with random impurities
摘要:
本文讨论了无序系统本征函数几何的新结果。更准确地说,我们研究环面$R^d/LZ^d$,$d=2,3$,均匀分布狄拉克质量。而在底部的频谱本征函数被称为本地化,我们表明,足够大的本征值存在均匀分布的本征函数的正概率。我们还研究了随机狄拉克质量密度为正时的极限$L\to\infty$,并推导出了$R^d$上泊松分布狄拉克质量本征值的局域化长度的多项式下界。最后,我们讨论了在一定能量阈值以上的随机位移模型中局部化破裂的一些结果。
英文摘要:
We discuss new results on the geometry of eigenfunctions in disor- dered systems. More precisely, we study tori $R^d/LZ^d$, $d=2,3$, with uniformly distributed Dirac masses. Whereas at the bottom of the spectrum eigenfunctions are known to be localized, we show that for sufficiently large eigenvalue there exist uniformly distributed eigenfunctions with positive probability. We also study the limit $L\to\infty$ with a positive density of random Dirac masses, and deduce a lower polynomial bound for the localization length in terms of the eigenvalue for Poisson distributed Dirac masses on $R^d$ . Finally, we discuss some results on the breakdown of localization in random displacement models above a certain energy threshold.
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