arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0904.4547cond-mat.dis-nn
收藏

Anderson跃迁:作为散射几何函数的透射率的多重分形或非多重分形统计

Anderson transitions : multifractal or non-multifractal statistics of the transmission as a function of the scattering geometry

Cecile Monthus, Thomas Garel

摘要:

安德森局域化的标度理论是基于一个全局电导$g_L$,它在临界时保持为O(1)阶的随机变量。这种电导的一种实现是许多横向通道的Landauer传输。另一方面,两个本地探针之间的单通道Landauer传输的统计描述的多重分形谱,可以与单个本征态的奇异谱。为了更好地理解这两种类型的结果之间的关系,我们考虑各种散射几何形状,这两种情况之间的插值和分析相应的传输的统计。我们提出了详细的数值结果的幂律随机带状矩阵(PRBM模型)。我们的结论是:(i)在存在一个隔离的输入线和多个输出线的情况下,传输具有与输入线到达的站点的局域态密度相同的多重分形统计;(ii)在存在关于情况(i)的后向散射信道的情况下,传输的统计不再是多重分形的,而是变成单分形的。最后,我们还描述了这些散射的几何形状如何影响临界传输的统计。

英文摘要:

The scaling theory of Anderson localization is based on a global conductance $g_L$ that remains a random variable of order O(1) at criticality. One realization of such a conductance is the Landauer transmission for many transverse channels. On the other hand, the statistics of the one-channel Landauer transmission between two local probes is described by a multifractal spectrum that can be related to the singularity spectrum of individual eigenstates. To better understand the relations between these two types of results, we consider various scattering geometries that interpolate between these two cases and analyse the statistics of the corresponding transmissions. We present detailed numerical results for the power-law random banded matrices (PRBM model). Our conclusions are : (i) in the presence of one isolated incoming wire and many outgoing wires, the transmission has the same multifractal statistics as the local density of states of the site where the incoming wire arrives; (ii) in the presence of backward scattering channels with respect to the case (i), the statistics of the transmission is not multifractal anymore, but becomes monofractal. Finally, we also describe how these scattering geometries influence the statistics of the transmission off criticality.

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。

↑