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arXiv 2007.02380cond-mat.dis-nn
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非厄米对称随机矩阵在Anderson跃迁附近的谱刚性

Spectral rigidity of non-Hermitian symmetric random matrices near Anderson transition

Yi Huang, B. I. Shklovskii

摘要:

我们研究了Tzortzakakis,Makris和Economou(TME)提出的Anderson模型的非厄米模拟的谱刚性。这是一个$L\times L \times L$紧密结合的立方晶格,其中现场能量的实部和虚部都是均匀分布在$-W/2$和$W/2$之间的独立随机变量。TME模型可用于描述随机激光器。在最近的一篇文章中,我们证明了该模型在三维空间中在$W= W_c \simeq 6$处存在Anderson跃迁。在这里,我们数值对角化TME $L \times L \times L$立方点阵矩阵,并计算其复平面的圆盘中的特征值的数量方差。我们发现,在金属侧$W < 6$的安德森过渡,复杂的本征值相互排斥强烈的复杂Ginibre合奏只在磁盘包含$N_c(L,W)$本征值。我们发现$N_c(L,W)$与$L$成正比,并且随着$W$的减少而增加,类似于Anderson模型的无边界能带中的能级数$N_c$。

英文摘要:

We study the spectral rigidity of the non-Hermitian analog of the Anderson model suggested by Tzortzakakis, Makris and Economou (TME). This is a $L\times L \times L$ tightly bound cubic lattice, where both real and imaginary parts of on-site energies are independent random variables uniformly distributed between $-W/2$ and $W/2$. The TME model may be used to describe a random laser. In a recent paper we proved that this model has the Anderson transition at $W= W_c \simeq 6$ in three dimension. Here we numerically diagonalize TME $L \times L \times L$ cubic lattice matrices and calculate the number variance of eigenvalues in a disk of their complex plane. We show that on the metallic side $W < 6$ of the Anderson transition, complex eigenvalues repel each other as strongly as in the complex Ginibre ensemble only in a disk containing $N_c(L,W)$ eigenvalues. We find that $N_c(L,W)$ is proportional to $L$ and grows with decreasing $W$ similarly to the number of energy levels $N_c$ in the Thouless energy band of the Anderson model.

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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