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arXiv 0909.1894cond-mat.dis-nn
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Anderson跃迁时两粒子透射的统计性质

Statistical properties of two-particle transmission at Anderson transition

Cecile Monthus, Thomas Garel

摘要:

$L \times L$幂律随机带状矩阵的系综,其中随机跳跃$H_{i,j}$衰减为幂律$(b/| i-j |)^a$,已知在$a=1$呈现安德森局域化转变,其中单粒子本征函数是多重分形的。在这里,我们研究数值,在这个临界点,统计性质的传输$T_2$两个可区分的粒子,两个玻色子或两个费米子。我们发现$T_2$的统计是多重分形的,即具有$T_2(L) \sim 1/L^κ$的概率表现为$L^{Φ_2(κ)}$,其中费米子的多重分形谱$Φ_2(κ)$不同于普通的可区分粒子和玻色子的多重分形谱.然而,在这三种情况下,典型的透射$T_2^{typ}(L)$由相同的指数$κ_2^{typ}$控制,该指数远小于朴素期望$2κ_1^{typ}$,其中$κ_1^{typ}$是单粒子透射$T_1(L)$的典型指数。

英文摘要:

The ensemble of $L \times L$ power-law random banded matrices, where the random hopping $H_{i,j}$ decays as a power-law $(b/| i-j |)^a$, is known to present an Anderson localization transition at $a=1$, where one-particle eigenfunctions are multifractal. Here we study numerically, at this critical point, the statistical properties of the transmission $T_2$ for two distinguishable particles, two bosons or two fermions. We find that the statistics of $T_2$ is multifractal, i.e. the probability to have $T_2(L) \sim 1/L^κ$ behaves as $L^{Φ_2(κ)}$, where the multifractal spectrum $Φ_2(κ)$ for fermions is different from the common multifractal spectrum concerning distinguishable particles and bosons. However in the three cases, the typical transmission $T_2^{typ}(L)$ is governed by the same exponent $κ_2^{typ}$, which is much smaller than the naive expectation $2κ_1^{typ}$, where $κ_1^{typ}$ is the typical exponent of the one-particle transmission $T_1(L)$.

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