arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1101.3155cond-mat.dis-nn
收藏

Anderson无序系统中Wigner延迟时间的统计

The statistics of Wigner delay time in Anderson disordered systems

Fuming Xu, Jian Wang

摘要:

我们数值研究了Anderson无序一维、二维和量子点(QD)系统中Wigner延迟时间的统计特性。每个导电通道的适当延迟时间的分布被发现是普遍的,在2D和QD系统的所有Dyson的对称类,并显示出分段幂律行为在强本地化制度。分别用渐近标度${τ^{-1.5}}$和${τ^{-2}}$确定了两种幂律行为,它们与导电通道的数量和Dyson对称类无关。两个幂律区域由相关时间尺度$τ_0 \sim h/Δ$分隔,其中$Δ$是平均能级间距。研究发现,项链态的存在是导致${τ^{-2}}$的第二次幂律行为的原因,它具有极小的分布概率。

英文摘要:

We numerically investigate the statistical properties of Wigner delay time in Anderson disordered 1D, 2D and quantum dot (QD) systems. The distribution of proper delay time for each conducting channel is found to be universal in 2D and QD systems for all Dyson's symmetry classes and shows a piece-wise power law behavior in the strong localized regime. Two power law behaviors were identified with asymptotical scaling ${τ^{-1.5}}$ and ${τ^{-2}}$, respectively that are independent of the number of conducting channels and Dyson's symmetry class. Two power-law regimes are separated by the relevant time scale $τ_0 \sim h/Δ$ where $Δ$ is the average level spacing. It is found that the existence of necklace states is responsible for the second power-law behavior ${τ^{-2}}$, which has an extremely small distribution probability.

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。

↑