Ren Wei, Xu Fuming, Wang Jian
Nanotechnology. 2008 Oct 29;19(43):435402. doi: 10.1088/0957-4484/19/43/435402. Epub 2008 Sep 22.
We report an investigation of the dynamic conductance fluctuation of disordered mesoscopic conductors including one-dimensional, two-dimensional, and quantum dot systems. Our numerical results show that in the quasi-ballistic regime the average emittance is negative, indicating the expected inductive-like behavior. However, in the diffusive and localized regime, the average emittance is still negative. This disagrees qualitatively with the result obtained from random matrix theory. Our analysis suggests that this counterintuitive result is due to the appearance of non-diffusive elements in the system, the necklace states (or the precursor of necklace states in the diffusive regime) whose existence has been confirmed experimentally in an optical system.
我们报告了对包括一维、二维和量子点系统在内的无序介观导体动态电导涨落的一项研究。我们的数值结果表明，在准弹道区域，平均发射率为负，这表明了预期的类似电感的行为。然而，在扩散和局域区域，平均发射率仍然为负。这在定性上与随机矩阵理论得到的结果不一致。我们的分析表明，这个违反直觉的结果是由于系统中出现了非扩散元素，即项链态（或扩散区域中项链态的前驱体），其存在已在一个光学系统中通过实验得到证实。
