Statistics of Coulomb Blockade Peak Spacings
Statistics of Coulomb Blockade Peak Spacings
复制标题
库仑封锁峰间距统计
DOI：
10.1103/physrevlett.80.4522
复制
发表时间：
1997
影响因子：
8.6
通讯作者：
A. Gossard
中科院分区：
文献类型：
--
作者：
S. Patel;S. M. Cronenwett;Duncan R. Stewart;A. Huibers;Charles Marcus;C. I. Duruöz;James S. Harris;K. Campman;A. Gossard
本文报道了GaAs量子点中未破缺（磁场$B\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}}0$）和破缺（磁场$B\ensuremath{\ne}0$）时间反转对称性的大集合的库仑阻断峰间距分布。这两个分布都是对称的，大致为高斯分布，宽度为平均间距的2%，尾部为宽的非高斯分布。在$B\phantom{\rule{0ex}{0ex} = $ phantom{\rule{0ex}{0ex}}0$时，分布系统地更宽，其倍数为$\ensuremath{\sim}1.2\ifmmode\pm\else\textpm\fi{}0.1$。在空间分布中没有发现奇偶间距相关或双峰结构，表明不存在自旋简并。峰间距和峰高之间没有观察到相关关系。
Distributions of Coulomb blockade peak spacings are reported for large ensembles of both unbroken (magnetic field $B\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$) and broken ( $B\ensuremath{\ne}0$) time-reversal symmetry in GaAs quantum dots. Both distributions are symmetric and roughly Gaussian with a width of $\ensuremath{\sim}2%\char21{}6%$ of the average spacing, with broad, non-Gaussian tails. The distribution is systematically wider at $B\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ by a factor of $\ensuremath{\sim}1.2\ifmmode\pm\else\textpm\fi{}0.1$. No even-odd spacing correlations or bimodal structure in the spacing distribution is found, suggesting an absence of spin degeneracy. There is no observed correlation between peak spacing and peak height.