Statistics of conductance oscillations of a quantum dot in the Coulomb-blockade regime
Statistics of conductance oscillations of a quantum dot in the Coulomb-blockade regime
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DOI：
10.1209/epl/i1997-00212-8
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发表时间：
1997-01
期刊：
影响因子：
1.8
通讯作者：
F. Simmel;Thomas Heinzel;D. Wharam
中科院分区：
文献类型：
--
作者：
F. Simmel;Thomas Heinzel;D. Wharam
研究了量子点在库仑阻塞状态下电导峰间距的波动和分布，并与随机矩阵理论的预测结果进行了比较。实验数据是在GaAs-AlGaAs异质结构半导体量子点的输运测量中获得的。在量子点中，峰间距的涨落比平均能级间距大得多。对于零磁场和非零磁场，间距分布似乎都是高斯分布，并且与RMT预测强烈偏离。
The fluctuations and the distribution of the conductance peak spacings of a quantum dot in the Coulomb-blockade regime are studied and compared with the predictions of random matrix theory (RMT). The experimental data were obtained in transport measurements performed on a semiconductor quantum dot fabricated in a GaAs-AlGaAs heterostructure. It is found that the fluctuations in the peak spacings are considerably larger than the mean level spacing in the quantum dot. The distribution of the spacings appears to be Gaussian both for zero and for non-zero magnetic field and deviates strongly from the RMT predictions.