Four-electron shell structures and an interacting two-electron system in carbon-nanotube quantum dots.
Four-electron shell structures and an interacting two-electron system in carbon-nanotube quantum dots.
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DOI：
10.1103/physrevlett.94.186806
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发表时间：
2004-11
影响因子：
8.6
通讯作者：
S. Moriyama;T. Fuse;M. Suzuki;Y. Aoyagi;K. Ishibashi
中科院分区：
文献类型：
--
作者：
S. Moriyama;T. Fuse;M. Suzuki;Y. Aoyagi;K. Ishibashi
已经在磁场弱耦合状态下对单壁碳纳米管量子点进行了低温输运测量。观察了四电子壳填充，并研究了每个库仑峰的磁场演化。激发光谱测量揭示了壳层中一个电子的单粒子态塞曼分裂，并通过直接观察壳层中两个电子在零磁场下的交换分裂证明了单重态和三重态，这是洪德规则的最简单的例子。
Low-temperature transport measurements have been carried out on single-wall carbon-nanotube quantum dots in a weakly coupled regime in magnetic fields. Four-electron shell filling was observed, and the magnetic field evolution of each Coulomb peak was investigated. Excitation spectroscopy measurements have revealed Zeeman splitting of single particle states for one electron in the shell, and demonstrated singlet and triplet states with direct observation of the exchange splitting at zero-magnetic field for two electrons in the shell, the simplest example of Hund's rule.