Moriyama S, Fuse T, Suzuki M, Aoyagi Y, Ishibashi K
Advanced Device Laboratory, The Institute of Physical and Chemical Research (RIKEN), 2-1, Hirosawa, Wako, Saitama 351-0198, Japan.
Phys Rev Lett. 2005 May 13;94(18):186806. doi: 10.1103/PhysRevLett.94.186806. Epub 2005 May 11.
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.
在磁场中，对处于弱耦合状态的单壁碳纳米管量子点进行了低温输运测量。观察到了四电子壳层填充情况，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单粒子态的塞曼分裂，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，这是洪德规则最简单的例子。
