Spin blockade in a double quantum dot containing three electrons
Spin blockade in a double quantum dot containing three electrons
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DOI：
10.1103/physrevb.89.085302
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发表时间：
2014-02
影响因子：
3.7
通讯作者：
S. Amaha;W. Izumida;T. Hatano;S. Tarucha;K. Kono;K. Ono
中科院分区：
文献类型：
--
作者：
S. Amaha;W. Izumida;T. Hatano;S. Tarucha;K. Kono;K. Ono
高自旋态的实现与铁磁性和分子磁性有关，一直是一个很有吸引力的研究课题。在这里，利用非平衡条件，我们实现了高人口的四重态（总自旋= 3/2）在一个双量子点含有三个电子。由于泡利不相容，四重态不能跃迁到电子双占据态。因此，它位于电荷转移循环中的死端路径的末端，并且一旦被访问，三电子状态就堆叠在四重态。由于三电子四重态自旋态中的高布居数，即使在高偏压下也观察到电流抑制，这也可以通过简单的理论模型再现。
The realization of a high spin state, which is related to ferromagnetism and molecular magnetism, has been an attractive research topic. Here, using the nonequilibrium condition, we realize a high population of the quadruplet states (total spin= 3/2) in a double quantum dot containing three electrons. Owing to Pauli exclusion, the quadruplet states are forbidden to transit to states with electron double occupancy. Thus, it is located at the end of the dead-end path in a charge transfer cycle, and the three-electron state is stacked at the quadruplet state once it is accessed. As a result of the high population in the three-electron quadruplet spin states, current suppression is observed even under a high bias, which was also reproduced by a simple theoretical model.