Charging and Spin Effects in Triple Dot Artificial Molecules
Charging and Spin Effects in Triple Dot Artificial Molecules
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三点人造分子中的电荷和自旋效应
DOI：
10.1007/s10948-005-3373-8
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
A. Gossard
中科院分区：
文献类型：
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作者：
A. Vidan;R. Westervelt;M. Stopa;M. Hanson;A. Gossard
我们利用光刻图型栅极和沟槽制造了由三个耦合量子点组成的人工分子，这些量子点定义在GaAs/AlGaAs异质结构的二维电子气体中。这三个点排列成环形结构，其中每个点与其他两个点耦合。我们发现，当调谐到库仑封锁状态时，三重量子点装置充当电荷整流器：一个电子进入它被捕获的第三个点，产生干扰效应，使其他电子无法进入第一个点。在环形中耦合的三重量子点将允许使用人工分子研究新的分子相，也可以作为量子计算的二维阵列的构建块。
We have fabricated artificial molecules consisting of three coupled quantum dots defined in the two-dimensional electron gas of a GaAs/AlGaAs heterostructure using lithographically patterned gates and trenches. The three dots are arranged in a ring structure, where each dot is coupled to the other two dots. We find that, when tuned to the Coulomb blockade regime, the triple quantum dot device acts as a charge rectifier: an electron enters the third dot where it is trapped, producing a jamming effect where no other electron may enter the first dot. Triple quantum dots coupled in a ring will allow for the study of new molecular phases using artificial molecules and may also serve as building blocks of two-dimensional arrays for quantum computation.