The Coulomb blockade in coupled quantum dots
The Coulomb blockade in coupled quantum dots
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DOI：
10.1126/science.274.5291.1332
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发表时间：
1996-11-22
期刊：
影响因子：
56.9
通讯作者：
Gossard, AC
中科院分区：
文献类型：
--
作者：
Livermore, C;Crouch, CH;Gossard, AC
单个量子点通常被称为“人造原子”。两个隧道耦合的量子点可以被认为是一个人工分子。在砷化镓-砷化镓铝异质结中制备了一系列点间隧道电导可调的双量子点，并对其进行了低温测量。利用库仑阻塞法确定了双量子点上总电荷和静电门引起的点间极化对“分子"内基态电荷组态的影响。当两个点之间的隧道电导从接近零增加到2 e（2）/h（其中e是电子电荷，h是普朗克常数）时，测量的双点电导峰表现出与多体理论一致的显著变化。
Individual quantum dots are often referred to as ''artificial atoms.'' Two tunnel-coupled quantum dots can be considered an ''artificial molecule.'' Low-temperature measurements were made on a series double quantum dot with adjustable interdot tunnel conductance that was fabricated in a gallium arsenide-aluminum gallium arsenide heterostructure, The Coulomb blockade was used to determine the ground-state charge configuration within the ''molecule'' as a function of the total charge on the double dot and the interdot polarization induced by electrostatic gates. As the tunnel conductance between the two dots is increased from near zero to 2e (2)/h (where e is the electron charge and h is Planck's constant), the measured conductance peaks of the double dot exhibit pronounced changes in agreement with many-body theory.