Livermore C, Crouch CH, Westervelt RM, Campman KL, Gossard AC
C. Livermore, C. H. Crouch, R. M. Westervelt, Division of Applied Sciences and Department of Physics, Harvard University, Cambridge, MA 02138, USA. K. L. Campman and A. C. Gossard, Materials Department, University of California, Santa Barbara, CA 93106, USA.
Science. 1996 Nov 22;274(5291):1332-5. doi: 10.1126/science.274.5291.1332.
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 2e2/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.
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被视为一个“人造分子”。在一个由砷化镓 - 铝镓砷异质结构制成的、具有可调节点间隧道电导的串联双量子点上进行了低温测量。利用库仑阻塞来确定“分子”内的基态电荷构型，它是双量子点上总电荷以及由静电门诱导的点间极化的函数。当两个点之间的隧道电导从接近零增加到2e²/h（其中e是电子电荷，h是普朗克常数）时，双量子点的测量电导峰表现出与多体理论一致的明显变化。
