Single-electron delocalization in hybrid vertical-lateral double quantum dots
Single-electron delocalization in hybrid vertical-lateral double quantum dots
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DOI：
10.1126/science.1111205
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发表时间：
2005-07-08
期刊：
影响因子：
56.9
通讯作者：
Tarucha, S
中科院分区：
文献类型：
--
作者：
Hatano, T;Stopa, M;Tarucha, S
我们使用了一个混合的垂直-横向双点器件，由横向耦合的垂直量子点，测量点间隧道耦合。通过使用“库仑钻石”的非线性传输测量，我们表明，一个固有的不对称性的电容的组件点的影响钻石的斜率，从而允许确定的点，通过电子已经通过。我们使用这种技术来制备离域的单电子态和Heitler-London（HL）双电子态，我们表明，决定HL是否是基态的点间隧道耦合是可调的。这意味着我们的设备可能是有用的实现两个电子的自旋纠缠。
We used a hybrid vertical-lateral double-dot device, consisting of laterally coupled vertical quantum dots, to measure the interdot tunnel coupling. By using nonlinear transport measurements of "Coulomb diamonds," we showed that an inherent asymmetry in the capacitances of the component dots influences the diamond slopes, thereby allowing for the determination of the dot through which the electron has passed. We used this technique to prepare a delocalized one-electron state and Heitler-London (HL) two-electron state, and we showed that the interdot tunnel coupling, which determines whether HL is the ground state, is tunable. This implies that our device may be useful for implementing two-electron spin entanglement.