Spin interactions and switching in vertically tunnel-coupled quantum dots

被引:130
作者
Burkard, G [1 ]
Seelig, G [1 ]
Loss, D [1 ]
机构
[1] Univ Basel, Dept Phys & Astron, CH-4056 Basel, Switzerland
来源
PHYSICAL REVIEW B | 2000年 / 62卷 / 04期
关键词
D O I
10.1103/PhysRevB.62.2581
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We determine the spin-exchange coupling J between two electrons located in two vertically tunnel-coupled quantum dots, and its variation when magnetic (B) and electric (E) fields (both in-plane and perpendicular) are applied. We predict a strong decrease of J as the in-plane B field is increased, mainly due to orbital compression. Combined with the Zeeman splitting, this leads to a singlet-triplet crossing, which can be observed as a pronounced jump in the magnetization at in-plane fields of a few T, and perpendicular fields of the order of 10 T for typical self-assembled dots. We use harmonic potentials to model the confining of electrons, and calculate the exchange J using the Heitler-London and Hund-Mulliken techniques, including the long-range Coulomb interaction With our results we provide experimental criteria for the distinction of singlet and triplet states, and therefore for microscopic spin measurements. In the case where dots of different sizes are coupled, we present a simple method to switch the spin coupling on and off with exponential sensitivity using an in-plane electric field. Switching the spin coupling is essential for quantum computation using electronic spins as qubits.
引用
收藏
页码:2581 / 2592
页数:12
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