Quantitative estimation of exchange interaction energy using two-electron vertical double quantum dots.
Quantitative estimation of exchange interaction energy using two-electron vertical double quantum dots.
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DOI：
10.1103/physrevlett.102.146802
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发表时间：
2009-04
影响因子：
8.6
通讯作者：
T. Kodera;K. Ono;Y. Kitamura;Y. Tokura;Y. Arakawa;S. Tarucha
中科院分区：
文献类型：
--
作者：
T. Kodera;K. Ono;Y. Kitamura;Y. Tokura;Y. Arakawa;S. Tarucha
利用两电子垂直双量子点中的Pauli自旋阻塞，定量地估算了在较大的点间能级失谐量Delta范围内的交换能J，并与理论计算进行了比较. Pauli自旋阻塞通过由超精细耦合介导的单重态-（S-）三重态（T）跃迁被解除，当S-T跃迁能量或J被塞曼能量补偿时，这在我们的器件中突然发生。我们使用这个特征来导出取决于S-S和T-T共振之间的Delta的J。所得到的J与Delta，包括共振效应是完美的再现哈伯德模型计算。
We use Pauli-spin blockade in two-electron vertical double quantum dots to quantitatively estimate the exchange energy J in a wide range of interdot level detuning Delta and fully compare it with calculations. Pauli-spin blockade is lifted via a singlet- (S-)triplet (T) transition mediated by hyperfine coupling, which abruptly occurs in our devices when the S-T transition energy or J is compensated by the Zeeman energy. We use this feature to derive J depending on Delta between the S-S and T-T resonances. The obtained J versus Delta including the resonance effect is perfectly reproduced by Hubbard model calculations.