Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Phys Rev Lett. 2010 Jun 11;104(23):236802. doi: 10.1103/PhysRevLett.104.236802. Epub 2010 Jun 8.
The influence of gate-controlled two-electron exchange on the relaxation of nuclear polarization in small ensembles (N∼10(6)) of nuclear spins is examined in a GaAs double quantum dot system. Waiting in the (2,0) charge configuration, which has large exchange splitting, reduces the nuclear diffusion rate compared to that of the (1,1) configuration. Matching exchange to Zeeman splitting significantly increases the nuclear diffusion rate.
在 GaAs 双量子点系统中，研究了栅控双电子交换对小核自旋集合（N∼10(6)）中核极化弛豫的影响。与（1,1）组态相比，在具有较大交换分裂的（2,0）电荷组态中等待会降低核扩散速率。将交换匹配到塞曼分裂会显著增加核扩散速率。
