直接偶极-偶极相互作用引起的核自旋退相干的核磁共振探测
Decoherence of nuclear spins due to direct dipole-dipole interactions probed by resistively detected nuclear magnetic resonance
摘要：
我们使用电阻检测的核磁共振研究了GaAs量子阱结构中核自旋的退相干。本文用Rabi型相干振荡和自旋回波技术计算了~（75）As核的横向退相干时间T_2。通过分析由去耦技术得到的T2，我们提取的偶极-偶极相互作用的GaAs中的退相干源的作用。在器件倾斜放置于外部磁场中的条件下，我们发现第一近邻原子核之间的直接偶极-偶极相互作用强度的变化引起了退相干的增强.计算结果与简单的数值计算结果吻合较好。
英文摘要：
We study decoherence of nuclear spins in a GaAs quantum well structure using resistively detected nuclear magnetic resonance. The transverse decoherence time T2 of 75As nuclei is estimated from Rabi-type coherent oscillations as well as by using spin-echo techniques. By analyzing T2 obtained by decoupling techniques, we extract the role of dipole-dipole interactions as sources of decoherence in GaAs. Under the condition that the device is tilted in an external magnetic field, we exhibit enhanced decoherence induced by the change in strength of the direct dipole-dipole interactions between first nearest-neighbor nuclei. The results agree well with simple numerical calculations.
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