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arXiv 1002.0523cond-mat.mes-hallcond-mat.mtrl-sci
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单量子点中的光调谐核磁共振

Optically tunable nuclear magnetic resonance in a single quantum dot

M. N. Makhonin, E. A. Chekhovich, P. Senellart, A. Lemaitre, M. S. Skolnick, A. I. Tartakovskii

摘要:

本文报道了用光学探测核磁共振(ODNMR)方法测量单个GaAs量子点中的小自旋系综。使用ODNMR,我们直接测量的非均匀骑士场从光激发的电子作用于原子核的点。由此产生的NMR峰的位移可以通过改变电子占有率和其自旋取向进行光学控制,并导致在高光激发下强烈不对称的线形。NMR线型的全光学控制将能够对点中的小群核自旋进行位置选择性控制。我们的计算还表明,非对称NMR峰线形可以提供信息的电子波函数的体积,并可用于测量纳米结构中的原子的非均匀分布。

英文摘要:

We report optically detected nuclear magnetic resonance (ODNMR) measurements on small ensembles of nuclear spins in single GaAs quantum dots. Using ODNMR we make direct measurements of the inhomogeneous Knight field from a photo-excited electron which acts on the nuclei in the dot. The resulting shifts of the NMR peak can be optically controlled by varying the electron occupancy and its spin orientation, and lead to strongly asymmetric lineshapes at high optical excitation. The all-optical control of the NMR lineshape will enable position-selective control of small groups of nuclear spins in a dot. Our calculations also show that the asymmetric NMR peak lineshapes can provide information on the volume of the electron wave-function, and may be used for measurements of non-uniform distributions of atoms in nano-structures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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