金刚石纳米颗粒中氮空位色心的电子自旋研究  

Electron spin studies of nitrogen vacancy centers in nanodiamonds

作　　者：刘东奇[1] 常彦春[1] 刘刚钦[1] 潘新宇[1] 

机构地区：[1]中国科学院物理研究所,北京100190

出　　处：《物理学报》2013年第16期189-193,共5页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2009CB929103);国家自然科学基金(批准号:10974251)资助的课题~~

摘　　要：通过电子注入的方法制备了含氮空位色心单光子源的金刚石荧光纳米颗粒.自旋回声测试结果表明,纳米颗粒中氮空位色心的相干时间T2很短,介于0.86μs至5.6μs之间.Ramsey干涉条纹测试结果表明,氮空位色心NV1点的退相干时间T2最大,为0.7μs,其电子自旋共振谱可分辨的最小线宽为1.05MHz.并且NV1点的电子自旋共振谱可分辨氮空位色心本身的14N核自旋与氮空位色心电子自旋之间的2.2MHz超精细相互作用,这对于在金刚石纳米颗粒中实现核自旋的操控和多个量子比特的门操作具有重要意义.Fluorescent nanodiamonds containing nitrogen vacancy centers are created by electron irradiation. The values of spin echo coherence time T2 of nitrogen vacancy centers in nanodiamonds are very small, which are between 0.86 bts and 5.6 μs. The results of Ramsey interference fringes show that the values of dephasing time T2＊ differ from each other and the T2＊ of nitrogen vacancy center NV1 is biggest （0.7 μs）. Its inhomogeneous linewidth obtained from Fourier transform frequency spectrum of Ramsey interference fringes is 1.05 MHz. The hyperfine structure for the nitrogen vacancy center electron spin coupled to the host nitrogen-14 nuclear spin can be detected by the electron spin resonance spectrum in nitrogen vacancy center NV1. It is important for the realization of the manipulation of nuclear spins and quantum gates of multiqubit in nanodiamonds.

关 键 词：纳米颗粒 氮空位色心 电子自旋 

分 类 号：O572.322[理学—粒子物理与原子核物理] TB383.1[理学—物理]