Harnessing nuclear spin polarization fluctuations in a semiconductor nanowire
Harnessing nuclear spin polarization fluctuations in a semiconductor nanowire
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DOI：
10.1038/nphys2731
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发表时间：
2013-07
期刊：
影响因子：
19.6
通讯作者：
P. Peddibhotla;F. Xue;Hit Ikaros Hauge;Simone Assali;E. Bakkers;E. Bakkers;M. Poggio
中科院分区：
文献类型：
--
作者：
P. Peddibhotla;F. Xue;Hit Ikaros Hauge;Simone Assali;E. Bakkers;E. Bakkers;M. Poggio
在第一次对凝聚态系统的核磁共振进行测量后不久，布洛赫预测了N个自旋集合的极化成比例的统计波动的存在。这种自旋噪声最近成为纳米级磁共振成像的关键成分。这种突出是目前磁共振成像分辨率达到小于（100纳米）3的结果，在这个尺寸尺度上，统计自旋波动开始主导极化动力学。在这里，我们展示了一种技术，通过利用这些波动产生比热分布更大和更窄的极化，在纳米尺度的核自旋集合中创造自旋秩序。该方法可为增强纳米尺度核自旋产生的弱磁信号或初始化固态中电子自旋量子比特的核超精细场提供途径。
Soon after the first measurements of nuclear magnetic resonance in a condensed-matter system, Bloch predicted the presence of statistical fluctuations proportional to in the polarization of an ensemble of N spins. Such spin noise has recently emerged as a critical ingredient for nanometre-scale magnetic resonance imaging,,,. This prominence is a consequence of present magnetic resonance imaging resolutions having reached less than (100 nm) 3, a size scale at which statistical spin fluctuations begin to dominate the polarization dynamics. Here, we demonstrate a technique that creates spin order in nanometre-scale ensembles of nuclear spins by harnessing these fluctuations to produce polarizations both larger and narrower than the thermal distribution. This method may provide a route to enhancing the weak magnetic signals produced by nanometre-scale volumes of nuclear spins or a way of initializing the nuclear hyperfine field of electron-spin qubits in the solid state.