Manipulation of mobile spin coherence using magnetic-field-free electron spin resonance
Manipulation of mobile spin coherence using magnetic-field-free electron spin resonance
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DOI：
10.1038/nphys2573
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发表时间：
2013-03
期刊：
影响因子：
19.6
通讯作者：
H. Sanada;Y. Kunihashi;H. Gotoh;K. Onomitsu;M. Kohda;J. Nitta;P. V. Santos;T. Sogawa
中科院分区：
文献类型：
--
作者：
H. Sanada;Y. Kunihashi;H. Gotoh;K. Onomitsu;M. Kohda;J. Nitta;P. V. Santos;T. Sogawa
电子自旋共振（ESR）在量子信息处理中操纵单个电子自旋方面有应用。一般来说，ESR需要两个外部磁场：一个静态场（B 0）用于分裂自旋态的能量，另一个振荡场（B1）的频率与分裂能量共振。然而，自旋操纵方法依赖于真实的磁场比单个电子的尺寸宽得多，能量效率低，不适合未来的设备应用。在这里，我们展示了另一种方法，自旋轨道相互作用的磁阻控制的电子诱导有效的B 0和B1领域。当电子自旋沿着沿着的半导体通道在声波上冲浪时，就产生了这些场。由此产生的自旋动力学--移动自旋共振--相当于通常的ESR，但既不需要静态磁场也不需要依赖于时间的真实的磁场来操纵电子自旋相干性。
Electron spin resonance (ESR) has applications in the manipulation of individual electron spins for quantum information processing,,,,,. In general, ESR requires two external magnetic fields: a static field (B0) to split the spin states in energy and an oscillating field (B1) with the frequency resonant to the splitting energy. However, spin manipulation methods relying on real magnetic fields—much broader than the size of individual electrons—are energetically inefficient and unsuitable for future device applications. Here we demonstrate an alternative approach where the spin–orbit interaction of trajectory-controlled electrons induces effective B0and B1fields. These fields are created when electron spins surf on sound waves,,along winding semiconductor channels. The resultant spin dynamics—mobile spin resonance—is equivalent to the usual ESR but requires neither static nor time-dependent real magnetic fields to manipulate electron spin coherence.