Lundeberg M B, Yang R, Renard J, Folk J A
Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T1Z4.
Phys Rev Lett. 2013 Apr 12;110(15):156601. doi: 10.1103/PhysRevLett.110.156601. Epub 2013 Apr 11.
A principal motivation to develop graphene for future devices has been its promise for quantum spintronics. Hyperfine and spin-orbit interactions are expected to be negligible in single-layer graphene. Spin transport experiments, on the other hand, show that graphene's spin relaxation is orders of magnitude faster than predicted. We present a quantum interference measurement that disentangles sources of magnetic and nonmagnetic decoherence in graphene. Magnetic defects are shown to be the primary cause of spin relaxation, masking any potential effects of spin-orbit interaction.
开发用于未来器件的石墨烯的一个主要动机是其在量子自旋电子学方面的前景。在单层石墨烯中，超精细相互作用和自旋轨道相互作用预计可忽略不计。另一方面，自旋输运实验表明，石墨烯的自旋弛豫比预期快几个数量级。我们提出了一种量子干涉测量方法，该方法可区分石墨烯中磁性和非磁性退相干的来源。结果表明，磁性缺陷是自旋弛豫的主要原因，掩盖了自旋轨道相互作用的任何潜在影响。
