Department of Physics, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway.
Phys Rev Lett. 2009 Oct 2;103(14):146801. doi: 10.1103/PhysRevLett.103.146801. Epub 2009 Sep 29.
We investigate how spins relax in intrinsic graphene. The spin-orbit coupling arises from the band structure and is enhanced by ripples. The orbital motion is influenced by scattering centers and ripple-induced gauge fields. Spin relaxation due to Elliot-Yafet and Dyakonov-Perel mechanisms and gauge fields in combination with spin-orbit coupling are discussed. In intrinsic graphene, the Dyakonov-Perel mechanism and spin flip due to gauge fields dominate and the spin-flip relaxation time is inversely proportional to the elastic scattering time. The spin-relaxation anisotropy depends on an intricate competition between these mechanisms. Experimental consequences are discussed.
我们研究了自旋在本征石墨烯中的弛豫情况。自旋轨道耦合源于能带结构，并通过波纹得到增强。轨道运动受到散射中心和波纹诱导规范场的影响。我们讨论了由于 Elliot-Yafet 和 Dyakonov-Perel 机制以及与自旋轨道耦合相结合的规范场引起的自旋弛豫。在本征石墨烯中，Dyakonov-Perel 机制和由于规范场引起的自旋翻转占主导地位，自旋翻转弛豫时间与弹性散射时间成反比。自旋弛豫各向异性取决于这些机制之间的复杂竞争。讨论了实验结果。
