Department of Physics and Astronomy, Georgia State University, 29 Peachtree Center Avenue, # 400, Atlanta, Georgia 30303, USA.
Nat Commun. 2012;3:996. doi: 10.1038/ncomms1986.
Electronic carriers in graphene show a high carrier mobility at room temperature. Thus, this system is widely viewed as a potential future charge-based high-speed electronic material to complement-or replace-silicon. At the same time, the spin properties of graphene have suggested improved capability for spin-based electronics or spintronics and spin-based quantum computing. As a result, the detection, characterization and transport of spin have become topics of interest in graphene. Here we report a microwave photo-excited transport study of monolayer and trilayer graphene that reveals an unexpectedly strong microwave-induced electrical response and dual microwave-induced resonances in the dc resistance. The results suggest the resistive detection of spin resonance, and provide a measurement of the g-factor, the spin relaxation time and the sub-lattice degeneracy splitting at zero magnetic field.
在室温下，石墨烯中的电子载流子表现出很高的载流子迁移率。因此，该体系被广泛认为是一种潜在的未来基于电荷的高速电子材料，可以补充或替代硅。同时，石墨烯的自旋特性表明其在基于自旋的电子学或自旋电子学和基于自旋的量子计算方面具有更好的性能。因此，自旋的检测、表征和输运已经成为石墨烯研究的热点。在这里，我们报告了对单层和三层石墨烯的微波光激发输运研究，该研究揭示了在直流电阻中存在出乎意料的强微波诱导电响应和双微波诱导共振。研究结果表明可以通过电阻检测到自旋共振，并提供了在零磁场下测量 g 因子、自旋弛豫时间和子晶格简并劈裂的方法。
