Chiral charge pumping in graphene deposited on a magnetic insulator
Chiral charge pumping in graphene deposited on a magnetic insulator
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DOI：
10.1103/physrevb.95.024408
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发表时间：
2016-09
影响因子：
3.7
通讯作者：
M. Evelt;H. Ochoa;O. Dzyapko;V. Demidov;A. Yurgens;Jie Sun;Y. Tserkovnyak;V. Bessonov;A. Rinkevich;S. Demokritov
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文献类型：
--
作者：
M. Evelt;H. Ochoa;O. Dzyapko;V. Demidov;A. Yurgens;Jie Sun;Y. Tserkovnyak;V. Bessonov;A. Rinkevich;S. Demokritov
实验证明，在石墨烯/钇铁石榴石(YIG)双层膜体系中，可以在室温下实现较大的手性电荷泵浦。这种效应不能归因于普通的自旋泵浦，而是在石墨烯中产生直流电场/电压，作为对相邻平面外磁化的YIG薄膜中动态磁激发(自旋波)的响应。我们发现，当静态磁化方向相反时，感应电压的符号发生变化，清楚地表明石墨烯/YIG界面垂直于平面的镜面反射对称性被破坏。结果表明，效应强度与自旋波频率呈非单调依赖关系，与所提出的理论模型一致。
We demonstrate experimentally that a sizable chiral charge pumping can be achieved at room temperature in graphene/yttrium iron garnet (YIG) bilayer systems. The effect, which cannot be attributed to the ordinary spin pumping, reveals itself in the creation of a dc electric field/voltage in graphene as a response to the dynamic magnetic excitations (spin waves) in an adjacent out-of-plane magnetized YIG film. We show that the induced voltage changes its sign when the orientation of the static magnetization is reversed, clearly indicating the broken mirror reflection symmetry about the planes normal to the graphene/YIG interface. The strength of effect shows a nonmonotonous dependence on the spin-wave frequency, in agreement with the proposed theoretical model.