石墨烯的反常谷磁矩
Anomalous Valley Magnetic Moment of Graphene
摘要：
研究了石墨烯上的载流子相互作用。研究表明，除了众所周知的库仑排斥外，还存在与U过程相关的四个费米子相互作用，其中一个费米子在不同的谷吸引载流子。然后，我们计算的贡献谷磁矩从顶点修正和四费米子修正明确。相对贡献分别为-18%和3%。最后指出可以利用石墨烯中载流子的相互作用来模拟重夸克偶素系统。
英文摘要：
Carrier interactions on graphene are studied. The study shows that besides the well known Coulomb repulsion between carriers, there also exist four-fermion interactions associated with U-process, one of which attracts carriers in different valleys. We then calculate the contributions to valley magnetic moment from vertex correction and from four-fermion corrections explicitly. The relative contributions are -18% and 3% respectively. At last we point out that we can mimic heavy quarkonium system by carrier interactions in graphene.
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