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arXiv 1102.3551cond-mat.mes-hallcond-mat.str-el
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带隙石墨烯的动态电流-电流磁化率

Dynamical current-current susceptibility of gapped graphene

Andreas Scholz, John Schliemann

摘要:

我们给出了石墨烯中任意频率、波矢、掺杂和质量项引起的带隙的电流-电流关联函数的解析表达式。在静态极限下,我们分析了朗道(轨道)和泡利磁化,以及Lindhard校正,其中描述弗里德尔和RKKY振荡。在非相对论极限下,我们比较了我们的结果与通常的二维电子气(2DEG)的情况。我们发现,轨道磁化率(OMS)在带隙的石墨烯是模糊的能量标度给出的倒数质量。等离子体激元色散和Lindhard函数的非相对论极限再现了2DEG的结果。同样的结论也适用于泡利部分的磁化率。带隙石墨烯的特殊能带结构导致赝自旋顺磁性,从而导致特殊形式的OMS。

英文摘要:

We present analytical expressions for the current-current correlation function in graphene for arbitrary frequency, wave vector, doping, and band gap induced by a mass term. In the static limit we analyze the Landau (orbital) and Pauli magnetization, as well as the Lindhard correction which describes Friedel and RKKY oscillations. In the nonrelativistic limit we compare our results with the situation of the usual two-dimensional electron gas (2DEG). We find that the orbital magnetic susceptibility (OMS) in gapped graphene is smeared out on an energy scale given by the inverse mass. The nonrelativistic limit of the plasmon dispersion and the Lindhard function reproduces the results of the 2DEG. The same conclusion is true for the Pauli part of the susceptibility. The peculiar band structure of gapped graphene leads to pseudospin paramagnetism and thus to a special form of the OMS.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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