Lozovik Yurii E, Sokolik Alexey A
Institute for Spectroscopy, Russian Academy of Sciences, Fizicheskaya 5, 142190, Troitsk, Moscow Region, Russia.
Nanoscale Res Lett. 2012 Feb 16;7(1):134. doi: 10.1186/1556-276X-7-134.
Massless Dirac electrons in graphene fill Landau levels with energies scaled as square roots of their numbers. Coulomb interaction between electrons leads to mixing of different Landau levels. The relative strength of this interaction depends only on dielectric susceptibility of surrounding medium and can be large in suspended graphene. We consider influence of Landau level mixing on the properties of magnetoexcitons and magnetoplasmons-elementary electron-hole excitations in graphene in quantizing magnetic field. We show that, at small enough background dielectric screening, the mixing leads to very essential change of magnetoexciton and magnetoplasmon dispersion laws in comparison with the lowest Landau level approximation.PACS: 73.22.Pr; 71.35.Ji; 73.43.Mp; 71.70.Gm.
石墨烯中的无质量狄拉克电子填充朗道能级，其能量按能级数量的平方根缩放。电子之间的库仑相互作用导致不同朗道能级的混合。这种相互作用的相对强度仅取决于周围介质的介电常数，并且在悬浮石墨烯中可能很大。我们考虑了朗道能级混合对磁激子和磁等离子体激元（量子化磁场中石墨烯内的基本电子 - 空穴激发）性质的影响。我们表明，在足够小的背景介电屏蔽下，与最低朗道能级近似相比，这种混合导致磁激子和磁等离子体激元色散定律发生非常本质的变化。物理评论快报分类号：73.22.Pr；71.35.Ji；73.43.Mp；71.70.Gm。
