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Coulomb interaction and electron-hole asymmetry in cyclotron resonance of bilayer graphene in a high magnetic field

机译：高磁场下双层石墨烯回旋共振中的库仑相互作用和电子-空穴不对称性

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摘要

Inter-Landau-level transitions in the bilayer graphene in high perpendicular magnetic field at the filling factor v = 0 have been studied. The next-nearest-neighbor transitions, energy difference between dimer and nondimer sites, and layer asymmetry are included. The influence of Coulomb interaction is taken into account. The magnetoplasmon excitations in bilayer graphene at small momenta are considered within the Hartree-Fock approximation. The asymmetry in cyclotron resonance of clean bilayer graphene is shown to depend on magnetic field. At lower magnetic fields, the energy splitting in the spectrum is due to electron-hole one-particle asymmetry, while at higher magnetic fields, it is due to Coulomb interaction. For the fully symmetric case with half-filled zero-energy levels, the energy splitting proportional to the energy of Coulomb interaction is found both for bilayer and monolayer graphene.
机译：研究了在高垂直磁场中填充因子v = 0时双层石墨烯中的兰多能级跃迁。包括下一个近邻跃迁，二聚体和非二聚体位点之间的能量差以及层不对称性。考虑了库仑相互作用的影响。在Hartree-Fock近似中考虑了在小时刻的双层石墨烯中的磁等离子体激元激发。干净的双层石墨烯在回旋共振中的不对称性取决于磁场。在较低的磁场下，光谱中的能量分裂是由于电子-空穴单粒子不对称引起的，而在较高的磁场下，这是由于库仑相互作用引起的。对于具有半填充零能级的完全对称情况，对于双层和单层石墨烯都发现了与库仑相互作用能成比例的能量分裂。

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