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Landau levels and oscillator strength in a biased bilayer of graphene

机译:偏置石墨烯双层中的朗道能级和振荡器强度

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摘要

We obtain analytical expressions for the eigenstates and the Landau level spectrum of biased graphene bilayers in a magnetic field. The calculations are performed in the context of a four-band continuum model and generalize previous approximate results. Solutions are presented for the spectrum as a function of interlayer coupling, the potential difference between the layers, and the magnetic field. The explicit expressions allow us to calculate the oscillator strength and the selection rules for electric dipole transitions between the Landau states. Some transitions are significantly shifted in energy relative to those in an unbiased bilayer and exhibit a very different magnetic field dependence.
机译:我们获得了偏置石墨烯双层在磁场中的本征态和Landau能级谱的解析表达式。这些计算是在四波段连续模型的上下文中执行的,并且可以概括先前的近似结果。提出了作为层间耦合,层之间的电势差和磁场的函数的频谱解决方案。明确的表达式使我们能够计算振荡器强度以及Landau状态之间电偶极跃迁的选择规则。某些跃迁相对于无偏双层中的跃迁,其能量发生了显着变化,并且表现出非常不同的磁场依赖性。

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