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Energy-momentum dispersion relation of plasmarons in bilayer graphene

机译:等离子体石墨烯在双层石墨烯中的能量-动量色散关系

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The relation between the energy and momentum of plasmarons in bilayer graphene is investigated within the Overhauser approach, where the electron-plasmon interaction is described as a field theoretical problem. We find that the Dirac-like spectrum is shifted by ΔE(k) ~ 100 ÷ 150 meV depending on the electron concentration n-e and electron momentum. The shift increases with electron concentration as the energy of plasmons becomes larger. The dispersion of plasmarons is more pronounced than in the case of single layer graphene, which is explained by the fact that the energy dispersion of electrons is quadratic and not linear. We expect that these predictions can be verified using angle-resolved photoemission spectroscopy (ARPES).
机译:在Overhauser方法中研究了双层石墨烯中等离子体激元的能量与动量之间的关系,其中电子-等离子体相互作用被描述为一个场论问题。我们发现,视电子浓度n-e和电子动量而定,狄拉克样谱的位移为ΔE(k)〜100÷150 meV。随着等离激元能量变大,位移随电子浓度而增加。与单层石墨烯的情况相比,等离激元的色散更明显,这可以解释为电子的能量色散是二次方而不是线性的。我们希望可以使用角度分辨光发射光谱(ARPES)验证这些预测。

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