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首页> 外文期刊>Physical review >Electromagnetic response and pseudo-zero-mode Landau levels of bilayer graphene in a magnetic field
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Electromagnetic response and pseudo-zero-mode Landau levels of bilayer graphene in a magnetic field

机译：磁场中双层石墨烯的电磁响应和伪零模Landau能级

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The electromagnetic response of bilayer graphene in a magnetic field is studied in comparison to that of monolayer graphene. Both types of graphene turn out to be qualitatively quite similar in dielectric and screening characteristics, especially those deriving from vacuum fluctuations, but the effect is generally much more sizable for bilayers. The presence of the zero-(energy-)mode Landau levels is a feature specific to graphene. In bilayers, unlike in monolayers, the effect of the zero-mode levels becomes visible and even dominant in density response as an externally controllable band gap develops. It is pointed out that the splitting of nearly degenerate pseudo-zero-mode levels at each valley, which are specific to bilayer graphene, is controlled by an applied inplane electric field or by an injected current. In addition, a low-energy effective gauge theory of bilayer graphene is constructed.
机译：与单层石墨烯相比，研究了双层石墨烯在磁场中的电磁响应。事实证明，这两种类型的石墨烯在介电和屏蔽特性上在质量上都非常相似，尤其是那些源自真空波动的石墨烯，但是对于双层而言，其效果通常要大得多。零（能量）模式朗道能级的存在是石墨烯特有的功能。在双层中，与在单层中不同，随着外部可控带隙的发展，零模能级的影响变得可见，甚至在密度响应中占主导地位。应当指出，双层石墨烯特有的在每个波谷处几乎简并的伪零模能级的分裂是由所施加的平面电场或注入电流控制的。另外，构建了双层石墨烯的低能效规理论。

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