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Tunable Excitons in Bilayer Graphene with Opened Energy Gap

机译:双层石墨烯的可调谐激子,具有开放的能隙

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摘要

In this work we study excitonic absorption in bilayer graphene where an energy gap is opened by a static perpendicular electric field. On the basis of the tight-binding approach and second quantized Hamiltonian the linearized quantum kinetic equations for the density matrix are obtained. It is shown that the exciton binding energy and intensity of the excitonic absorption can be tuned by changing the value of the gap and tight-binding parameters. It is found that the account of circular asymmetry of the energy bands in bilayer graphene leads to a strong increase of exciton binding energy and excitonic absorption.
机译:在这项工作中,我们研究双层石墨烯中的兴奋性吸收,其中通过静态垂直电场打开能量隙。 基于紧密结合方法和第二量化Hamiltonian,获得了密度基质的线性化量子动力学方程。 结果表明,可以通过改变间隙和紧密结合参数的值来调谐激子结合能量和激发器吸收的强度。 发现双层石墨烯中能带循环不对称的叙述导致激子结合能量和激发器吸收的强烈增加。

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