双层石墨烯的动力学响应函数和集体模
Dynamical response functions and collective modes of bilayer graphene
摘要：
双层石墨烯（BLG）由于其独特的电子结构和可电调的能隙，近年来引起了人们的广泛关注。在这封信中，我们提出了分析和半解析表达式，基于四带连续模型，层和层差密度响应函数的中性和掺杂BLG。这些结果表明，BLG密度涨落可以表现出单组分的双手性特征或标准的两层特征，这取决于能量和掺杂。
英文摘要：
Bilayer graphene (BLG) has recently attracted a great deal of attention because of its electrically tunable energy gaps and its unusual electronic structure. In this Letter we present analytical and semi-analytical expressions, based on the four-band continuum model, for the layer-sum and layer-difference density response functions of neutral and doped BLG. These results demonstrate that BLG density-fluctuations can exhibit either single-component massive-chiral character or standard two-layer character, depending on energy and doping.
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