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| Paper IPM / Physic / 9596 |
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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-diference density response functions of neutral and doped BLG. These results demonstrate that BLG density-functions exhibit either single-component massive-chiral character or standard two-layer character, depending on energy and doping.
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