论文标题
电场可调式带隙在相应的扭曲双层石墨烯中
Electric Field Tunable Band Gap in Commensurate Twisted Bilayer Graphene
论文作者
论文摘要
Bernal双层石墨烯具有带有电场红外线的带隙。我们表明，Sublattice奇数相称的扭曲双层石墨烯（C-TBG）表现出一个带有电场的Terahertz通过Terahertz进行调谐的带隙。我们表明，从Terahertz光学的角度来看，Sublattice Odd，甚至C-TBG的形式是“膨胀”版本的Bernal和AA堆叠的双层石墨烯，其能量尺度为21.79度的能量尺度降低了110度。这种较低的能量尺度伴随着相应较小的门电压，这意味着强场状态比在Bernal情况下更容易获得。最后，我们表明，层间相干能是通过幂律发散在光导率中的位置直接访问的实验量。
Bernal bilayer graphene exhibits a band gap that is tunable through the infrared with an electric field. We show that sublattice odd commensurate twisted bilayer graphene (C-TBG) exhibits a band gap that is tunable through the terahertz with an electric field. We show that from the perspective of terahertz optics the sublattice odd and even forms of C-TBG are "inflated" versions of Bernal and AA stacked bilayer graphene respectively with energy scales reduced by a factor of 110 for the 21.79 degree commensurate unit cell. This lower energy scale is accompanied by a correspondingly smaller gate voltage, which means that the strong-field regime is more easily accessible than in the Bernal case. Finally, we show that the interlayer coherence energy is a directly accessible experimental quantity through the position of a power-law divergence in the optical conductivity.
