论文标题
相关边缘的扭曲双双层石墨烯系统中的可调带宽和差距
Tunable bandwidths and gaps in twisted double bilayer graphene system on the verge of correlations
论文作者
论文摘要
我们在小角度扭曲的双双层石墨烯中使用温度依赖性电阻率来测量频带的带宽和间隙。该电子孔不对称系统具有一组非分散带，该带与电场分成两个平坦带 - 与扭曲的双层系统不同。使用电场，单调的两个新兴扁平带之间的差距会增加，带宽从1 MEV调整到15 MeV。这两个具有间隙的平坦带导致一系列热诱导的绝缘子到金属过渡 - 我们使用电荷中立的模型，仅使用传输测量值测量带宽。有两个具有可调差距和带宽的平面乐队提供了一个机会来探测相关的出现。
We use temperature-dependent resistivity in small-angle twisted double bilayer graphene to measure bandwidths and gaps of the bands. This electron-hole asymmetric system has one set of non-dispersing bands that splits into two flat bands with the electric field - distinct from the twisted bilayer system. With electric field, the gap between two emergent flat bands increases monotonically and bandwidth is tuned from 1 meV to 15 meV. These two flat bands with gap result in a series of thermally induced insulator to metal transitions - we use a model, at charge neutrality, to measure the bandwidth using only transport measurements. Having two flat bands with tunable gap and bandwidth offers an opportunity to probe the emergence of correlations.
