论文标题
在双层石墨烯中竞争的劳林州和wigner水晶
Competing Laughlin state and Wigner crystal in bilayer graphene
论文作者
论文摘要
我们研究了双层石墨烯中央兰道水平的分数量子厅效应。通过调整外部施加的磁场和两层之间的电偏差，可以访问一个政权，在兰道水平之间存在渐au级的变性，其轨道特征对应于n = 0和n = 1 galilean landau水平。尽管Laughlin状态通常是填充$ν= 1/3 $的基础状态，但我们发现它可以通过调整偏见和应用领域而在相同的填充因子上被Wigner Crystal销毁并取代。该竞赛不会在$ν= 2/3 $举行，而不可压缩状态保持稳定。电气诱导Wigner晶体状态的可能性为这种物质状态开辟了一系列新的研究。
We study the fractional quantum Hall effect in the central Landau level of bilayer graphene. By tuning the external applied magnetic field and the electric bias between the two layers one can access a regime where there is a degeneracy between Landau levels with orbital characters corresponding to N=0 and N=1 Galilean Landau levels. While the Laughlin state is generically the ground state for filling $ν=1/3$ we find that it can be destroyed and replaced by a Wigner crystal at the same filling factor by tuning the bias and applied field. This competition does not take place at $ν=2/3$ where the incompressible ground state remains stable. The possibility of electrically inducing the Wigner crystal state opens a new range of studies of this state of matter.
