论文标题
在部分填充的Landau水平上对每个粒子的能量的实验确定
Experimental determination of the energy per particle in partially filled Landau levels
论文作者
论文摘要
我们描述了一种实验技术，用于测量具有高灵敏度和静态极限的原子较薄的分层材料的化学电位$μ$。我们将技术应用于高质量的石墨烯单层，以在n = 0和n = 1 landau水平的高磁场上绘制出$μ$的演变。通过在填充因子（$ν$）上集成$μ$，我们获得每个粒子的基态能量，可以将其直接与数值计算进行比较。在n = 0兰道级别中，我们的数据显示了与整个Landau级别的数值计算相同的一致性，而无需可调参数，只要考虑了填充的Landau级别对库仑相互作用进行筛选。在N = 1 Landau级别中，实验数据和数值数据之间的比较揭示了山谷各向异性相互作用的重要性以及在奇数填充附近的山谷纹理电子固体的存在。
We describe an experimental technique to measure the chemical potential, $μ$, in atomically thin layered materials with high sensitivity and in the static limit. We apply the technique to a high quality graphene monolayer to map out the evolution of $μ$ with carrier density throughout the N=0 and N=1 Landau levels at high magnetic field. By integrating $μ$ over filling factor, $ν$, we obtain the ground state energy per particle, which can be directly compared with numerical calculations. In the N=0 Landau level, our data show exceptional agreement with numerical calculations over the whole Landau level without adjustable parameters, as long as the screening of the Coulomb interaction by the filled Landau levels is accounted for. In the N=1 Landau level, comparison between experimental and numerical data reveals the importance of valley anisotropic interactions and the presence of valley-textured electron solids near odd filling.
