Röösli Marc P, Hug Michael, Nicolí Giorgio, Märki Peter, Reichl Christian, Rosenow Bernd, Wegscheider Werner, Ensslin Klaus, Ihn Thomas
Solid State Physics Laboratory, Department of Physics, ETH Zurich, 8093 Zurich, Switzerland.
Institute for Theoretical Physics, Leipzig University Leipzig D-04009, Germany.
Sci Adv. 2021 May 7;7(19). doi: 10.1126/sciadv.abf5547. Print 2021 May.
In the fractional quantum Hall effect, the elementary excitations are quasi-particles with fractional charges as predicted by theory and demonstrated by noise and interference experiments. We observe Coulomb blockade of fractional charges in the measured magneto-conductance of a 1.4-micron-wide quantum dot. Interaction-driven edge reconstruction separates the dot into concentric compressible regions with fractionally charged excitations and incompressible regions acting as tunnel barriers for quasi-particles. Our data show the formation of incompressible regions of filling factors 2/3 and 1/3. Comparing data at fractional filling factors to filling factor 2, we extract the fractional quasi-particle charge / = 0.32 ± 0.03 and 0.35 ± 0.05. Our investigations extend and complement quantum Hall Fabry-Pérot interference experiments investigating the nature of anyonic fractional quasi-particles.
在分数量子霍尔效应中，如理论所预测并经噪声和干涉实验证明，基本激发是具有分数电荷的准粒子。我们在一个1.4微米宽的量子点的测量磁电导中观察到分数电荷的库仑阻塞。相互作用驱动的边缘重构将量子点分离为具有分数电荷激发的同心可压缩区域和作为准粒子隧道势垒的不可压缩区域。我们的数据显示了填充因子为2/3和1/3的不可压缩区域的形成。将分数填充因子下的数据与填充因子为2时的数据进行比较，我们提取出分数准粒子电荷e*/h = 0.32 ± 0.03和0.35 ± 0.05。我们的研究扩展并补充了研究任意子分数准粒子性质的量子霍尔法布里 - 珀罗干涉实验。
