Study on Coherent Transport Characteristics in Quantum Hall Antidot with Tunable Gates

In a quantum hall (QH) antidot, the QH edge modes are confined to the circumference of the antidot, forming quantized energy levels. QH antidots allow the study of localized QH quasiparticles, such as the anyonic exchanged statistics. A key step towards such study is to establish a reliable and tunable coupling to the QH antidot. Here we develop high quality hBN-encapsulated graphene QH antidot devices with gate tunable couplings to the charge reservoirs. These devices allow measurements of the impacts of coupling strength and dielectric screening on the quantum coherence, and serves as the basis for studying anyonic statistics in the fractional QH regime using the antidot setup.