2023/08/08(Tue) 14:00 -16:00 五樓第一會議室 5F, 1st Meeting Room
Title
High-Resolution Tunneling Spectroscopy of Fractional Quantum Hall States
Speaker
崔彥宸先生 (普林斯頓大學物理學系) Mr. Yen-Chen Tsui (Department of Physics, Princeton University)Abstract
Strong interaction among electrons in two-dimensional systems in the presence of high magnetic fields gives rise to fractional quantum Hall (FQH) states that host quasi-particles with fractional charge and statistics. We perform high-resolution scanning tunneling microscopy and spectroscopy of FQH states in ultra-clean Bernal-stacked bilayer graphene (BLG) devices. Our experiments show that the formation of FQH states coincides with the appearance of sharp excitations in tunneling experiments. From these measurements and their comparison to theoretical calculations, we find large local energy gaps that protect quasi-particles of FQH states predicted to host non-abelian anyons, making BLG an ideal setting for the exploration of these novel quasi-particles. STM studies not only provide a way to characterize the bulk properties of FQH states in the absence of disorder but also reveal previous undiscovered states in such ultra-clean samples.
Language
演講語言 (Language): in English