Building graphene quantum Hall antidot molecules

Quantum Hall systems are promising platforms to study exotic interaction-induced quasiparticles which are not accessible in other condensed matter systems. A quantum Hall antidot, where quantum Hall edge channel encircles a potential hill and forms quantized energy levels, offers a promising approach for localizing and manipulating individual quasiparticles. While there have been promising developments in charge transport study of single antidot “atom”, creating controllable and quantum coherent multiple QH quasiparticles systems remains limited and challenging. Here we will discuss our recent effort in creating and studying a quantum Hall antidot “molecule” fabricated on graphene. With these devices we study characteristic quantum tunneling spectrum which reveals their molecular electronic properties, under tunable coupling through the electric and magnetic field. Our work lay the foundation for realizing novel quantum simulators for the study of strongly correlated electrons and anyonic quantum statistics.