Probing quantum Hall edge chirality and the anyonic exchange angle with a three-path interferometer
The authors developed an average-current interferometer to measure directional causal responses in fractional quantum Hall edge excitations. They showed that while scaling dimension is fixed, the exchange angle of a tunneling vertex can be reconstructed by measuring amplitude ratios. This allows for distinguishing between different quasiparticle types at specific points, revealing fundamental properties of anyonic exchange.