Quantum Hall line junction with impurities as a multi-slit Luttinger liquid interferometer
arXiv:cond-mat/0407641 · doi:10.1103/PhysRevB.71.113312
Abstract
We report on quantum interference between a pair of counterpropagating quantum Hall edge states that are separated by a high quality tunnel barrier. Observed Aharonov-Bohm oscillations are analyzed in terms of resonant tunneling between coupled Luttinger liquids that creates bound electronic states between pairs of tunnel centers that act like interference slits. We place a lower bound in the range of 20-40 $μ$m for the phase coherence length and directly confirm the extended phase coherence of quantum Hall edge states.
4 pages, 3 figures, 1 table