Quantum Hall line junction with impurities as a multi-slit Luttinger liquid interferometer
I. Yang, W. Kang, L. N. Pfeiffer, K. W. Baldwin, K. W. West, Eun-Ah Kim, E. Fradkin
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 μm for the phase coherence length and directly confirm the extended phase coherence of quantum Hall edge states.
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