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Phys. Rev. B 71, 113312 (2005) [4 pages]

Quantum Hall line junction with impurities as a multislit Luttinger liquid interferometer

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I. Yang1, W. Kang1, L. N. Pfeiffer2, K. W. Baldwin2, K. W. West2, E.-A. Kim3, and E. Fradkin3
1James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
2Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974, USA
3Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA

Received 23 July 2004; published 29 March 2005

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 which 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.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.71.113312
DOI: 10.1103/PhysRevB.71.113312
PACS: 73.43.Jn, 73.43.Nq

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