Coherence Network in the Quantum Hall Bilayer

Journal Article · Fri Oct 07 04:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.156802· OSTI ID:20696549

Fertig, H A ^[1]; Murthy, Ganpathy ^[2]

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1. Department of Physics, Indiana University, Bloomington, Indiana 47405 (United States)
2. Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)

Recent experiments on quantum Hall bilayers near total filling factor 1 have demonstrated that they support an imperfect two-dimensional superfluidity, in which there is nearly dissipationless transport at nonvanishing temperature observed both in counterflow resistance and interlayer tunneling. We argue that this behavior may be understood in terms of a coherence network induced in the bilayer by disorder, in which an incompressible, coherent state exists in narrow regions separating puddles of dense vortex-antivortex pairs. A renormalization group analysis shows that it is appropriate to describe the system as a vortex liquid. We demonstrate that the dynamics of the nodes of the network leads to a power law temperature dependence of the tunneling resistance, whereas thermally activated hops of vortices across the links control the counterflow resistance.

• OSTI ID: 20696549
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANNIHILATION OPERATORS
EIGENSTATES
HALL EFFECT
QUANTUM MECHANICS
RENORMALIZATION
SUPERFLUIDITY
TEMPERATURE DEPENDENCE
TUNNEL EFFECT
TWO-DIMENSIONAL CALCULATIONS
VORTICES