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Anomalous Interlayer Transport of Quantum Hall Bilayers in the Strongly Josephson-Coupled Regime

Ding Zhang, Werner Dietsche, and Klaus von Klitzing
Phys. Rev. Lett. 116, 186801 – Published 2 May 2016

Abstract

We investigate Josephson coupling in a closely spaced quantum Hall bilayer. Reduction of the interlayer barrier from the widely used values of 10–12 nm to the present one of 8 nm leads to qualitatively different interlayer transport properties. The breakdown of interlayer coherence can be spatially confined in regions that are smaller than the device size. Such a spatial inhomogeneity depends crucially on the Josephson-coupling strength and can be removed by adding an in-plane magnetic field of about 0.5 T. At higher in-plane fields, the interlayer tunneling IV curve develops unexpected overshoot features. These results challenge current theoretical understanding and suggest that our bilayer system has entered a previously unexplored regime.

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  • Received 18 February 2016

DOI:https://doi.org/10.1103/PhysRevLett.116.186801

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Ding Zhang*, Werner Dietsche, and Klaus von Klitzing

  • Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

  • *Present address: State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.

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Issue

Vol. 116, Iss. 18 — 6 May 2016

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