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

Ding Zhang; Werner Dietsche; Klaus von Klitzing

doi:10.1103/PhysRevLett.116.186801

← Back to search

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

Ding Zhang, Werner Dietsche, Klaus von Klitzing

DOI 10.1103/PhysRevLett.116.186801 · Physical Review Letters

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

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 I−V curve develops unexpected overshoot features. These results challenge current theoretical understanding and suggest that our bilayer system has entered a previously unexplored regime.