The frictional drag between parallel two-dimensional electron systems has been measured in a regime of strong interlayer correlations. When the bilayer system enters the excitonic quantized Hall state at total Landau level filling factor \nu_T=1 the longitudinal component of the drag vanishes but a strong Hall component develops. The Hall drag resistance is observed to be accurately quantized at h/e^2.
@article{arxiv.cond-mat/0108403,
title = {Observation of Quantized Hall Drag in a Strongly Correlated Bilayer Electron System},
author = {M. Kellogg and I. B. Spielman and J. P. Eisenstein and L. N. Pfeiffer and K. W. West},
journal= {arXiv preprint arXiv:cond-mat/0108403},
year = {2009}
}
Comments
4 pages, 3 figures. Version accepted for publication in Physical Review Letters. Improved discussion of experimental and theoretical issues, added references, correction to figure 3