Phonon-mediated drag at $ν=1/2$: A test of the Chern-Simons composite fermion theory

Details Phonon-mediated drag at $ν=1/2$: A test of the Chern-Simons composite fermion theory Phonon-mediated drag at $ν=1/2$: A test of the Chern-Simons composite fermion theory

2000-03-03

arxiv.org/abs/cond-mat/0003048v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages (including 7 figures)

Scientific paper

10.1103/PhysRevB.62.10940

We report on a study of the phonon-mediated frictional drag between two-dimensional electron layers at the Landau level filling factor $\nu=1/2$ predicted by Chern-Simons composite-fermion theory. Frictional drag between widely spaced layers is dominated by the phonon-mediated interaction and is altered from its zero-field form because of the large composite-fermion effective mass and, less strongly, by magnetic local-field effects. We find that the reduced drag resistance $\rho(T)/T^2$ peaks at a larger temperature and has a different density dependence than at zero field. We compare these results with recent experimental findings.

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