Observation of Screening in the Magneto-Coulomb Drag between Coupled Two-Dimensional Electron Systems

Abstract

The coupling between two spatially separated two-dimensional electron gases is studied as a function of magnetic field $B$. We find oscillations in the transresistivity ${R}_{T}$, which are up to 2 orders of magnitude enhanced compared to the $B\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ case. ${R}_{T}$ vanishes in the regime of a quantum Hall plateau and shows a twin-peaked structure in the inter-plateau regions. This observation is in good agreement with a recent theory by M. C. B\o{}nsager et al. [Phys. Rev. Lett. 77, 1366 (1996)] who predicted a similar behavior caused by the interplay of screening and Landau quantization.