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 $B=0\mathrm{}$ 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. Bønsager et al. [Phys. Rev. Lett. 77, 1366 (1996)] who predicted a similar behavior caused by the interplay of screening and Landau quantization.

• Received 3 September 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.1763