We report on magnetoconductance measurements of a submicrometer-wide constriction in a two-dimensional electron gas with a tunable central gate. For negative central gate biases, an edge channel loop forms around the central-gate potential hump and couples to reflected edge channels, opening a forward scattering pathway. From the conductance contribution of this pathway we deduce that the transmission probability for tunneling between adjacent edge channels of different Landau levels is 0.5, corresponding to the strong-coupling limit, for a coupling region of only a few hundred nanometers in length.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Oct 15 2001|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics