Abstract
We observe a strong modulation of the low temperature in-plane conductance of coupled quantum wells (QW's) by an in-plane magnetic field and attribute this to an anticrossing of the two QW dispersion curves. The anticrossing produces a partial energy gap, yielding large, -tunable distortions in the Fermi surface and density of states. Sweeping moves the energy gap through the Fermi level, with the upper and lower gap edges producing a sharp maximum and minimum in , in agreement with theoretical calculations. The gap energy is directly determined from the data.
- Received 16 May 1994
DOI:https://doi.org/10.1103/PhysRevLett.73.2256
©1994 American Physical Society