Abstract
At small layer separations, the ground state of a bilayer quantum Hall system exhibits spontaneous interlayer phase coherence. The evolution of this state with increasing layer separation has been a matter of controversy. We report on small system exact diagonalization calculations which suggest that a single-phase transition, likely of first order, separates incompressible states with strong interlayer correlations from compressible states with weak interlayer correlations. We find a dependence of the phase boundary on and interlayer tunneling amplitude that is in very good agreement with recent experiments.
- Received 20 June 2000
DOI:https://doi.org/10.1103/PhysRevLett.86.1849
©2001 American Physical Society