Abstract
We show that the spin degree of freedom plays a decisive role in the phase diagram of the bilayer electron system using an in-plane field in the regime of negligible tunneling. We observe that the phase boundary separating the quantum Hall and compressible states at for (: interlayer distance, : magnetic length) steadily shifts with before saturating at when the compressible state becomes fully polarized. Using a simple model for the energies of the competing phases, we can quantitatively describe our results. A new phase diagram as a function of and the Zeeman energy is established and its implications as to the nature of the phase transition are discussed.
- Received 23 March 2007
DOI:https://doi.org/10.1103/PhysRevLett.100.106803
©2008 American Physical Society