Competing Quantum Hall Phases in the Second Landau Level of 2D Electron Systems
New physics has had to be invoked to explain the existence of exotic quantum Hall states such as the n =5/2 and 7/2 states. Recent progress in fabrication of high-quality low-density samples allows one to probe these states in a new regime where the electron-electron interactions are strong. The results reveal the existence of anisotropic transport for n = 7/2 in a high-quality very dilute 2D electron system. The new behavior is attributed to a large Landau level mixing effect that perturbs the pairing stability of composite fermions in the dilute limit.
- Research Area: Quantum Fluids and Solids
- Research Initiatives: Materials
- Facility / Program: High B/T
- Year: 2014