Abstract
We report the observation of a metal-insulator transition at in a high mobility two dimensional hole gas in a GaAs-AlGaAs heterostructure. A clear critical point separates the insulating phase from the metallic phase, demonstrating the existence of a well defined minimum metallic conductivity . The data either side of the transition can be “scaled” onto one curve with a single parameter . The application of a parallel magnetic field increases and broadens the transition. We argue that strong electron-electron interactions ( ) suppress quantum interference corrections to the conductivity.
- Received 19 September 1997
DOI:https://doi.org/10.1103/PhysRevLett.80.1292
©1998 American Physical Society