title: Droplet state and the compressibility anomaly in dilute 2D electron systems.
abstract: We investigate the space distribution of carrier density and the compressibility of two-dimensional (2D) electron systems by using the local density approximation. The strong correlation is simulated by the local exchange and correlation energies. A slowly varied disorder potential is applied to simulate the disorder effect. We show that the compressibility anomaly observed in 2D systems which accompanies the metal-insulator transition can be attributed to the formation of the droplet state due to a disorder effect at low carrier densities.
authors.affiliation: Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
authors.forename: Junren
authors.initials: J
authors.lastname: Shi
authors.forename: X C
authors.initials: XC
authors.lastname: Xie