Metal-Insulator Transition in Strongly Interacting 2D Electron Systems
Xincheng Xie
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P.R. China and Oklahoma State University, USA
According to the scaling theory of localization, all quantum electronic states are localized in two-dimensional (2D) systems. One consequence of the theory is that there is no quantum percolation transition in 2D. However, in a real system at a finite temperature, electron phase coherent length is finite and the system is between quantum and classical. We find, in such a 2D system, a metal-insulator transition (MIT) caused by semi-classical percolation. The relevance to recently observed 2D MIT will also be discussed.