Non-Achievability of Metal-Insulator Transition in Two-Dimensional Systems

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2006,（4）
• 页码范围: 946-949
• 页数: 4页
• 语种: 英文

摘要

We present a simple demonstration of the non feasibility of metal-insulator transition in an exactly two-dimensional (2D) system. The Hartree-Fock potential in the 3D system is suitably modified and presented for the 2D case.The many body effects are included in the screening function, and binding energies of a donor are obtained as a function of impurity concentration so as to find out the possible way leading metal-insulator transition in the 2D system. While solving for the binding energy for a shallow donor in an isolated well of a GaAs/Ga1-x Als As superlattice system within the effective mass approximation, it leads to unphysical results for higher concentrations.