Condensed Matter Physics Seminar

Thursday, November 4, 1999, 2 p.m.
Plant Sciences Building, Room 1130

The So-Called 2D Metal-Insulator Transition: An Old Story in a New Hat?

Sankar Das Sarma

(University of Maryland)

Abstract:  Providing an entirely subjective introduction to the currently frenziedly active field of the low density metal-insulator transition in two dimensional (2D) electron gas systems, I will attempt to critically discuss what is new and what is not, and distinguish what is interesting (and perhaps even important) from what is not.  The talk will concentrate on the actual data instead of speculating on the possible (and, by definition, unknown) zero-temperature phases of the system.  I will deconstruct several popular (and wildly speculative) theoretical scenarios, and discuss how the temperature and magnetic field dependent resistivity may be explained from the perspective of semiconductor transport theories taking into account the peculiarities of the specific 2D systems under study.  I will conclude by emphasizing what, in my opinion, is understood in this problem and what remains to be explained.

Back to Condensed Matter Physics Seminar Home Page