Flow diagram of the metal-insulator transition in two dimensions

Details Flow diagram of the metal-insulator transition in two dimensions Flow diagram of the metal-insulator transition in two dimensions

2006-09-07

arxiv.org/abs/cond-mat/0609181v2

Nature Phys. (2007), doi:10.1038/nphys685

Physics

Condensed Matter

Strongly Correlated Electrons

as published

Scientific paper

10.1038/nphys685

The discovery of the metal-insulator transition (MIT) in two-dimensional (2D) electron systems challenged the veracity of one of the most influential conjectures in the physics of disordered electrons, which states that `in two dimensions, there is no true metallic behaviour'; no matter how weak the disorder, electrons would be trapped and unable to conduct a current. However, that theory did not account for interactions between the electrons. Here we investigate the interplay between the electron-electron interactions and disorder near the MIT using simultaneous measurements of electrical resistivity and magnetoconductance. We show that both the resistance and interaction amplitude exhibit a fan-like spread as the MIT is crossed. From these data we construct a resistance-interaction flow diagram of the MIT that clearly reveals a quantum critical point, as predicted by the two-parameter scaling theory (Punnoose and Finkel'stein, Science 310, 289 (2005)). The metallic side of this diagram is accurately described by the renormalization group theory without any fitting parameters. In particular, the metallic temperature dependence of the resistance sets in when the interaction amplitude reaches gamma_2 = 0.45 - a value in remarkable agreement with the one predicted by the theory.

Affiliated with

Also associated with

No associations

Rating

Flow diagram of the metal-insulator transition in two dimensions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Flow diagram of the metal-insulator transition in two dimensions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flow diagram of the metal-insulator transition in two dimensions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-317719