This work seems to be getting a lot press. The question on whether we can have metallic behavior in 2D has been answered, and it is a YES!
An earlier theory indicated that charge carriers cannot exhibit metallic behavior, no matter how disordered the system is, in 2D. However, that scenario does not include the electron-electron interactions, which in Fermi Liquid theory has been renormalized. The new discovery and the accompanying theory indicates that one can have a metal-insulator transition in such a system, and points to the existence of a quantum critical point.
Zz.
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