Metal-insulator transition in a 2D electron gas: Equivalence of two approaches for determining the critical point

Details Metal-insulator transition in a 2D electron gas: Equivalence of two approaches for determining the critical point Metal-insulator transition in a 2D electron gas: Equivalence of two approaches for determining the critical point

2000-09-12

arxiv.org/abs/cond-mat/0009180v5

Phys. Rev. Lett. 87, 266402 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

As published

Scientific paper

10.1103/PhysRevLett.87.266402

The critical electron density for the metal-insulator transition in a two-dimensional electron gas can be determined by two distinct methods: (i) a sign change of the temperature derivative of the resistance, and (ii) vanishing activation energy and vanishing nonlinearity of current-voltage characteristics as extrapolated from the insulating side. We find that in zero magnetic field (but not in the presence of a parallel magnetic field), both methods give equivalent results, adding support to the existence of a true zero-field metal-insulator transition.

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