A central role for the exchange-correlation hole in the 2D metal-insulator transition

Details A central role for the exchange-correlation hole in the 2D metal-insulator transition A central role for the exchange-correlation hole in the 2D metal-insulator transition

2000-10-11

arxiv.org/abs/cond-mat/0010156v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 figures

Scientific paper

The 2D metal-insulator transition can be induced either by decreasing the carrier density or by increasing the spin polarization by applying a magnetic field parallel to the plane. Using experimental results for the shift in critical carrier density in an applied field, we show that the two-electron pair correlation function at short distance ($k_Fr\alt2$) has a universal form along the transition line in the magnetic field-carrier density plane. This result provides direct evidence of the central role of Coulomb repulsion and the exchange-correlation hole in driving the metal-insulator transition.

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