Journal
PHYSICAL REVIEW LETTERS
Volume 96, Issue 21, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.96.216407
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We perform combined resistivity and compressibility studies of two-dimensional hole and electron systems which show the apparent metal-insulator transition-a crossover in the sign of partial derivative R/partial derivative T with changing density. No thermodynamic anomalies have been detected in the crossover region. Instead, despite a tenfold difference in r(s), the compressibility of both electrons and holes is well described by the theory of nonlinear screening of the random potential. We show that the resistivity exhibits a scaling behavior near the percolation threshold found from analysis of the compressibility. Notably, the percolation transition occurs at a much lower density than the crossover.
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