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VOLUME 62 (1995) | ISSUE 2 | PAGE 152
Metal-insulator transition in a two-dimensional hole gas in Si/SiGe heterostructures. Quantum or classical percolation?
We study the current-voltage characteristics in the magnetic-field-induced insulating state of a two-dimensional hole gas in low-mobility Si/SiGe heterostructures. The observed behavior of the I-V curves is explained in terms of the breakdown of the insulating phase in the classical percolation model. Analysis of all the experimental results obtained on different two-dimensional systems shows that none of them is in obvious contradiction with classical percolation. © 1995 American Institute of Physics.