The anomalous conducting phase that has been shown to exist in zero field in dilute two-dimensional electron systems in silicon metal-oxide-semiconductor field effect transistors is driven into a strongly insulating state by a magnetic field of about 20 kOe applied parallel to the plane. The data suggest that in the limit of T→0 the conducting phase is suppressed by an arbitrarily weak magnetic field.
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Simonian et al. (1997) studied this question.