Abstract
Magnetic-field-induced transition from insulator to quantum Hall liquid is observed in a two-dimensional electron gas system with a triangular lattice of small circular depletion regions (antidots). In the insulating regime the localization length is close to the antidot lattice constant at zero magnetic field and oscillates with a period of h/2 e as a function of magnetic flux threading through the unit cell of the antidot lattice. A sample shows resistivity oscillations with a period of h/ e at high magnetic field where the filling factor for Landau levels is less than unity. The high-field oscillations may result from the quantization of composite fermion orbits around an antidot.
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