MAGNETORESISTANCE AND TEMPERATURE EFFECTS IN DOT-LIKE LATERAL SURFACESUPERLATTICES

The magnetotransport in dotlike lateral surface superlattices is inves tigated as a function of Fermi energy and temperature. At low magnetic fields, the magnetoresistance shows a well-defined negative different ial behavior, which is followed by one or two large peaks. In this reg ime, Hall measurements indicate that the number of electrons that cont ribute to the current depends strongly on the applied magnetic field. Moreover, a clear negative temperature coefficient of the magnetoresis tance is observed. Both effects are explained in terms of a semiclassi cal picture.