Evenly curved two-dimensional electron systems in rolled-up Hall bars

We present evenly curved two-dimensional electron systems in Hall-bar geometry. Expanding the method of self-rolling strained layers to fragile thickness modulated layer systems enables us to roll-up complete Hall-bar geometries into microscrolls. These structures represent model systems for the investigation of transport phenomena in sinusoidally modulated magnetic fields. The sinusoidal shape of the modulation and the tunability of the modulation phase are illustrated by comparing finite element calculations with transport data in the classical regime. Furthermore, we demonstrate the tunability of the carrier density in our structures using rolled-in metal gates. (c) 2006 American Institute of Physics.