Abstract
The Hall voltage in narrow high-mobility samples at low magnetic fields depends strongly on the geometry of the junction used to measure it. It can be quenched, enhanced or even negative. At high fields and low temperatures, dips appear in quantum Hall plateaux when the junction is almost isolated. This can be explained as a magnetic diffraction effect. We report preliminary observations of large oscillations as a function of gate voltage when a junction is surrounded by tunnel barriers. These are probably caused by the Coulomb Blockade of single electron tunnelling.
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