Abstract
We present transport measurements of electrons bound to the surface of superfluid 4He in a microchannel of width 10 μm. A set of electrodes 2 μm beneath the helium surface, fabricated in a split-gate configuration using electron beam lithography, are used to control the current along the microchannel as in a point contact device. As the split-gate bias V SG is swept negative the current decreases to zero. The value of V SG at which the current is suppressed is dependent on the AC driving voltage applied to the electron system. We explain our results using a simple model in which a potential barrier created by the split-gate electrodes must be overcome in order to allow current to flow in the microchannel. The control of electron transport in such confined geometries may offer new possibilities for mesoscopic experiments with electrons on the surface of liquid helium.
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