Ballistic devices have received increasing attention for their nonlinear electrical properties, which are interesting from both physics and application points of view. Recently, novel nonlinear electrical properties of three-terminal ballistic junctions (TBJs) have been discovered theoretically [1] and experimentally [2,3]. One of the features of these novel electrical properties is that if finite voltages V{sub}L and V{sub}R are applied to the left and right branches of a symmetric TBJ in push-pull fashion, with V{sub}L = -V{sub}R, the voltage at the central branch will always be negative.
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