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Surface carrier transport in Y nanojunctions: Signatures of the geometric potential

The effective potential originated by the nonplanar geometry of a two-dimensional electron gas (2DEG) modifies its coherent transport properties. To date no direct evidence of such purely geometric potential has been revealed. Here we expose its effects by computing the transmission characteristics of a semiconductor cylindrical 2DEG forming a Y junction. For some cylinder radii, we find that the activation thresholds of the transmission channels in the two drain leads are exchanged, with this effect being robust against the geometrical details of the three-terminal junction.