Bend conductance of crossed wires in the presence of Andreev scattering

Abstract

We study the 4-probe bend conductance $G_{14,32}$ of a mesoscopic crossed wire structure in the ballistic regime in the absence of a magnetic field, which for normal devices is usually negative. We predict that for sufficiently large devices and for small applied voltages $G_{14,32}$ becomes positive in the presence of Andreev scattering, but at large voltages $G_{14,32}$ remains negative.

9 pages, 1 postscript figure available on request to [email protected] (Simon Robinson), LaTex version 2.09