Classical orbit bifurcation and quantum interference in mesoscopic magnetoconductance

We theoretically study the magnetoconductance of electrons through a mesosc opic channel with antidots. Through quantum interference effects, the condu ctance maxima as functions of the magnetic-field strength and the antidot r adius (regulated by the applied gate voltage) exhibit characteristic disloc ations that have been observed experimentally. Using the semiclassical peri odic orbit theory, we relate these dislocations directly to bifurcations of the leading classes of periodic orbits.