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Multiple-path interferometer with a single quantum obstacle .

By H. Schomerus, Y. Noat, J. Dalibard and C. W. J. Beenakker


We consider the scattering of particles (kinetic energy eps) by an obstacle which tunnels coherently between two positions (tunnel splitting Delta), for arbitrary values of eps/Delta and scattering strength U. The obstacle mimics two classical scatterers at fixed positions when eps lesseq Delta. Interference disappears when eps >> Delta, but can be recovered if the elastic-scattering channel is detected only. At intermediate values of eps there is a systematic interplay of the coherent tunnel motion and the ballistic particle motion. We show that the transmission probability can remain finite even in the limit U->infinity because the particle can evade the obstacle systematically. We discuss the realization of a quantum obstacle in mesoscopic systems

Year: 2002
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Provided by: Lancaster E-Prints

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