Volume 57, Number 5, March 2002
|Page(s)||651 - 657|
|Published online||01 September 2002|
Multiple-path interferometer with a single quantum obstacle
Max-Planck-Institut für Physik
Nöthnitzer Str. 38, 01187 Dresden, Germany
2 Kamerlingh Onnes Laboratory, Universiteit Leiden P.O. Box 9504, 2300 RA Leiden, The Netherlands
3 Laboratoire Kastler Brossel, Département de Physique de l'Ecole Normale Supérieure 24 rue Lhomond, 75231 Paris, France
4 Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506 2300 RA Leiden, The Netherlands
Accepted: 14 December 2001
We consider the scattering of particles (kinetic energy ε) by an obstacle which tunnels coherently between two positions (tunnel splitting Δ), for arbitrary values of and scattering strength U. The obstacle mimics two classical scatterers at fixed positions when . Interference disappears when , but can be recovered if the elastic-scattering channel is detected only. At intermediate values of ε 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 because the particle can evade the obstacle systematically. We discuss the realization of a quantum obstacle in mesoscopic systems.
PACS: 05.60.Gg – Quantum transport / 03.65.Nk – Scattering theory / 42.25.Hz – Interference
© EDP Sciences, 2002
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