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Multiple-path interferometer with a single quantum obstacle .

Schomerus, H. and Noat, Y. and Dalibard, J. and Beenakker, C. W. J. (2002) Multiple-path interferometer with a single quantum obstacle . Europhysics Letters, 57. pp. 651-10682.

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    Abstract

    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.

    Item Type: Article
    Journal or Publication Title: Europhysics Letters
    Subjects: UNSPECIFIED
    Departments: Faculty of Science and Technology > Physics
    ID Code: 686
    Deposited By: Dr Henning Schomerus
    Deposited On: 31 Oct 2007
    Refereed?: Yes
    Published?: Published
    Last Modified: 26 Jul 2012 18:18
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/686

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