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 . EPL, 57. pp. 651-10682. ISSN 1286-4854

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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:
Journal Article
Journal or Publication Title:
EPL
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
686
Deposited By:
Deposited On:
31 Oct 2007
Refereed?:
Yes
Published?:
Published
Last Modified:
05 Aug 2020 01:16