Details

Autor(en) / Beteiligte

• Schomerus, H
• Noat, Y
• Dalibard, J
• Beenakker, C. W. J

Titel

Multiple-path interferometer with a single quantum obstacle

Ist Teil von

• Europhysics letters, 2002-03, Vol.57 (5), p.651-657

Ort / Verlag

Les Ulis: IOP Publishing

Erscheinungsjahr

2002

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 $\varepsilon/\Delta$ and scattering strength U. The obstacle mimics two classical scatterers at fixed positions when $\varepsilon\lesssim \Delta$. Interference disappears when $\varepsilon \gg \Delta$, 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 $U\rightarrow\infty$ because the particle can evade the obstacle systematically. We discuss the realization of a quantum obstacle in mesoscopic systems.