Enhancement and suppression of tunneling by controlling symmetries of a potential barrier

Details Enhancement and suppression of tunneling by controlling symmetries of a potential barrier Enhancement and suppression of tunneling by controlling symmetries of a potential barrier

2010-06-04

arxiv.org/abs/1006.0905v2

Phys.Rev.A82:052112,2010

Physics

Quantum Physics

10 pages and 7 figures

Scientific paper

10.1103/PhysRevA.82.052112

We present a class of 2D systems which shows a counterintuitive property that contradicts a semi classical intuition: A 2D quantum particle "prefers" tunneling through a barrier rather than traveling above it. Viewing the one particle 2D system as the system of two 1D particles, it is demonstrated that this effect occurs due to a specific symmetry of the barrier that forces excitations of the interparticle degree of freedom that, in turn, leads to the appearance of an effective potential barrier even though there is no "real" barrier. This phenomenon cannot exist in 1D.

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