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Two-level quantum dot in the Aharonov-Bohm ring. Towards understanding "phase lapse"

Stefański P.

Materials Science Poland

2007

Vol. 25, No. 4

1243--1249

It is shown theoretically that indirect interaction between two quantum dot levels can generate an anomalous phase shift for a system of the dot placed in one of the arms of the Aharonov-Bohm ring. The interaction between levels arises from the non-conservation of the orbital quantum number during the hopping process of electrons between the levels and leads. Such an unusual "phase lapse" behavior is observed experimentally and still lacks of proper theoretical description.