Phase of Aharonov-Bohm oscillations in conductance of mesoscopic systems

Details Phase of Aharonov-Bohm oscillations in conductance of mesoscopic systems Phase of Aharonov-Bohm oscillations in conductance of mesoscopic systems

1996-06-10

arxiv.org/abs/cond-mat/9606062v1

Physics

Condensed Matter

Figure available on request

Scientific paper

Motivated by a recent experiment we analyze in detail the phase of Aharonov-Bohm oscillations across a 1D ring with a stub coupled to one of its arms, in the presence of a magnetic flux. We demonstrate that there are two kinds of conductance extremas. One class of them are fixed at particular flux values and can only change abruptly from a maxima to a minima as incident energy is varied. We show a different mechanism for such abrupt phase change in conductance oscillation. We demonstrate that these extremas can exhibit $``$phase locking". However, the second kind of extremas can shift continuously as the incident energy is varied.

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