Anomalous phase shift in a twisted quantum loop

Details Anomalous phase shift in a twisted quantum loop Anomalous phase shift in a twisted quantum loop

2010-06-27

arxiv.org/abs/1006.5180v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 paes, 5 figures

Scientific paper

Coherent motion of electrons in a twisted quantum ring is considered to explore the effect of torsion inherent to the ring. Internal torsion of the ring composed of helical atomic configuration yields a non-trivial quantum phase shift in the electrons' eigenstates. This torsion-induced phase shift causes novel kinds of persistent current flow and an Aharonov-Bohm like conductance oscillation. The two phenomena can occur even when no magnetic flux penetrates inside the twisted ring, thus being in complete contrast with the counterparts observed in untwisted rings.

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