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Transmittance anomalies of a ring with broken inversion-symmetry
J. Yi , G. Cuniberti, M. Porto
Deutsche Physikalische Gesellschaft, AKF Frühjahrstagung 2002 German Physical Society, Spring Meeting 2002 (Symposium Quantum Transport at Molecular Scale)
2002.03.11-15; Regensburg, Germany
| We investigate persistent currents and scattering
phases in one-dimensional rings coupled to external
leads, with paying attention to the role of
inversion-symmetry and a threading magnetic flux. It
is found that for a Aharonov-Bohm ring there exist
flux-independent perfect transmission and reflection,
leading to giant persistent current when the energy
approaches to those singular points. Interestingly,
the transmittance oscillation driven by the magnetic
flux can also be manifested with related to inversion
symmetry broken by different upper-and lower-branch
length. In this case, characteristic double-zero
points show up in the transmittance, accompanied by
2p-jumps in a transmittance phase. We also examine how
time-reversal symmetry affect the transmission
properties by considering a system in which both
broken inversion-symmetry and a magnetic flux are
presented.
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Prof. Dr. Gianaurelio Cuniberti
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Institute for Materials Science
TU Dresden
01062 Dresden, Germany
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