Regensburg 2002 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

SYQT: Quantentransport auf molekularen Skalen

SYQT 3: Quantentransport auf molekularen Skalen

SYQT 3.4: Vortrag

Montag, 11. März 2002, 17:30–17:45, H2

Persistent currents and scattering phases in open rings: Inversion and time-reversal symmetry — •Juyeon Yi, Gianaurelio Cuniberti, and Markus Porto — Max-Planck-Institut fur Physik komplexer Systeme Nothnitzer Strasse 38 01187-Dresden

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 2π-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.