Geometric and impurity effects on quantum rings in magnetic fields

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dc.creatorAichinger, M.
dc.creatorChin, S. A.
dc.creatorKrotscheck, E.
dc.creatorRasanen, E.
dc.date2006-03-29
dc.date.accessioned2026-07-07T07:05:05Z
dc.date.available2026-07-07T07:05:05Z
dc.descriptionWe investigate the effects of impurities and changing ring geometry on the energetics of quantum rings under different magnetic field strengths. We show that as the magnetic field and/or the electron number are/is increased, both the quasiperiodic Aharonov-Bohm oscillations and various magnetic phases become insensitive to whether the ring is circular or square in shape. This is in qualitative agreement with experiments. However, we also find that the Aharonov-Bohm oscillation can be greatly phase-shifted by only a few impurities and can be completely obliterated by a high level of impurity density. In the many-electron calculations we use a recently developed fourth-order imaginary time projection algorithm that can exactly compute the density matrix of a free-electron in a uniform magnetic field.
dc.description8 pages, 7 figures, to appear in PRB
dc.identifierhttps://arxiv.org/abs/cond-mat/0603795
dc.identifierhttp://arxiv.org/abs/cond-mat/0603795
dc.identifierPhys. Rev. B 73, 195310 (2006)
dc.identifierdoi:10.1103/PhysRevB.73.195310
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/109553
dc.subjectStrongly Correlated Electrons
dc.subjectMesoscale and Nanoscale Physics
dc.titleGeometric and impurity effects on quantum rings in magnetic fields
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