6533b7dbfe1ef96bd12715af
RESEARCH PRODUCT
Current-spin-density-functional study of persistent currents in quantum rings
P. Singha DeoSusanne ViefersStephanie ReimannM. KoskinenM. Manninensubject
PhysicsFormalism (philosophy of mathematics)Condensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsImpurityMesoscale and Nanoscale Physics (cond-mat.mes-hall)FOS: Physical sciencesCondensed Matter::Strongly Correlated ElectronsPersistent currentSpin densityCondensed Matter::Mesoscopic Systems and Quantum Hall EffectQuantumSpectral linedescription
We present a numerical study of persistent currents in quantum rings using current spin density functional theory (CSDFT). This formalism allows for a systematic study of the joint effects of both spin, interactions and impurities for realistic systems. It is illustrated that CSDFT is suitable for describing the physical effects related to Aharonov-Bohm phases by comparing energy spectra of impurity-free rings to existing exact diagonalization and experimental results. Further, we examine the effects of a symmetry-breaking impurity potential on the density and current characteristics of the system and propose that narrowing the confining potential at fixed impurity potential will suppress the persistent current in a characteristic way.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-05-03 | Physical Review B |