Persistent and radiation-induced currents in distorted narrow quantum rings are theoretically investigated. We show that ring distorsions can be described using a geometrical potential term. We analyze the effect of this term on the current induced by a magnetic flux (persistent current) and by a polarized coherent electromagnetic field (radiation-induced current). The strongest effects in persistent currents are observed for distorted rings with a small number of electrons. The distortion smoothes the current oscillations as a function of the magnetic flux and changes the temperature dependence of the current amplitude. For radiation-induced currents, the distortion induces an ac component in the current and affects its dependence on the radiation frequency and intensity.
Published in Physical Review B, ed. Gene D. Sprouse, Volume 72, Issue 12, 2005, pages 125348-1-125348-7.
Pershin, Y. V., & Piermarocchi, C. (2005). Persistent and radiation-induced currents in distorted quantum rings. Physical Review B, 72(12), 125348-1 - 125348-7. DOI: 10.1103/PhysRevB.72.125348
© Physical Review B, 2005, American Physical Society