Current-spin-density functional study of persistent currents in quantum rings
Abstract
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.
Cite
@article{arxiv.cond-mat/0005078,
title = {Current-spin-density functional study of persistent currents in quantum rings},
author = {S. Viefers and P. Singha Deo and S. M. Reimann and M. Manninen and M. Koskinen},
journal= {arXiv preprint arXiv:cond-mat/0005078},
year = {2009}
}
Comments
7 pages REVTeX, including 8 postscript figures