Persistent currents with long-range hopping in 1D single-isolated-diffusive rings

Details Persistent currents with long-range hopping in 1D single-isolated-diffusive rings Persistent currents with long-range hopping in 1D single-isolated-diffusive rings

2004-09-08

arxiv.org/abs/cond-mat/0409189v3

Synthetic Metals, Volume 155, Issue 2, 15 November 2005, Pages 430-433

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1016/j.synthmet.2005.09.030

We show from exact calculations that a simple tight-binding Hamiltonian with diagonal disorder and long-range hopping integrals, falling off as a power $\mu$ of the inter-site separation, correctly describes the experimentally observed amplitude (close to the value of an ordered ring) and flux-periodicity ($hc/e$) of persistent currents in single-isolated-diffusive normal metal rings of mesoscopic size. Long-range hopping integrals tend to delocalize the electrons even in the presence of disorder resulting orders of magnitude enhancement of persistent current relative to earliar predictions.

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