Anomalous Quantum Diffusion in Order-Disorder Separated Double Quantum Ring

Details Anomalous Quantum Diffusion in Order-Disorder Separated Double Quantum Ring Anomalous Quantum Diffusion in Order-Disorder Separated Double Quantum Ring

2009-09-08

arxiv.org/abs/0909.1378v1

Journal of Computational and Theoretical Nanoscience, Volume 5, Number 11, November 2008, pp. 2135-2139(5)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 3 figures

Scientific paper

10.1166/jctn.2008.1109

A novel feature for control of carrier mobility is explored in an order-disorder separated double quantum ring, where the two rings thread different magnetic fluxes. Here we use simple tight-binding formulation to describe the system. In our model, the two rings are connected through a single bond and one of the rings is subjected to impurity, keeping the other ring as impurity free. In the strong impurity regime, the electron diffusion length increases with the increase of the impurity strength, while it decreases in the weak impurity regime. This phenomenon is completely opposite to that of a conventional disordered double quantum ring, where the electron diffusion length always decreases with the increase of the disorder strength.

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