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We explore electron transport properties in a quantum wire attached to twometallic electrodes. A simple tight-binding model is used to describe thesystem and the coupling of the wire to the electrodes (source and drain) istreated through Newns-Anderson chemisorption theory. In our present model, thesite energies of the wire are characterized by the relation $\epsilon_i=W\cos(i\lambda^{\nu}\pi)$ where $W$, $\lambda$, $\nu$ are three positive numbers. For$\nu=0$, the threshold bias voltage of electron conduction across the bridgecan be controlled very nicely by tuning the strength of the potential $W$. Onthe other hand, for $\nu \ne 0$, the wire becomes an aperiodic one and quiteinterestingly we see that, for some special values of $\nu$, the systemexhibits a {\em metal-insulator} transition which provides a significantfeature in this particular study. Our numerical results may be useful forfabrication of efficient switching devices.

Tuning of electron transport through a quantum wire: An exact study