Abstract
Here we discuss the possibility of an alternative rectifying structure which operates in the world of mesoscopic devices. A simple quantum constriction (wide–narrow geometry) is found to act as a rectifier in the coherent transport regime if Fermi energy is between the propagation thresholds of the wide and narrow parts. Also a quantum structure is proposed which is predicted to operate as a rectifier at room temperatures. This diode for the nanostructures is a quantum wire with an asymmetric quantum constriction (AQC) which works in the coherent transport regime. Structurally imperfect mesoscopic diodes retain rectifying features, although the actual I–V characteristics are different in comparison to the perfect devices.
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