Abstract
An electron stub tuner (EST) consists of a quantum wire to which is attached a lateral branch or stub of finite length that can be controlled by a gate. The quantum interference between electron waves in the stub and the wire makes the transmission, as a function the stub length, vary periodically between zero and one when one mode is present in the wire. We consider superlattices composed of EST units and show how with a suitable choice of unit cell the transmission can have a form approaching a square wave, which is desirable for applications such as analog-to-digital converters. A unit cell composed of a double stub or crossbar geometry is particularly promising in this regard. We also consider the multi-mode case and show how periodic patterns involving several transmission plateaus are possible.
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