Feasibility Study of a Quantum Field-Effect Directional Coupler

在本提案中，主要研究者将研究 量子场效应定向耦合器（QFED） QFED是一个 一种旨在利用电子波动特性的装置 局限于非常小的半导体结构。 QFED由 基本上由两个足够接近的平行电子波导组成 间隔一定长度（相互作用长度）， 电子可以从一个波导传输到另一个波导 量子力学隧穿 在QFED中，电子转移 在两个波导之间交替地作为电子波包 沿着耦合器向下传播。 对于耦合器来说， 从一个波导到另一个波导的电子分数，耦合 可以控制波导之间的距离而不改变它们的 相互作用长度 这是通过场效应作用实现的， 金属门贯穿耦合器的中间。 QFED 作为一个电流开关，很像一个完整的发射极耦合器逻辑 门

In this proposal the principal investigator will study the feasibility of a Quantum Field-Effect Directional Coupler (QFED). The QFED is a proposed device that intends to exploit the wave nature of electrons confined to a very small semiconductor structures. The QFED consists basically of two parallel electron waveguides sufficiently closely spaced over a certain length (the interaction length) so that electrons can be transferred from one waveguide to the other by quantum mechanical tunneling. In a QFED, electrons transfer alternatively between the two waveguides as the electron wave packet travels down the coupler. For a coupler to transfer any given fraction of the electrons from one waveguide to the other, coupling between the waveguides can be controlled without changing their interaction length. This is achieved by the field-effect action of a metal gate running through the middle of the coupler. The QFED behaves as a current switch, much like an entire Emitter-Coupler Logic gate.