Stable switch action based on quantum interference effect

Abstract

Although devices working on quantum principles can revolutionize the electronic industry, they have not been achieved yet as it is difficult to control their stability. We show that one can use evanescent modes to build stable quantum switches. The physical principles that make this possible is explained in detail. Demonstrations are given using a multichannel Aharonov -Bohm interferometer. We propose a new S matrix for multichannel junctions to solve the scattering problem.

Current carried by evanescent modes and possible device application

“…We have studied all these quantum phenomena for a realistic multi-channel ring. Earlier stable quantum switch device was proposed based on evanescent mode conductance and Aharonov-Bohm interferometry 7,35 (see Fig. 4 and Fig.…”

“…In fact this makes analysis much simpler because m 1 stands for angular momentum and takes into account the curvature of the ring. The advantage of this set up is already described by S. Mukherjee et al 35 .…”

“…They are practically impossible to control 10 . This fact changes completely if we use evanescent modes 35 . An electron in an evanescent mode do not acquire phase changes associated with propagation or impurity scattering.…”

“…In our previous work 35 we proposed a junction scattering matrix S for a multi-channel junction that can be easily generalized to any number of channels. One can match the wave functions depicted in Fig.…”