Current carried by evanescent modes and possible device application

TL;DR

This paper investigates electronic currents in evanescent modes within a quantum Aharonov-Bohm ring, proposing a formalism for current calculation and exploring device stability and current magnification effects.

Contribution

It introduces a formalism for calculating currents in evanescent states in a multichannel ring and demonstrates the stability of conductance against material variations.

Findings

Currents in evanescent modes are less sensitive to material parameters.

The system can be used to develop stable quantum devices based on magnetic and transport properties.

Current magnification occurs even with evanescent states.

Abstract

Quantum tunneling of an electron through a classically forbidden regime has no classical analogue and several aspects of it are still not well understood. In this work we analyze electronic currents under the barrier. For this we consider a multichannel Aharonov-Bohm ring and developed a correct formalism to calculate the currents inside the ring when the states are evanescent. We also show unlike other proposed quantum devices that such currents and associated conductance are not very sensitive to changes in material parameters and thus the system can be used to build stable devices that work on magnetic and transport properties. We also study the current magnification property of the ring in presence of both propagating and evanescent states.