Asymmetric coherent transmission for single particle diode and gyroscope

TL;DR

This paper demonstrates that a three-site quantum system can function as a diode and gyroscope by exploiting asymmetric scattering properties, with potential applications in quantum devices and rotation sensing.

Contribution

It introduces a novel three-site system exhibiting asymmetric scattering, enabling diode-like current flow and gyroscopic rotation measurement within a unified quantum framework.

Findings

Three-site system acts as a perfect diode under certain conditions.

Current difference linearly depends on rotational angular velocity.

Asymmetric scattering is analytically characterized using Bethe Ansatz and Green's function.

Abstract

We study the single particle scattering process in a coherent multi-site system consisting of a tight-binding ring threaded by an Aharonov-Bohm flux and several attaching leads. The asymmetric behavior of scattering matrix is discovered analytically in the framework of both Bethe Ansatz and Green's function formalism. It is found that, under certain conditions, a three-site electronic system can behave analogous to a perfect semiconductor diode where current flows only in one direction. The general result is also valid for a neutral particle system since the effective magnetic flux may be implemented by a globe rotation. This observation means that the three-site system can serve as an orientation measuring gyroscope due to the approximate linear dependence of the current difference of two output leads on the rotational angular velocity.