Quantum transport in a multi-path graphene Aharonov-Bohm inteferometer

TL;DR

This study explores quantum electron transport in a multi-path graphene Aharonov-Bohm interferometer, revealing complex oscillations, transport blockade phenomena, and implications for quantum sensing applications.

Contribution

It provides new insights into multi-path quantum interference effects in graphene nanoribbons and their dependence on magnetic field and edge effects.

Findings

Complex oscillatory conductance at low magnetic fields.

Transport blockade in certain nanoribbons at higher fields.

Potential applications in quantum interferometry and sensing.

Abstract

We investigate the quantum transport dynamics of electrons in a multi-path Aharonov-Bohm interferometer comprising several parallel graphene nanoribbons. At low magnetic field strengths, the conductance displays a complex oscillatory behavior stemming from the interference of electron wave functions from different paths, reminiscent of the diffraction grating in optics. With increasing magnetic field strength, certain nanoribbons experience transport blockade, leading to conventional Aharonov-Bohm oscillations arising from two-path interference. We also discuss the impact of edge effects and the influence of finite temperature. Our findings offer valuable insights for experimental investigations of quantum transport in multi-path devices and their potential application for interferometry and quantum sensing.