Lorentz force effects for graphene Aharonov-Bohm interferometers

TL;DR

This paper studies how magnetic fields influence electron currents in graphene Aharonov-Bohm interferometers, revealing effects on conductance related to quasibound states, device orientation, and intervalley scattering.

Contribution

It provides new insights into magnetic deflection effects on conductance and quasibound states in graphene interferometers, considering device geometry and scattering phenomena.

Findings

Conductance oscillations depend on quasibound state properties.

High magnetic fields induce high harmonics in conductance.

Intervalley scattering influences interference patterns.

Abstract

We investigate magnetic deflection of currents that flow across the Aharonov-Bohm interferom- eters defined in graphene. We consider devices induced by closed n-p junctions in nanoribbons as well as etched quantum rings. The deflection effects on conductance are strictly correlated with the properties of the ring-localized quasibound states. The energy of these states, their lifetime and the periodicity of the conductance oscillations are determined by orientation of the current circulating within the interferometer. Formation of high harmonics of conductance at high magnetic field and the role of intervalley scattering are discussed.