# Aharonov-Bohm effect in monolayer black phosphorus (phosphorene) nanorings

## TL;DR

This paper theoretically demonstrates the Aharonov-Bohm effect in monolayer phosphorene nanorings, revealing giant magnetoresistance and conductance oscillations modulated by magnetic fields and anisotropy, even at room temperature.

## Contribution

It provides the first atomistic simulation analysis of AB effect and giant MR in phosphorene nanorings, highlighting anisotropic conductance and thermal stability.

## Key findings

- Conductance oscillates periodically with magnetic field due to AB effect.
- Giant magnetoresistance up to 2000% observed in zigzag PNR.
- MR remains significant at room temperature despite thermal effects.

## Abstract

This work presents theoretical demonstration of Aharonov-Bohm (AB) effect in monolayer phosphorene nanorings (PNR). Atomistic quantum transport simulations of PNR are employed to investigate the impact of multiple modulation sources on the sample conductance. In presence of a perpendicular magnetic field, we find that the conductance of both armchair and zigzag PNR oscillate periodically in a low-energy window as a manifestation of the AB effect. Our numerical results have revealed a giant magnetoresistance (MR) in zigzag PNR (with a maximum magnitude approaching two thousand percent). It is attributed to the AB effect induced destructive interference phase in a wide energy range below the bottom of the second subband. We also demonstrate that PNR conductance is highly anisotropic, offering an additional way to modulate MR. The giant MR in PNR is maintained at room temperature in the presence of thermal broadening effect.