Zigzag nanoribbon of gated bilayer hexagonal crystals with spontaneous edge magnetism

TL;DR

This paper investigates the edge magnetism and electronic properties of zigzag nanoribbons in bilayer hexagonal crystals, demonstrating gate-tunable spin-polarized phases with potential spintronic applications.

Contribution

It provides a detailed analysis of how gating influences magnetic and electronic states in bilayer nanoribbons, extending understanding beyond monolayer systems.

Findings

Gated voltage controls magnetic and electronic configurations.

Spin-up and spin-down band gaps can be independently opened or closed.

Identifies potential for gate-tunable spintronic devices.

Abstract

Zigzag nanoribbons of monolayer graphene-like two-dimensional materials host spontaneous edge magnetism at the zigzag terminations, whose configuration controls the band gap. In this article, the edge magnetism of zigzag nanoribbons of bilayer hexagonal crystals are studied. The specific models of bilayer graphene and bilayer silicene are both studied. As the gated voltage increases, the total energy level, magnetic structure and band structures of the ground state and the first quasi-stable excited state are tuned. For certain region of the gated voltage, the band gaps of spin up and down are opened and closed, respectively, so that the systems are in the spin-polarized metallic phase. The spin-polarized conducting edge band of the bilayer nanoribbons could be applied for gate tunable spintronic devices.