Bending nanoribbon to induce large anisotropic magnetoconductance

TL;DR

This paper theoretically demonstrates that bending nanoribbons can induce large, tunable anisotropic magnetoconductance, with potential for practical applications across various 2D systems.

Contribution

It introduces a novel geometry-induced magnetoconductance effect in bent nanoribbons, enabling large, tunable anisotropic responses.

Findings

Magnetoconductance up to 100% in bent nanoribbons.

Further enhancement of GAMC to over 300% via bending.

Effect remains stable across Fermi energies, magnetic fields, and temperatures.

Abstract

When a nanoribbon is bent under a homogeneous external magnetic field, the effective magnetic field inside becomes either homogeneous or inhomogeneous, depending on the direction of the field. This enables the selective creation of bulk, interface, and edge magnetic states in the bent structure, for a magnetic field with a strength. We establish theoretically that these tuneable states lead to a strong geometry-induced anisotropic magnetoconductance (GAMC) in perpendicularly bent nanoribbon, which can reach up to 100\%. Moreover, the GAMC can be further enhanced to 200\%, 300\%, or even higher by either further bending or tuning the bending angle. The potential of this phenomenon for practical applications is demonstrated by its stable anisotropy, which remains consistent across a wide range of Fermi energies, can be observed even at weak magnetic fields and room temperature, and occurs in various systems such as two-dimensional electron gas (2DEG) and graphene.