The interplay between real and pseudo magnetic field in graphene with strain

TL;DR

This paper explores how strain-induced pseudo magnetic fields in graphene interact with real magnetic fields, affecting its electronic properties, orbital magnetism, and quantum confinement, revealing complex magnetic behaviors.

Contribution

It introduces a detailed analysis of the interplay between real and pseudo magnetic fields in strained graphene, highlighting their effects on quantum dot formation and magnetic responses.

Findings

Pseudo magnetic fields create confined quantum dots in graphene.

Orbital magnetic response can switch between diamagnetic and paramagnetic.

Interplay of real and pseudo fields influences degeneracy and channel opening.

Abstract

We investigate electric and magnetic properties of graphene with rotationally symmetric strain. The strain generates large pseudo magnetic field with alternating sign in space, which forms a strongly confined quantum dot connected to six chiral channels. The orbital magnetism, degeneracy, and channel opening can be understood from the interplay between real and pseudo magnetic field which have different parities under time reversal and mirror reflection. While the orbital magnetic response of the confined state is diamagnetic, it can be paramagnetic if there is an accidental degeneracy with opposite mirror reflection parity.