Electrically Tunable Ultraflat Bands and π-Electron Magnetism in Graphene Nanoribbons.

ABSTRACT: Atomically thin crystals hosting flat electronic bands have recently been identified as a rich playground for exploring and engineering strongly correlated phases. Yet, their variety remains limited, primarily to two-dimensional moiré superlattices. Here, we predict the formation of reversible, electrically induced ultraflat bands and π-electron magnetism in one-dimensional chevron graphene nanoribbons. Our ab initio calculations show that the application of a transverse electric field to these nanoribbons generates a pair of isolated, nearly perfectly flat bands with widths of approximately 1 meV around the Fermi level. Upon charge doping, these flat bands undergo a Stoner-like electronic instability, resulting in the spontaneous emergence of local magnetic moments at the edges of

SUBMITTER: Ma R 

PROVIDER: S-EPMC11849038 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature