Anomalous Bloch oscillation and electrical switching of edge magnetization in bilayer graphene nanoribbon

• URL: http://arxiv.org/abs/2202.07979v1
• Date: Wed, 16 Feb 2022 10:42:20 GMT
• Title: Anomalous Bloch oscillation and electrical switching of edge magnetization in bilayer graphene nanoribbon
• Authors: Tixuan Tan, Fengren Fan, Ci Li, and Wang Yao
• Abstract summary: Graphene features topological edge bands that connect the pair of Dirac points through either sectors of the 1D Brillouin zone depending on edge configurations (zigzag or bearded) Because of their flat dispersion, spontaneous edge magnetisation can arise from Coulomb interaction in graphene nanoribbons. We find an anomalous Bloch oscillation in such edge bands, in which the flat dispersion freezes electron motion along the field direction.
• Score: 1.233704313688752
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Graphene features topological edge bands that connect the pair of Dirac points through either sectors of the 1D Brillouin zone depending on edge configurations (zigzag or bearded). Because of their flat dispersion, spontaneous edge magnetisation can arise from Coulomb interaction in graphene nanoribbons, which has caught remarkable interest. We find an anomalous Bloch oscillation in such edge bands, in which the flat dispersion freezes electron motion along the field direction, while the topological connection of the bands through the bulk leads to electron oscillation in the transverse direction between edges of different configurations on opposite sides/layers of a bilayer ribbon. Our Hubbard-model mean-field calculation shows that this phenomenon can be exploited for electrical switching of edge magnetisation configurations.

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