Giant Anomalous Hall Effect due to Double-Degenerate Quasiflat Bands

نویسندگان

چکیده

We propose a novel approach to achieve giant AHE in materials with flat bands (FBs). FBs are accompanied by small electronic bandwidths, which consequently increases the momentum separation ($K$) within pair of Weyl points and thus integrated Berry curvature. Starting from simple model single nodes, we demonstrated increase $K$ decreasing bandwidth. It is further expanded realistic pyrochlore lattice characteristic double degenerated FBs, where discovered while maximizing nearly vanishing band dispersion FBs. identify that such system can be realized both spinel compounds based on first-principles calculations, validating our theoretical providing feasible platform for experimental exploration.

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ژورنال

عنوان ژورنال: Physical Review Letters

سال: 2021

ISSN: ['1079-7114', '0031-9007', '1092-0145']

DOI: https://doi.org/10.1103/physrevlett.126.106601