An explicit infinite family of biregular graphs is shown to have (3/5 - epsilon)-two-sided unique-neighbor expansion, the first to beat the spectral 0.5d barrier.
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Explicit Two-Sided Vertex Expanders Beyond the Spectral Barrier
An explicit infinite family of biregular graphs is shown to have (3/5 - epsilon)-two-sided unique-neighbor expansion, the first to beat the spectral 0.5d barrier.