In gapped solids, band extrema are analytic at non-degenerate points for DFT and G0W0, validating the effective mass approximation, with symmetry determining the allowed mass tensor forms for all 32 point groups.
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Analyticity and symmetry of band extrema in gapped solids: when does the effective mass approximation hold?
In gapped solids, band extrema are analytic at non-degenerate points for DFT and G0W0, validating the effective mass approximation, with symmetry determining the allowed mass tensor forms for all 32 point groups.