A chemical-potential-dependent interband polarizability term, scaling as q_z q^2 and resonating near the band edge, is derived for three-dimensional Dirac nodal line semimetals within the random phase approximation.
On further expanding cos(A+h) for smallhwhereA=δθ mn k andh= P γ qγ ∂γθm k + P α,β 1 2 qαqβ ∂αβθm k +O(q 3) yields cos(A+h) = cosA−hsinA− h2 2 cosA+ h3 6 sinA+· · ·
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Unveiling Novel Resonant Interband Contribution to Polarizability in three-dimensional systems
A chemical-potential-dependent interband polarizability term, scaling as q_z q^2 and resonating near the band edge, is derived for three-dimensional Dirac nodal line semimetals within the random phase approximation.