At zero temperature the Drude weight is finite along the nodal-line direction at charge neutrality but vanishes quadratically in the transverse direction, while interband conductivity rises linearly with frequency in both directions with direction-dependent slopes.
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Optical conductivity of topological semimetal Nb$_{2n+1}$Si$_n$Te$_{4n+2}$
At zero temperature the Drude weight is finite along the nodal-line direction at charge neutrality but vanishes quadratically in the transverse direction, while interband conductivity rises linearly with frequency in both directions with direction-dependent slopes.