An improved holographic nodal line semimetal

A bstract We study an improved holographic model for the strongly coupled nodal line semimetal which satisfies duality relation between rank two tensor operators $$ \overline{\psi}{\gamma}^{\mu v}\psi ψ ¯ γ μv and v}{\gamma}^5\psi 5 . introduce a Chern-Simons term mass in bulk complex form field is dual to above automatically satisfied from holography. find that there exists quantum phase transition topological trivial phase. In phase, exist multiple lines fermionic spectrum are topologically nontrivial. The geometries different previous without constraint, while resulting properties qualitatively similar those model. This provides more natural ground analyze transports or other of semimetals.