Interface tool from Wannier90 to RESPACK: wan2respack

We develop the interface tool $\mathtt{\text{wan2respack}}$, which connects $\mathtt{\text{RESPACK}}$ (software that derives the low-energy effective Hamiltonians of solids) with $\mathtt{\text{Wannier90}}$ (software that constructs Wannier functions). $\mathtt{\text{wan2respack}}$ converts the Wannier functions obtained by $\mathtt{\text{Wannier90}}$ into those used in $\mathtt{\text{RESPACK}}$, which is then used to derive the low-energy effective Hamiltonians of solids. In this paper, we explain the basic usage of $\mathtt{\text{wan2respack}}$ and show its application to standard compounds of correlated materials, namely, the correlated metal SrVO${}_3$ and the high-$T_c$ superconductor La${}_2$CuO${}_4$. Furthermore, we compare the low-energy effective Hamiltonians of these compounds using Wannier functions obtained by $\mathtt{\text{Wannier90}}$ and those obtained by $\mathtt{\text{RESPACK}}$. We confirm that both types of Wannier functions give the same Hamiltonians. This benchmark comparison demonstrates that $\mathtt{\text{wan2respack}}$ correctly converts Wannier functions in the $\mathtt{\text{Wannier90}}$ format into those in the $\mathtt{\text{RESPACK}}$ format.