C-BerryTrans: A C++ code for first-principles calculation of Berry-curvature-driven anomalous Hall and Nernst conductivities

We present C-BerryTrans, a C++ code designed for first-principles calculations of Berry-curvature-driven transverse transport properties, namely the anomalous Hall conductivity (AHC) i.e., ${\sigma }_{\mu \nu }^{AHC}$ and anomalous Nernst conductivity (ANC) i.e., ${\alpha }_{\mu \nu }^{ANC}$. The code directly extracts eigenvalues and momentum-matrix elements from WIEN2k calculations and evaluates the Berry curvature ($\mathbf{\Omega }$) using a Kubo-like formalism. For computational efficiency, C-BerryTrans parallelizes $\mathbf{\Omega }$ evaluation over k-points using OpenMP and stores band-resolved curvature in binary format. This design enables rapid post-processing of AHC and ANC over a wide range of temperatures and chemical potentials ($\mu$) in a single run. The code has been benchmarked on well-studied ferromagnetic materials (Fe, Fe${}_3$Ge, Pd, Fe${}_3$Al, and Co${}_2$FeAl). For Fe, the ${\sigma }_{xy}^{AHC}$ is obtained to be $\sim$775 ($\sim$744) $S\mathrm{/}cm$ at 0 (300) K. In case of Fe${}_3$Ge, the calculated value of ${\sigma }_{xy}^{AHC}$ is found to be 311 $S\mathrm{/}cm$ at the room temperature. Nextly, for Co${}_2$FeAl, the magnitude of computed value of ${\sigma }_{xy}^{AHC}$ at 2 K is found to be $\sim$56 $S\mathrm{/}cm$. Next, magnitude of ${\alpha }_{xy}^{ANC}$ for Pd is obtained to be $\sim$0.97 $A{K}^{-1}{m}^{-1}$ at 300 K. For Fe${}_3$Al, the maximum magnitude of ${\alpha }_{xy}^{ANC}$ for $T\le$500 K is computed as $\sim$2.83 $A{K}^{-1}{m}^{-1}$. Lastly, for Co${}_2$FeAl, the value of ${\alpha }_{xy}^{ANC}$ is obtained to be $\sim$0.10 $A{K}^{-1}{m}^{-1}$ at 300 K. These results show good agreement with previously reported data. With its accuracy, scalability, and user-friendly workflow, C-BerryTrans provides a powerful tool for exploring $\mathbf{\Omega }$-driven transport phenomena and is well suited for high-throughput materials discovery.