The effects of strain on the topology of EuCd₂As₂

EuCd₂As₂ is well known for its Dirac point (DP) close to the Fermi surface. Consequently, there has been a lot of research regarding the splitting of this DP into a single pair of Weyl points (WP) mostly in the antiferromagnetic (AFM) order. Recently, there has been evidence for possible paramagnetic states with ferromagnetic (FM) spin fluctuations. Furthermore, the effects of strain on this structure remained open. Using ab-initio DFT calculations, we show the effects of strain on the AFM and FM ordered EuCd₂As₂. The non-strained structure shows a DP close to the Fermi surface protected by C₃ symmetry. Applying strain to this compound while preserving this symmetry, allows for shifting the DP along the k_z axis. By the analysis with a low-energy effective Hamiltonian, we calculate the topological properties as a function of strain.