Novel Topological Weyl Semimetallic Phase in layered materials: Fe₂Sn, Fe₃Sn

Weyl semimetals are the novel topological class of materials having huge applications on quantum computing and spintronics devices. These materials are believed to be the host of the massless but charged quasi particles called Weyl fermions. The Weyl semimetallic phase arise in the crystals when the two non degenerate valance and conduction band touch or cross nearby the Fermi level creating a node called as Weyl node. Here we focus on studying the first principle calculation of the electronic, magnetic and topological properties of the layered material Fe₂Sn and Fe₃Sn using Full Potential Local Orbital Code (FPLO). From our density functional theory calculations, the magnetic ground state is found to be ferromagnetic with a total magnetic moment of 9.12μ_B/unit cell and 14.09 μ_B/unit cell of Fe₂Sn and Fe₃Sn respectively. The electronic state of both shows metallic behavior with the band crossing close to the Fermi level. The systems are predicted to be magnetic WSMs based on the identification of Weyl points close to the Fermi level with chirality 1 or -1. Moreover, the high peak values of anomalous hall conductivity are observed in the energy range of Weyl points.