Abstract
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 9.12μB/unit cell and 14.09 μB/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.
Highlights
Introduction and MotivationEnergyTopological Insulator Conduction band Fermi level Surface statesValence band MomentumHasan et al.,RMP,82, 3045(2010)Topological MaterialsTopological Semimetals Kondo InsulatorTopological Superconductors
➢ Weyl semimetals (WSMs) are the crystalline substances which are the sources for the Weyl fermions
➢ Breaking of TRS or IS or both results crossing of valance and conduction band creating Weyl node
Summary
Introduction and MotivationEnergyTopological Insulator Conduction band Fermi level Surface statesValence band MomentumHasan et al.,RMP,82, 3045(2010)Topological MaterialsTopological Semimetals Kondo InsulatorTopological Superconductors. ➢ Conduction through bulk : Loss of huge amount energy in the form of heat ➢ Conduction through surfaces preserves huge amount of heat loss ➢ The solution gives four folded Dirac Points. ➢ Dirac Points: Sources for Dirac Fermions ➢ Weyl solved the Dirac equation setting the mass to zero.
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