Novel Magnetic Weyl Semimetallic State in Layered Material: Fe₂Sn

Weyl Semimetals (WSMs) are the crystalline substances that are believed to be the sources for massless but charged particle called Weyl fermions. They are found to possess exotic properties such as high mobilities, magneto transport phenomenon, large magneto resistance and quantum hall phenomenon. These properties are expected to be highly applicable for high speed electronics and spintronics, quantum computing, hall effect devices and even in the catalysis. Here we focus on studying the electronic, magnetic and transport properties of hexagonal Fe₂Sn. From our density functional theory calculations, the magnetic ground state is found to be ferromagnetic with a total magnetic moment of 4.56μ_B/formula unit. The electronic state shows metallic behavior with the band crossing close to the Fermi level. Fe₂Sn is predicted to be magnetic WSM based on the identification of 16 Weyl points within an 0.01 eV around the Fermi level with chirality .