Symmetry Enforced Dirac Points in Antiferromagnetic Semiconductors

Abstract

It is shown that the symmetry enforced Dirac points exist at some time reversal symmetric momenta in antiferroemgnetic compound GdB${}_4$. These Dirac points may be controlled by the external magnetic field or by the deformation of the crystal. Application of the external magnetic field leads to splitting of these points into Weyl points or to opening of a gap depending on the field direction. The application of the symmetry breaking deformation also opens a gap in the spectrum. Suppression of the antiferromagnetic order leads to the formation of the nodal line instead of the Dirac points. This indicates that the symmetry enforced Dirac semimetals may be effectively used in different spintronic devices.

arXiv comment5 pages 2 figures

References in corpus (14)

• Weyl and Dirac Semimetals in Three Dimensional Solids
• Antiferromagnetic spintronics
• Antiferromagnetic spintronics
• Dirac semimetal in three dimensions
• Electrical switching of an antiferromagnet
• Topological classification of crystalline insulators through band structure combinatorics
• Dirac Fermions in Antiferromagnetic Semimetal
• Existence of bulk chiral fermions and crystal symmetry
• Electric control of Dirac quasiparticles by spin-orbit torque in an antiferromagnet
• Filling-enforced Magnetic Dirac Semimetals in Two Dimensions
• Dirac nodal line metal for topological antiferromagnetic spintronics
• Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnetic conductors
• Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnets
• Magnetic quantum oscillations in doped antiferromagnetic insulators