The anomalous antiferromagnetic topological phase in pressurized SmB6

Abstract

Antiferromagnetic materials, whose time-reversal symmetry is broken, can be classified into the Z2 topology if they respect some specific symmetry. Since the theoretical proposal, however, no materials have been found to host the antiferromagnetic topological (AFT) phase to date. Here, for the first time, we demonstrate that the topological Kondo insulator SmB6 can be an AFT system when pressurized to undergo an antiferromagnetic phase transition. In addition to propose the possible candidate for an AFT material, in this work we also illustrate the anomalous topological surface states of the AFT phase which has not been discussed before. Originating from the interplay between the topological properties and the antiferromagnetic surface magnetization, the topological surface states of the AFT phase behave differently as compared with those of a topological insulator. Besides, the AFT insulators are also found promising in the generation of tunable spin currents, which is an important application in spintronics.

References in corpus (11)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
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• Antiferromagnetic topological insulators
• Correlated Topological Insulators with Mixed Valence
• Direct observation of the spin texture in strongly correlated SmB6 as evidence of the topological Kondo insulator
• Quantum Hall effect in a bulk antiferromagnet EuMnBi${}_2$ with magnetically confined two-dimensional Dirac fermions
• Kondo Breakdown in Topological Kondo Insulators
• Antiferromagnetic Dirac Semimetals in Two Dimensions
• Two distinct topological phases in the mixed valence compound YbB6 and its differences from SmB6
• Suppression of magnetic excitations near the surface of the topological Kondo insulator SmB6

Cited by in corpus (10)

• Unusual change in the Dirac-cone energy band upon two-step magnetic transition in CeBi
• Magnetic states in a three-dimensional topological Kondo insulator
• Topology and Magnetism in the Kondo Insulator Phase Diagram
• ${\mathcal{Z}}_2$ classification for a novel antiferromagnetic topological insulating phase in three-dimensional topological Kondo insulator
• Magnetic and topological transitions in three-dimensional topological Kondo insulator
• Importance of orbital fluctuations for the magnetic dynamics in heavy-fermion compound SmB${}_6$
• Correlation Induced Magnetic Topological Phases in Mixed-Valence Compound SmB6
• Topological Aspects of Antiferromagnets
• Valence transition in topological Kondo insulator
• Reflection-Symmetry Protected Antiferromagnetic Topological Insulator in Three-Dimensional Heavy-Fermion Systems