Journal
PHYSICAL REVIEW B
Volume 81, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.245209
Keywords
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Funding
- NSF [DMR-0804413]
- WIN
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We consider antiferromagnets breaking both time-reversal (Theta) and a primitive-lattice translational symmetry (T-1/2) of a crystal but preserving the combination S=Theta T-1/2. The S symmetry leads to a Z(2) topological classification of insulators, separating the ordinary insulator phase from the antiferromagnetic topological insulator phase. This state is similar to the strong topological insulator with time-reversal symmetry and shares with it such properties as a quantized magnetoelectric effect. However, for certain surfaces the surface states are intrinsically gapped with a half-quantum Hall effect [sigma(xy)=e(2)/(2h)], which may aid experimental confirmation of theta=pi quantized magnetoelectric coupling. Step edges on such a surface support gapless, chiral quantum wires. In closing we discuss GdBiPt as a possible example of this topological class.
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