Topological Magnetic Insulators with Corundum Structure

Details Topological Magnetic Insulators with Corundum Structure Topological Magnetic Insulators with Corundum Structure

2010-08-16

arxiv.org/abs/1008.2666v1

Phys. Rev. Lett. 106, 126403 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4.6 pages, 4 figures

Scientific paper

Topological insulators are new states of quantum matter in which surface states residing in the bulk insulating gap are protected by time-reversal symmetry. When a proper kind of antiferromagnetic long range order is established in a topological insulator, the system supports axionic excitations. In this paper, we study theoretically the electronic states in a transition metal oxide of corundum structure, in which both spin-orbit interaction and electron-electron interaction play crucial roles. A tight-binding model analysis predicts that materials with this structure can be strong topological insulator. Because of the electron correlation, an antiferromagnetic order may develop, giving rise to a topological magnetic insulator phase with axionic excitations.

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