Topological Quantum Phase Transition in 5$d$ Transition Metal Oxide Na$_2$IrO$_3$

Details Topological Quantum Phase Transition in 5$d$ Transition Metal Oxide Na$_2$IrO$_3$ Topological Quantum Phase Transition in 5$d$ Transition Metal Oxide Na$_2$IrO$_3$

2012-01-28

arxiv.org/abs/1201.5929v2

Phys. Rev. Lett. 108, 106401 (2012)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.108.106401

We predict a quantum phase transition from normal to topological insulators in the 5$d$ transition metal oxide Na$_2$IrO$_3$, where the transition can be driven by the change of the long-range hopping and trigonal crystal field terms. From the first-principles-derived tight-binding Hamiltonian we determine the phase boundary through the parity analysis. In addition, our first-principles calculations for Na$_2$IrO$_3$ model structures show that the interlayer distance can be an important parameter for the existence of a three-dimensional strong topological insulator phase. Na$_2$IrO$_3$ is suggested to be a candidate material which can have both a nontrivial topology of bands and strong electron correlations.

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