title: Topological quantum phase transition in 5d transition metal oxide Na2IrO3.
abstract: We predict a quantum phase transition from normal to topological insulators in the 5d transition metal oxide Na2IrO3, 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 Na2IrO3 model structures show that the interlayer distance can be an important parameter for the existence of a three-dimensional strong topological insulator phase. Na2IrO3 is suggested to be a candidate material which can have both a nontrivial topology of bands and strong electron correlations.
authors.affiliation: Department of Physics and Astronomy and Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-747, Korea.
authors.forename: Choong H
authors.initials: CH
authors.lastname: Kim
authors.forename: Heung Sik
authors.initials: HS
authors.lastname: Kim
authors.forename: Hogyun
authors.initials: H
authors.lastname: Jeong
authors.forename: Hosub
authors.initials: H
authors.lastname: Jin
authors.forename: Jaejun
authors.initials: J
authors.lastname: Yu