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Phys. Rev. Lett. 102, 256403 (2009) [4 pages]

Quantum Spin Hall Effect in a Transition Metal Oxide Na2IrO3

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Atsuo Shitade1,*, Hosho Katsura2, Jan Kuneš3,4, Xiao-Liang Qi5, Shou-Cheng Zhang5, and Naoto Nagaosa1,2
1Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2Cross-Correlated Materials Research Group (CMRG), ASI, RIKEN, Wako 351-0198, Japan
3Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Augsburg 86135, Germany
4Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 53 Praha, Czech Republic
5Department of Physics, McCullough Building, Stanford University, Stanford, California 94305-4045, USA

Received 8 September 2008; published 24 June 2009

We study theoretically the electronic states in a 5d transition metal oxide Na2IrO3, in which both the spin-orbit interaction and the electron correlation play crucial roles. A tight-binding model analysis together with the first-principles band structure calculation predicts that this material is a layered quantum spin Hall system. Because of the electron correlation, an antiferromagnetic order first develops at the edge, and later inside the bulk at low temperatures.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.256403
DOI:
10.1103/PhysRevLett.102.256403
PACS:
71.70.Ej, 75.30.Kz, 75.80.+q, 77.80.−e

*shitade@appi.t.u-tokyo.ac.jp

 
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