Journal
PHYSICAL REVIEW B
Volume 84, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.201104
Keywords
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Funding
- US Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
- [DOE-DE-SC0002554]
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We use the variational mean-field approach to systematically study the phase diagram of a bilayer heterostructure of the correlated transition-metal oxide LaNiO3, grown along the (111) direction. The Ni3+ ions with a d(7) (or e(g)(1)) configuration form a buckled honeycomb lattice. We show that, as a function of the strength of the on-site interactions, various topological phases emerge. In the presence of a reasonable size of the Hund's coupling, as the correlation is tuned from intermediate to strong, the following sequence of phases is found: (1) a Dirac half-semimetal phase, (2) a quantum anomalous Hall insulator (QAHI) phase with Chern number one, and (3) a ferromagnetic nematic phase breaking the lattice point-group symmetry. The spin-orbit couplings and magnetism are both dynamically generated in the QAHI phase.
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