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Jin, Hosub
Quantum Materials Design Lab
Research Interests
  • Spin-orbit coupling, electron-correlation, topological quantum phases

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Strain-induced topological insulator phase and effective magnetic interactions in Li2IrO3

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Title
Strain-induced topological insulator phase and effective magnetic interactions in Li2IrO3
Author
Kim, Heung-SikKim, Choong HJeong, HogyunJin, HosubYu, Jaejun
Issue Date
2013-04
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.87, no., pp.165117 -
Abstract
We present an effective tight-binding Hamiltonian for Li2IrO3 based on maximally localized Wannier functions for states near the Fermi level as obtained from first-principles electronic structure calculations. The majority of the Wannier orbitals are positioned on the center site with dominant j(eff) = 1/2 character, while relatively small j(eff) = 3/2 tails lie on the three nearest-neighbor sites. Interestingly, the spin quantization axis of the j(eff) = 1/2 components deviates from the local octahedral axis and points toward the nearest-neighbor Ir direction. In our tight-binding model, there are relatively strong next-nearest- and the third-nearest-neighbor hopping terms within the two-dimensional Ir honeycomb lattice in addition to the relatively small but significant interlayer hopping terms. The ratio between the nearest-neighbor and the third-nearest-neighbor hoppings, which can be controlled by the lattice strain, plays a critical role in determinating the Z(2)-invariant character of Li2IrO3. From our tight-binding model, we also derive an effective Hamiltonian and its parameters for the magnetic exchange interactions. Due to the complex spin-dependent next-nearest-neighbor hopping terms, our pseudospin Hamiltonian includes significant next-nearest-neighbor antiferromagnetic Kitaev terms as well as Dzyaloshinskii-Moriya and Heisenberg interactions. From our model Hamiltonian we estimate classical energies of collinear magnetic configurations as functions of the Hund's coupling of the Ir atom, from which zigzag-type magnetic order gives the lowest energy. DOI: 10.1103/PhysRevB.87.165117
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DOI
10.1103/PhysRevB.87.165117
ISSN
2469-9950
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PHY_Journal Papers
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