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Spin-orbital entangled molecular jeff states in lacunar spinel compounds

Author

Listed:
  • Heung-Sik Kim

    (Korean Advanced Institute of Science and Technology)

  • Jino Im

    (Northwestern University)

  • Myung Joon Han

    (Korean Advanced Institute of Science and Technology
    KAIST Institute for the NanoCentury, Korean Advanced Institute of Science and Technology)

  • Hosub Jin

    (Center for Correlated Electron Systems, Institute for Basic Science (IBS)
    Seoul National University)

Abstract

The entanglement of the spin and orbital degrees of freedom through the spin-orbit coupling has been actively studied in condensed matter physics. In several iridium oxide systems, the spin-orbital entangled state, identified by the effective angular momentum jeff, can host novel quantum phases. Here we show that a series of lacunar spinel compounds, GaM4X8 (M=Nb, Mo, Ta and W and X=S, Se and Te), gives rise to a molecular jeff state as a new spin-orbital composite on which the low-energy effective Hamiltonian is based. A wide range of electron correlations is accessible by tuning the bandwidth under external and/or chemical pressure, enabling us to investigate the cooperation between spin-orbit coupling and electron correlations. As illustrative examples, a two-dimensional topological insulating phase and an anisotropic spin Hamiltonian are investigated in the weak and strong coupling regimes, respectively. Our finding can provide an ideal platform for exploring jeff physics and the resulting emergent phenomena.

Suggested Citation

  • Heung-Sik Kim & Jino Im & Myung Joon Han & Hosub Jin, 2014. "Spin-orbital entangled molecular jeff states in lacunar spinel compounds," Nature Communications, Nature, vol. 5(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4988
    DOI: 10.1038/ncomms4988
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    Cited by:

    1. Thorben Petersen & Pritam Bhattacharyya & Ulrich K. Rößler & Liviu Hozoi, 2023. "Resonating holes vs molecular spin-orbit coupled states in group-5 lacunar spinels," Nature Communications, Nature, vol. 14(1), pages 1-5, December.

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