Spin-orbital entangled molecular j(eff) states in lacunar spinel compounds

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Title
Spin-orbital entangled molecular j(eff) states in lacunar spinel compounds
Author(s)
Heung-Sik Kim; Jino Im; Myung Joon Han; Hosub Jin
Publication Date
2014-06
Journal
NATURE COMMUNICATIONS, v.5, no., pp.3988 -
Publisher
NATURE PUBLISHING GROUP
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, GaM 4 X 8 (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. © 2014 Macmillan Publishers Limited. All rights reserved.
URI
https://pr.ibs.re.kr/handle/8788114/1012
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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