期刊
PHYSICAL REVIEW B
卷 91, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.241110
关键词
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资金
- NSERC of Canada
- Center for Quantum Materials at the University of Toronto
- Canada Foundation for Innovation under the auspices of Compute Canada
- Government of Ontario
- Ontario Research Fund for Research Excellence
- University of Toronto
- NSERC-CREATE for a graduate fellowship through the HEATER program
Intensive studies of the interplay between spin-orbit coupling (SOC) and electronic correlations in transition-metal compounds have recently been undertaken. In particular, j(eff) = 1/2 bands on a honeycomb lattice provide a pathway to realize Kitaev's exactly solvable spin model. However, since current wisdom requires strong atomic SOC to make j(eff) = 1/2 bands, studies have been limited to iridium oxides. Contrary to this expectation, we demonstrate how Kitaev interactions arise in 4d-orbital honeycomb alpha-RuCl3, despite having significantly weaker SOC than the iridium oxides, via assistance from electron correlations. A strong-coupling spin model for these correlation-assisted j(eff) = 1/2 bands is derived, in which large antiferromagnetic Kitaev interactions emerge along with ferromagnetic Heisenberg interactions. Our analyses suggest that the ground state is a zigzag-ordered phase lying close to the antiferromagnetic Kitaev spin liquid. Experimental implications for angle-resolved photoemission spectroscopy, neutron scattering, and optical conductivities are discussed.
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