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Effect of spin-orbit coupling on the effective-spin correlation in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>YbMgGaO</mml:mi></mml:mrow><mml:mn>4</mml:mn></mml:msub></mml:math>
Motivated by the recent experiments on the triangular lattice spin-liquid candidate ${\mathrm{YbMgGaO}}_{4}$, we explore the effect of spin-orbit coupling on the effective-spin correlation of the Yb local moments. We point out that the anisotropic interaction between the effective spins on the nearest-neighbor bonds is sufficient to reproduce the spin-wave dispersion …