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Resonant inelastic x-ray scattering from electronic excitations in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>α</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>RuCl</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> nanolayers
We present Ru ${L}_{3}$-edge resonant inelastic x-ray scattering (RIXS) measurements of spin-orbit and $d\text{\ensuremath{-}}d$ excitations in exfoliated nanolayers of the Kitaev spin-liquid candidate ${\mathrm{RuCl}}_{3}$. Whereas the spin-orbit excitations are independent of thickness, we observe a pronounced redshift and broadening of the $d\text{\ensuremath{-}}d$ excitations in layers with thicknesses below $\ensuremath{\sim}7$ nm. …