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Orbital-selective confinement effect of Ru <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>4</mml:mn><mml:mi>d</mml:mi></mml:math> orbitals in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>SrRuO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math> ultrathin film
The electronic structure of ${\mathrm{SrRuO}}_{3}$ thin film with a thickness from 1 to 50 unit cell (u.c.) is investigated via the resonant inelastic x-ray scattering (RIXS) technique at the O $K$ edge to unravel the intriguing interplay of orbital and charge degrees of freedom. We found that the orbital-selective quantum …