@article{a0c210fddcad4cf58593d205d4ad286a,
title = "Orbital-selective confinement effect of Ru 4d orbitals in SrRuO3 ultrathin film",
abstract = "The electronic structure of SrRuO3 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 confinement effect (QCE) induces the splitting of Ru 4d orbitals. At the same time, we observed a clear suppression of the electron-hole continuum across the metal-to-insulator transition occurring in the 4-u.c. sample. From these two clear observations we conclude that the QCE gives rise to a Mott insulating phase in ultrathin SrRuO3 films. Our interpretation of the RIXS spectra is supported by the configuration interaction calculations of RuO6 clusters.",
author = "Soonmin Kang and Yi Tseng and Kim, {Beom Hyun} and Seokhwan Yun and Byungmin Sohn and Bongju Kim and Daniel McNally and Eugenio Paris and Kim, {Choong H.} and Changyoung Kim and Noh, {Tae Won} and Sumio Ishihara and Thorsten Schmitt and Park, {Je Geun}",
note = "Funding Information: We would like to acknowledge D. Khomskii and B. Kim for helpful discussions. The work at IBS CCES is supported by the Institute of Basic Science (IBS) in Korea (Grants No. IBS-R009-G1, No. IBS-R009-G2, and No. IBS-R009-D1). The work at the Paul Scherrer Institut is supported by the Swiss National Science Foundation through NCCR MARVEL and the Sinergia network Mott Physics Beyond the Heisenberg Model (MPBH). We also thank the Korea Institute for Advanced Study for providing computing resources (KIAS Center for Advanced Computation Linux Cluster System) for this work. Publisher Copyright: {\textcopyright} 2019 American Physical Society.",
year = "2019",
month = jan,
day = "7",
doi = "10.1103/PhysRevB.99.045113",
language = "English",
volume = "99",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "4",
}