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The experimental proof of its existence in bulk materials remains elusive. In strongly correlated insulators, the proximity of the excitonic insulator phase is reflected by the presence of dispersive electron-hole excitations with a small gap above a singlet ground state. Recently, such an excitation spectrum was proposed to be realized in perovskite oxide LaCoO$_3$. In this Letter we use Co $L_3$-edge resonant inelastic X-ray scattering to put this proposal to experimental test."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004234992250755","@type":"Researcher","foaf:name":[{"@value":"Ru-Pan Wang"}]},{"@id":"https://cir.nii.ac.jp/crid/1420003854341603200","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"90875783"},{"@type":"NRID","@value":"1000090875783"},{"@type":"NRID","@value":"9000299513750"},{"@type":"NRID","@value":"9000410023494"},{"@type":"NRID","@value":"9000241488916"},{"@type":"NRID","@value":"9000415306241"},{"@type":"NRID","@value":"9000413697059"},{"@type":"NRID","@value":"9000401965114"},{"@type":"NRID","@value":"9000401964645"},{"@type":"NRID","@value":"9000241193340"},{"@type":"NRID","@value":"9000401970167"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/atsushihariki"}],"foaf:name":[{"@value":"Atsushi Hariki"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004234992250754","@type":"Researcher","foaf:name":[{"@value":"Andrii Sotnikov"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004234992250752","@type":"Researcher","foaf:name":[{"@value":"Federica Frati"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004234992250757","@type":"Researcher","foaf:name":[{"@value":"Jun Okamoto"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004234992250753","@type":"Researcher","foaf:name":[{"@value":"Hsiao-Yu Huang"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004234992250880","@type":"Researcher","foaf:name":[{"@value":"Amol Singh"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004234992250758","@type":"Researcher","foaf:name":[{"@value":"Di-Jing Huang"}]},{"@id":"https://cir.nii.ac.jp/crid/1030003658804390154","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"20350481"},{"@type":"NRID","@value":"1000020350481"},{"@type":"NRID","@value":"9000006171197"},{"@type":"NRID","@value":"9000388523057"},{"@type":"NRID","@value":"9000401905134"},{"@type":"NRID","@value":"9000401892912"},{"@type":"NRID","@value":"9000025007479"},{"@type":"NRID","@value":"9000003253914"},{"@type":"NRID","@value":"9000398811765"},{"@type":"NRID","@value":"9000024939049"},{"@type":"NRID","@value":"9000402467385"},{"@type":"NRID","@value":"9000018907268"},{"@type":"NRID","@value":"9000239563358"},{"@type":"NRID","@value":"9000398979162"},{"@type":"NRID","@value":"9000019173572"},{"@type":"NRID","@value":"9000284282353"},{"@type":"NRID","@value":"9000388522277"},{"@type":"NRID","@value":"9000346931781"},{"@type":"NRID","@value":"9000401912712"},{"@type":"NRID","@value":"9000299513934"},{"@type":"NRID","@value":"9000346925170"},{"@type":"NRID","@value":"9000401970249"},{"@type":"NRID","@value":"9000388522419"},{"@type":"NRID","@value":"9000401974109"},{"@type":"NRID","@value":"9000401897860"},{"@type":"NRID","@value":"9000398963848"},{"@type":"NRID","@value":"9000398811236"},{"@type":"NRID","@value":"9000415314885"},{"@type":"NRID","@value":"9000018879829"},{"@type":"NRID","@value":"9000401906454"},{"@type":"NRID","@value":"9000398806293"},{"@type":"NRID","@value":"9000398816238"},{"@type":"NRID","@value":"9000401911226"},{"@type":"NRID","@value":"9000258659929"},{"@type":"NRID","@value":"9000322091303"},{"@type":"NRID","@value":"9000401903583"},{"@type":"NRID","@value":"9000398967892"},{"@type":"NRID","@value":"9000367020625"},{"@type":"NRID","@value":"9000237752928"},{"@type":"NRID","@value":"9000314065362"},{"@type":"NRID","@value":"9000398816430"},{"@type":"NRID","@value":"9000412271260"},{"@type":"NRID","@value":"9000401972249"},{"@type":"NRID","@value":"9000332698587"},{"@type":"NRID","@value":"9000376943090"},{"@type":"NRID","@value":"9000258199458"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0097377"}],"foaf:name":[{"@value":"Keisuke Tomiyasu"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004234992250882","@type":"Researcher","foaf:name":[{"@value":"Chao-Hung Du"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004234992250884","@type":"Researcher","foaf:name":[{"@value":"Jan Kuneš"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004234992250885","@type":"Researcher","foaf:name":[{"@value":"Frank M. 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