--- res: bibo_abstract: - We use ultrafast optical spectroscopy to observe binding of charged single-particle excitations (SE) in the magnetically frustrated Mott insulator Na2IrO3. Above the antiferromagnetic ordering temperature (TN) the system response is due to both Hubbard excitons (HE) and their constituent unpaired SE. The SE response becomes strongly suppressed immediately below TN. We argue that this increase in binding energy is due to a unique interplay between the frustrated Kitaev and the weak Heisenberg-type ordering term in the Hamiltonian, mediating an effective interaction between the spin-singlet SE. This interaction grows with distance causing the SE to become trapped in the HE, similar to quark confinement inside hadrons. This binding of charged particles, induced by magnetic ordering, is a result of a confinement-deconfinement transition of spin excitations. This observation provides evidence for spin liquid type behavior which is expected in Na2IrO3.@eng bibo_authorlist: - foaf_Person: foaf_givenName: Zhanybek foaf_name: Alpichshev, Zhanybek foaf_surname: Alpichshev foaf_workInfoHomepage: http://www.librecat.org/personId=45E67A2A-F248-11E8-B48F-1D18A9856A87 orcid: 0000-0002-7183-5203 - foaf_Person: foaf_givenName: Fahad foaf_name: Mahmood, Fahad foaf_surname: Mahmood - foaf_Person: foaf_givenName: Gang foaf_name: Cao, Gang foaf_surname: Cao - foaf_Person: foaf_givenName: Nuh foaf_name: Gedik, Nuh foaf_surname: Gedik bibo_doi: 10.1103/PhysRevLett.114.017203 bibo_issue: '1' bibo_volume: 114 dct_date: 2015^xs_gYear dct_language: eng dct_publisher: American Physical Society@ dct_title: Confinement deconfinement transition as an indication of spin liquid type behavior in Na2IrO3@ ...