--- _id: '388' abstract: - lang: eng text: 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. article_processing_charge: No article_type: original author: - first_name: Zhanybek full_name: Alpichshev, Zhanybek id: 45E67A2A-F248-11E8-B48F-1D18A9856A87 last_name: Alpichshev orcid: 0000-0002-7183-5203 - first_name: Fahad full_name: Mahmood, Fahad last_name: Mahmood - first_name: Gang full_name: Cao, Gang last_name: Cao - first_name: Nuh full_name: Gedik, Nuh last_name: Gedik citation: ama: Alpichshev Z, Mahmood F, Cao G, Gedik N. Confinement deconfinement transition as an indication of spin liquid type behavior in Na2IrO3. Physical Review Letters. 2015;114(1). doi:10.1103/PhysRevLett.114.017203 apa: Alpichshev, Z., Mahmood, F., Cao, G., & Gedik, N. (2015). Confinement deconfinement transition as an indication of spin liquid type behavior in Na2IrO3. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.114.017203 chicago: Alpichshev, Zhanybek, Fahad Mahmood, Gang Cao, and Nuh Gedik. “Confinement Deconfinement Transition as an Indication of Spin Liquid Type Behavior in Na2IrO3.” Physical Review Letters. American Physical Society, 2015. https://doi.org/10.1103/PhysRevLett.114.017203. ieee: Z. Alpichshev, F. Mahmood, G. Cao, and N. Gedik, “Confinement deconfinement transition as an indication of spin liquid type behavior in Na2IrO3,” Physical Review Letters, vol. 114, no. 1. American Physical Society, 2015. ista: Alpichshev Z, Mahmood F, Cao G, Gedik N. 2015. Confinement deconfinement transition as an indication of spin liquid type behavior in Na2IrO3. Physical Review Letters. 114(1). mla: Alpichshev, Zhanybek, et al. “Confinement Deconfinement Transition as an Indication of Spin Liquid Type Behavior in Na2IrO3.” Physical Review Letters, vol. 114, no. 1, American Physical Society, 2015, doi:10.1103/PhysRevLett.114.017203. short: Z. Alpichshev, F. Mahmood, G. Cao, N. Gedik, Physical Review Letters 114 (2015). date_created: 2018-12-11T11:46:11Z date_published: 2015-07-07T00:00:00Z date_updated: 2021-01-12T07:52:54Z day: '07' doi: 10.1103/PhysRevLett.114.017203 extern: '1' intvolume: ' 114' issue: '1' language: - iso: eng main_file_link: - open_access: '1' url: https://dspace.mit.edu/handle/1721.1/92979 month: '07' oa: 1 oa_version: Published Version publication: Physical Review Letters publication_status: published publisher: American Physical Society publist_id: '7441' quality_controlled: '1' status: public title: Confinement deconfinement transition as an indication of spin liquid type behavior in Na2IrO3 type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 114 year: '2015' ...