Confinement deconfinement transition as an indication of spin liquid type behavior in Na2IrO3 Journal Article


Author(s): Alpichshe, Zhanybek; Mahmood, Fahad; Cao, Gang; Gedik, Nuh
Article Title: Confinement deconfinement transition as an indication of spin liquid type behavior in Na2IrO3
Affiliation
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.
Keywords: Binding energy, Charged particles, Elementary particles, Liquids, Antiferromagnetism
Journal Title: Physical Review Letters
Volume: 114
Issue 1
ISSN: 1079-7114
Publisher: American Physical Society  
Date Published: 2015-07-07
Start Page: Article number: 017203
URL:
DOI: 10.1103/PhysRevLett.114.017203
Open access: yes (repository)
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