Spinons and damped phonons in spin-1/2 quantum-liquid Ba\(_{4}\)Ir\({}_3\)O\({}_{10}\) observed by Raman scattering

In spin-1/2 Mott insulators, non-magnetic quantum liquid phases are often argued to arise when the system shows no magnetic ordering, but identifying positive signatures of these phases or related spinon quasiparticles can be elusive. Here we use Raman scattering to provide three signatures for spin...

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Bibliographic Details
Published in:arXiv.org 2021-10
Main Authors: Sokolik, Aaron, Hakani, Sami, Roy, Susmita, Pellatz, Nicholas, Zhao, Hengdi, Cao, Gang, Kimchi, Itamar, Reznik, Dmitry
Format: Article
Language:English
Subjects:
Barium
Conductors
Damping
Electron transport
Elementary excitations
Helium
Insulators
Liquid phases
Phonons
Raman spectra
Signatures
Spin-orbit interactions
Strontium
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Summary:In spin-1/2 Mott insulators, non-magnetic quantum liquid phases are often argued to arise when the system shows no magnetic ordering, but identifying positive signatures of these phases or related spinon quasiparticles can be elusive. Here we use Raman scattering to provide three signatures for spinons in a possible spin-orbit quantum liquid material Ba\({}_4\)Ir\({}_3\)O\({}_{10}\): (1) A broad hump, which we show can arise from Luttinger Liquid spinons in Raman with parallel photon polarizations normal to 1D chains; (2) Strong phonon damping from phonon-spin coupling via the spin-orbit interaction; and (3) the absence of (1) and (2) in the magnetically ordered phase that is produced when 2% of Ba is substituted by Sr ((Ba\({}_{0.98}\)Sr\({}_{0.02}\))\({}_4\)Ir\({}_3\)O\({}_{10}\)). The phonon damping via itinerant spinons seen in this quantum-liquid insulator suggests a new mechanism for enhancing thermoelectricity in strongly correlated conductors, through a neutral quantum liquid that need not affect electronic transport.
ISSN:2331-8422
DOI:10.48550/arxiv.2110.15916