Quantum spin dynamics of quasi-one-dimensional Heisenberg-Ising magnets in a transverse field: confined spinons, E 8 spectrum, and quantum phase transitions

Abstract We report on high-resolution terahertz spectroscopic studies of quantum spin dynamics in the quasi-one-dimensional Ising-like ferromagnet CoNb 2 O 6 and antiferromagnet BaCo 2 V 2 O 8 as a function of an applied transverse magnetic field. In the ordered phases stabilized by inter-chain coup...

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Published inJournal of physics. A, Mathematical and theoretical Vol. 55; no. 48; pp. 484005 - 484019
Main Authors Amelin, Kirill, Viirok, Johan, Nagel, Urmas, Rõõm, Toomas, Engelmayer, Johannes, Dey, Tusharkanti, Agung Nugroho, Agustinus, Lorenz, Thomas, Wang, Zhe
Format Journal Article
LanguageEnglish
Published IOP Publishing 02.12.2022
Subjects
confined spinons
dynamical spectrum
Heisenberg-Ising spin chain
quantum phase transition
quantum spin dynamics
transverse-field Ising-chain quantum critical point
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Summary:Abstract We report on high-resolution terahertz spectroscopic studies of quantum spin dynamics in the quasi-one-dimensional Ising-like ferromagnet CoNb 2 O 6 and antiferromagnet BaCo 2 V 2 O 8 as a function of an applied transverse magnetic field. In the ordered phases stabilized by inter-chain couplings, we reveal characteristics for confined spinon excitations, E 8 dynamical spectrum, and field-induced quantum phase transitions. The connections between these characteristic dynamical features are found in the field-dependent evolution of the excitation spectra.
Bibliography:JPhysA-118054.R2
ISSN:1751-8113
1751-8121
DOI:10.1088/1751-8121/aca6b8