Authors: Amelin, Kirill
Viirok, Johan
Nagel, Urmas
Rõõm, Toomas
Engelmayer, Johannes
Dey, Tusharkanti
Agung Nugroho, Agustinus
Lorenz, Thomas
Wang, Zhe
Title: Quantum spin dynamics of quasi-one-dimensional Heisenberg-Ising magnets in a transverse field: confined spinons, E8 spectrum, and quantum phase transitions
Language (ISO): en
Abstract: We report on high-resolution terahertz spectroscopic studies of quantum spin dynamics in the quasi-one-dimensional Ising-like ferromagnet CoNb2O6 and antiferromagnet BaCo2V2O8 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, E8 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.
Subject Headings: Confined spinons
Heisenberg-Ising spin chain
Transverse-field Ising-chain quantum critical point
E8 dynamical spectrum
Quantum phase transition
Quantum spin dynamics
Issue Date: 2022-12-07
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Appears in Collections:Fakultät für Physik

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