Amelin, KirillViirok, JohanNagel, UrmasRõõm, ToomasEngelmayer, JohannesDey, TusharkantiAgung Nugroho, AgustinusLorenz, ThomasWang, Zhe2023-02-172023-02-172022-12-07http://hdl.handle.net/2003/41252http://dx.doi.org/10.17877/DE290R-23093We 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.enConfined spinonsHeisenberg-Ising spin chainTransverse-field Ising-chain quantum critical pointE8 dynamical spectrumQuantum phase transitionQuantum spin dynamics530Text