TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.18.3.082
TI  - Confinement and false vacuum decay on the Potts quantum spin chain
PY  - 2025/03/05
UR  - https://scipost.org/SciPostPhys.18.3.082
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 18
IS  - 3
SP  - 082
A1  - Pomponio, Octavio
AU  - Krasznai, Anna
AU  - Takács, Gábor
AB  - We consider non-equilibrium dynamics after quantum quenches in the mixed-field three-state Potts quantum chain in the ferromagnetic regime. Compared to the analogous setting for the Ising spin chain, the Potts model has a much richer phenomenology, which originates partly from baryonic excitations in the spectrum and partly from the various possible relative alignments of the initial magnetisation and the longitudinal field. We obtain the excitation spectrum by combining semiclassical approximation and exact diagonalisation, and we use the results to explain the various dynamical behaviours we observe. Besides recovering dynamical confinement, as well as Wannier-Stark localisation due to Bloch oscillations similar to the Ising chain, a novel feature is the presence of baryonic excitations in the quench spectroscopy. In addition, when the initial magnetisation and the longitudinal field are misaligned, both confinement and Bloch oscillations only result in partial localisation, with some correlations retaining an unsuppressed light-cone behaviour together with a corresponding growth of entanglement entropy.
ER  -

@Article{10.21468/SciPostPhys.18.3.082,
	title={{Confinement and false vacuum decay on the Potts quantum spin chain}},
	author={Octavio Pomponio and Anna Krasznai and Gábor Takács},
	journal={SciPost Phys.},
	volume={18},
	pages={082},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.18.3.082},
	url={https://scipost.org/10.21468/SciPostPhys.18.3.082},
}