Work

Entanglement and quench dynamics in the thermally perturbed tricritical fixed point

Year: 2026

Type: article

Abstract: We consider the Blume–Capel model in the scaling limit to realize the thermal perturbation of the tricritical Ising fixed point. We develop a numerical scaling limit extrapolation for one-point functions and Rényi entropies in the ground state. In a mass quench scenario, we found long-lived oscillations despite the absence of explicit spin-flip symmetry breaking or confining potential. We construct form factors of branch-point twist fields in the paramagnetic phase. In the scaling limit of small quenches, we verify form factor predictions for the energy density and leading magnetic field using the dynamics of one-point functions, and branch-point twist fields using the dynamics of Rényi entropies.

Source: SciPost Physics

DOI: 10.21468/scipostphys.20.2.030

Authors: Csilla Király, Máté Lencsés

Institutions: Budapest University of Technology and Economics, HUN-REN Wigner Research Centre for Physics

Language: English

Topic: Quantum many-body systems

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: Hungarian Scientific Research Fund, Magyar Tudományos Akadémia, Nemzeti Kutatási Fejlesztési és Innovációs Hivatal

Award: G4525785112