Logarithmic negativity and ground-state phase diagram of the 1D antiferromagnetic spin-1 Heisenberg model with single-ion anisotropy

Vladimir V. Papoyan, Giacomo Gori, Vladimir V. Papoyan, Andrea Trombettoni, Nerses Ananikian

Published 2022-12-19Version 1

Ground-state entanglement properties in the 1D antiferromagnetic spin-1 Heisenberg model with external magnetic field B and single-ion anisotropy D are investigated. The logarithmic negativity for nearest and non-nearest neighbor sites on finite chains is obtained. The resulting phase diagram is discussed in the B - D plane, and a line where the energy density is independent on the size is determined and shown to end in a triple point. Finally, results for the logarithmic negativity on finite chains at finite temperature as a function of B and D are presented.