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Published on: August 2, 2019
Critical behavior of a quantum chain with four-spin interactions in the presence of longitudinal and transverse
B Boechat1, J Florencio1, A Saguia1
1Departamento de Física, Universidade Federal Fluminense, Avenida Litorânea s/n, Niterói 24210-340, RJ, Brazil.
Abstract:
We study the ground-state properties of a spin-1/2 model on a chain containing four-spin Ising-like interactions in the presence of both transverse and longitudinal magnetic fields. We use entanglement entropy and finite-size scaling methods to obtain the phase diagrams of the model. Our numerical calculations reveal a rich variety of phases and the existence of multicritical points in the system. We identify phases with both ferromagnetic and antiferromagnetic orderings. We also find periodically modulated orderings formed by a cluster of like spins followed by another cluster of opposite like spins. The quantum phases in the model are found to be separated by either first- or second-order transition lines.
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