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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session: Correlated Electrons 1

TT 17.20: Poster

Montag, 1. April 2019, 15:00–18:30, Poster D

Exotic criticality in the dimerized spin-1 XXZ chain with single-ion anisotropy — Satoshi Ejima¹, Tomoki Yamaguchi², Fabian H. L. Essler³, Florian Lange¹, Yukinori Ohta², and •Holger Fehske¹ — ¹Institute of Physics, University Greifswald, 17489 Greifswald, Germany — ²Department of Physics, Chiba University, Chiba 263-8522, Japan — ³The Rudolf Peierls Centre for Theoretical Physics, Oxford University, Oxford OX1 3NP, UK

We consider the dimerized spin-1 XXZ chain with single-ion anisotropy D. In absence of an explicit dimerization there are three phases: a large-D, an antiferromagnetically ordered and a Haldane phase. This phase structure persists up to a critical dimerization, above which the Haldane phase disappears. We show that for weak dimerization the phases are separated by Gaussian and Ising quantum phase transitions. One of the Ising transitions terminates in a critical point in the universality class of the dilute Ising model. We comment on the relevance of our results to experiments on quasi-one-dimensional anisotropic spin-1 quantum magnets.