Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 17: Poster Session: Correlated Electrons 1
TT 17.20: Poster
Monday, April 1, 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.