Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Frustrated Magnets - Spin Liquids (joint session TT/MA)

MA 6.1: Vortrag

Montag, 1. April 2019, 15:00–15:15, Theater

Designer spin liquids — •Nic Shannon1,2, Han Yan2, Owen Benton3, and Ludovic Jaubert41TUM, Garching, Germany — 2OIST, Okianwa, Japan — 3RIKEN, Wakoshi, Japan — 4Universite Bordeaux, Bordeaux, France

The pyrochlore lattice has proved a rich source of spin liquids, both in theory, and in the experiment. The best known examples are “spin ices” such as Dy2Ti2O7, which offer a concrete realisation of a U(1) lattice gauge theory, complete with magnetic monopole excitations. However many other spin liquid-materials are known, with many different types of phenomenology, motivating the question “what else is out there ?”

In this talk we show how a variety of different spin liquids on the pyrochlore lattice can be generated systematically, by exploiting the degeneracies which arise where different forms of order meet. As examples we present the tensor spin liquid found in models of pyrochlores with anisotropic exchange interactions [1]; the nematic spin liquid found in frustrated quantum spin ice [2,3]; and a rank-2 U(1) spin liquid found by perturbing a simple Heisenberg antiferromagnet [4]. In all cases, the predictions of the relevant gauge theory are compared with the results of Monte Carlo simulation. The relevance of these results to experiments on pyrochlore magnets, including Tb2Ti2O7, is also discussed.
O. Benton et al., Nat. Commun. 7, 11572 (2016)
M. Taillefumier et al., Phys. Rev. X 7, 041057 (2017)
O. Benton et al., Phys. Rev. Lett. 121, 067201 (2018)
H. Yan et al., preprint.

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