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Jeudi 23 mai 2019 - 14:30

Designer spin liquids (¡¡ attention créneau inhabituel !!)

Nic Shannon (OIST, Okinawa, Japon)

par Revaz Ramazashvili - 23 mai 2019

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 Dy2Ti_2O7, 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, and predictions are made for the structure factors which woud be observed in neutron-scatttering experiments. The relevance of these results to experiments on pyrochlore magnets, is also discussed.

[1] O. Benton, L.D.C. Jaubert, H. Yan and Nic Shannon, Nat. Commun. 7, 11572 (2016)

[2] M. Taillefumier, O. Benton, H. Yan, L. D. C. Jaubert and Nic Shannon, Phys. Rev. X 7, 041057 (2017)

[3] O. Benton, L. D. C. Jaubert, R. R. P. Singh, J. Oitmaa and Nic Shannon, Phys. Rev. Lett. 121, 067201 (2018)

[4] H. Yan, O. Benton, L. D. C. Jaubert and Nic Shannon, arXiv:1902.10934

Post-scriptum :

contact : R. Ramazashvili