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Séminaire MCBT

Jeudi 26 Novembre à 14h00,
Salle Remy Lemaire, K223

Orateur : Ludovic Jaubert (OIST Japon)
"A kagome map of spin liquids"

Abstract

Despite its deceptive simplicity, few concepts have more fundamental implications than chirality. In magnetic materials, spin chirality gives rise to unconventional phenomena such as the anomalous Hall effect and multiferroicity, taking an enhanced flavour in the so-called spin-liquid phases where magnetic disorder prevails. The kagome lattice sits at the crossroad of these ideas. Here we shall bring together a network of kagome spin liquids with anisotropic and Dzyaloshinskii-Moriya interactions. This network revolves around the Ising antiferromagnet and ends on (ferromagnetic) chiral spin liquids with spontaneously broken time-reversal symmetry. As for the celebrated Heisenberg antiferromagnet, it now belongs to a triad of equivalently disordered phases. The present work provides a unifying theory of kagome spin liquids with time-reversal nearestneighbour Hamiltonians, and promising applications for rare-earth based kagome materials and optical-lattice experiments.

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