Nematic and supernematic phases in Kagome quantum antiferromagnets under a magnetic field

Abstract

Optimizing translationally invariant infinite-Projected Entangled Pair States (iPEPS), we investigate the spin-2 Affleck-Kennedy-Lieb-Tasaki (AKLT) and spin-1 Heisenberg models on the Kagome lattice as a function of magnetic field. We found that the magnetization curves offer a wide variety of compressible and incompressible phases. Incompressible nematic phases breaking the lattice $C_3$ rotation -- for which we propose simple qualitative pictures -- give rise to magnetization plateaux at reduced magnetization $m_z=5/6$ and $m_z=1/3$ for spin-2 and spin-1, respectively, in addition to the $m_z=0$ plateaux characteristic of zero-field gapped spin liquids. Moving away from the plateaux we observe a rich variety of compressible superfluid nematic -- named "supernematic" -- phases breaking spontaneously both point group and spin-U(1) symmetries, as well as a superfluid phase preserving lattice symmetries. We also identify the nature -- continuous or first-order -- of the various phase transitions. Possible connections to experimental spin-1 systems are discussed.

arXiv comment5 pages + supplemental material (6 pages)

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