Condensed Matter Seminar: Understanding Spin-1 Kagome Antiferromagnet through the Hida Model
Starts 18 Jun 2019 11:00
Ends 18 Jun 2019 12:00
Central European Time
Leonardo Building - Luigi Stasi Seminar Room
Antiferromagnetically interacting quantum spins on kagome lattice form a highly frustrated system. While the spin-1/2 kagome problem continues to be debated, it has been recently shown (by us and few others) that the spin-1 kagome Heisenberg antiferromagnet realises a spontaneously trimerized quantum paramagnetic ground state. We further look into the dynamics of this trimerization through a spin-1/2 model realised in a family of organic salts and first studied by Hida. In a certain strong coupling limit, the Hida model becomes the spin-1 kagome Heisenberg model, while in the opposite limit, it describes a system of weakly coupled antiferromagnetic spin-1/2 hexagons. We study the ground state of the Hida model from this weak to strong coupling limit, and systematically understand the trimerization as it occurs for the spin-1 kagome antiferromagnet. We also discuss its experimental signatures by calculating the spin structure factor.
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