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- W3216814196 abstract "Recently there has been a renewed interest in properties of the higher-spin Kitaev models, especially their low-dimensional analogues with additional interactions. These quasi-1D systems exhibit rich phase diagrams with symmetry-protected topological phases, Luttinger liquids, hidden order, and higher-rank magnetism. However, the nature of the pure spin-$S$ Kitaev chains are not yet fully understood. Earlier works found a unique ground state with short-ranged correlations for $S = 1$, and an intriguing double-peak structure in the heat capacity associated with an entropy plateau. To understand the low-energy excitations and thermodynamics for general $S$ we study the anisotropic spin-$S$ Kitaev chain. Starting from the dimerized limit we derive an effective low-energy Hamiltonian at finite anisotropy. For half-integer spins we find a trivial effective model, reflecting a non-local symmetry protecting the degeneracy, while for integer $S$ we find interactions among the flux degrees of freedom that select a unique ground state. The effective model for integer spins is used to predict the low-energy excitations and thermodynamics, and we make a comparison with the semiclassical limit through linear spin wave theory. Finally, we speculate on the nature of the isotropic limit." @default.
- W3216814196 created "2021-12-06" @default.
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- W3216814196 date "2022-03-16" @default.
- W3216814196 modified "2023-09-26" @default.
- W3216814196 title "Insights into the anisotropic spin- <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>S</mml:mi></mml:math> Kitaev chain" @default.
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- W3216814196 doi "https://doi.org/10.1103/physrevresearch.4.013205" @default.
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