High-temperature dynamics in quantum compass models

Briffa, A. K. R.; Zotos, Xenophon

doi:10.1103/PhysRevB.97.064406

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High-temperature dynamics in quantum compass models

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Zotos, Xenophon
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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https://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.064406
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引用

Briffa, A. K. R., & Zotos, X. (2018). High-temperature dynamics in quantum compass models. Physical Review B, 97(6):. doi:10.1103/PhysRevB.97.064406.

引用: https://hdl.handle.net/21.11116/0000-0000-CFBC-4

要旨

We analyze the high-temperature spin dynamics of quantum compass models by a moment expansion method. We point out that the evaluation of moments maps to the enumeration of paths in a branching process on the lattice. This mapping to a statistical mechanics combinatorics problem provides an elegant visualization of this analysis. We present results for the time-dependent spin autocorrelation function (which is of relevance to NMR experiments) for two compass models: the honeycomb (Kitaev) and two-dimensional compass lattice model. Furthermore, following this approach, we argue that in quantum compass models the spin correlations are generically strongly anisotropic and short ranged.