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Journal Article

Spin excitations and thermodynamics of the t-J model on the honeycomb lattice


Plakida,  Nikolay M.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Vladimirov, A. A., Ihle, D., & Plakida, N. M. (2018). Spin excitations and thermodynamics of the t-J model on the honeycomb lattice. European Physical Journal B, 91(8): 195. doi:10.1140/epjb/e2018-80712-x.

Cite as: http://hdl.handle.net/21.11116/0000-0002-5EFE-8
We present a spin-rotation-invariant Green-function theory for the dynamic spin susceptibility in the spin-1/2 antiferromagnetic t-J Heisenberg model on the honeycomb lattice. Employing a generalized mean-field approximation for arbitrary temperatures and hole dopings, the electronic spectrum of excitations, the spin-excitation spectrum and thermodynamic quantities (two-spin correlation functions, staggered magnetization, magnetic susceptibility, correlation length) are calculated by solving a coupled system of self-consistency equations for the correlation functions. The temperature and doping dependence of the magnetic (uniform static) susceptibility is ascribed to antiferromagnetic short-range order. Our results on the doping dependencies of the magnetization and susceptibility are analyzed in comparison with previous results for the t-J model on the square lattice.