Spin excitations and thermodynamics of the t-J model on the honeycomb lattice
Joint Institute for Nuclear Research,
2 Institut für Theoretische Physik, Universität Leipzig, 04109 Leipzig, Germany
3 Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany
a e-mail: firstname.lastname@example.org
Received in final form: 15 May 2018
Published online: 30 August 2018
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.
Key words: Solid State and Materials
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