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

Artem A. Vladimirov, Dieter Ihle and Nikolay M. Plakida ()
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Artem A. Vladimirov: Joint Institute for Nuclear Research
Dieter Ihle: Institut für Theoretische Physik, Universität Leipzig
Nikolay M. Plakida: Joint Institute for Nuclear Research

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 8, 1-9

Abstract: Abstract 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.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1140/epjb/e2018-80712-x

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