Finite size and temperature effects in the AF Heisenberg model

F. Niedermayer (Bern); P. Hasenfratz

arxiv: hep-lat/9212022 · v1 · submitted 1992-12-18 · ✦ hep-lat · cond-mat

Finite size and temperature effects in the AF Heisenberg model

P. Hasenfratz , F. Niedermayer (Bern) This is my paper

classification ✦ hep-lat cond-mat

keywords staggeredtemperatureeffectsenergyexcitationsheisenbergmagnetizationmodel

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The low temperature and large volume effects in the d=2+1 antiferromagnetic quantum Heisenberg model are dominated by magnon excitations. The leading and next-to-leading corrections are fully controlled by three physical constants, the spin stiffness, the spin wave velocity and the staggered magnetization. Among others, the free energy, the ground state energy, the low lying excitations, staggered magnetization, staggered and uniform susceptibilities are studied here. The special limits of very low temperature and infinite volume are considered also.

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