Abstract
The spin density of states of a two-dimensional antiferromagnet in magnetic field having spins- 1 / 2 and interacting with acoustic phonons is investigated in the nonadiabatic approximation using the quantum Monte Carlo method. It is found the gap energy Δ in the single particle spin excitations spectrum closes at magnetic field Δ ≃ H c , W ph < W s and Δ ≃ ( 1 / 2 ) H c , W ph > W s , where W ph and W s are the bandwidths of phonon and spin excitations in antiferromagnet.
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