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Using the spin-wave approximation elementary excitations of a semi-infinitetwo-dimensional $S=\frac12$ Heisenberg antiferromagnet are considered. Thespectrum consists of bulk modes -- standing spin waves and aquasi-one-dimensional mode of boundary spin waves. These latter excitationseject bulk modes from two boundary rows of sites, thereby dividing theantiferromagnet into two regions with different dominant excitations. As aresult absolute values of nearest-neighbor spin correlations on the edge exceedthe bulk value.

Near-Boundary and Bulk Regions of a Semi-Infinite Two-Dimensional Heisenberg Antiferromagnet