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The hole-doped 2D t-J model is studied by exact diagonalization on a 5 x 4cluster which, unlike the standard tilted square clusters, can in principleaccomodate an antiphase domain wall. For hole concentration 10% and J/t >= 0.5the ground state energy/site is lower than the conventional tilted square20-site-cluster. In the ground state two holes form a loosely bound pair pinnedto an antiphase domain wall. The dynamical density correlation function showssharp quasiparticle-like peaks, reminiscent of the `holons' in 1D chains, whichsuggest the existence of soliton-like, propagating domain walls. The dynamicalcorrelation function of the bond-singlet operator has a low-energy peakstructure characteristic of columnar Spin-Peierls order, the dynamical spincorrelation function shows an intense and isolated `resonance peak' near(pi,pi).Comment: 4 pages with 5 eps-figure

Dynamical domain walls and spin-Peierls order in doped antiferromagnets: Evidence from exact diagonalization of small clusters