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Based on {\em ab initio} calculation, we propose a new structure for thefundamental excitation of the reconstructed 30$^\circ$ partial dislocation insilicon. This soliton has a rare structure involving a five-fold coordinatedatom near the dislocation core. The unique electronic structure of this defectis consistent with the electron spin resonance signature of the hithertoenigmatic thermally stable R center of plastically deformed silicon. We presentthe first {\em ab initio} determination of the free energy of the soliton,which is also in agreement with the experimental observation. Thisidentification suggests the possibility of an experimental determination of thedensity of solitons, a key defect in understanding the plastic flow of thematerial.Comment: 6 pages, 5 postscript figure

New physics of the 30° partial dislocation in silicon revealed throughab initiocalculation