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We show a strong mesoscopic transverse growth arrest that co-exists with ahigh-speed longitudinal growth in single-crystalline KDP crystals with largeaspect ratios. To explain this unique growth morphology, which cannot beexplained by any current theories, we introduce a new set of surfaceconcentration rate equations and demonstrate a molecular-orientation-selectivesurface self-shielding and channeling mechanism. We introduce a localsupersaturation and calculate crystal growth driving force and growth rate,demonstrating quick arrest of both quantities as results ofmolecule-orientation selectivity based self-shielding and channeling effects.The growth dynamics thus derived can satisfactorily explain all experimentalobservations in single-crystalline KDP crystal growth reported here.

Strong mesoscopic transverse growth suppression in high-speed unidirectional growth of KDP single crystals