Cristiano Nisoli, Nathaniel M. Gabor, Paul E. Lammert, J. D. Maynard, and Vincent H. Crespi
Phys. Rev. Lett. 102, 186103 (2009)
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| A specimen of Mammillaria elongata displaying a helical morphology ubiquitous to nature, a magnetic cactus of dipoles on stacked bearings, and a schematic of a wrapped Bravais lattice showing the angular offset (screw angle) and the axial separation a between particles. |
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