Solitons in spiraling Vogel lattices
  We address light propagation in Vogel optical lattices and show that such lattices support a variety of stable soliton solutions in both self-focusing and self-defocusing media, whose propagation constants belong to domains resembling gaps in the spectrum of a truly periodic lattice. The azimuthally-rich structure of Vogel lattices allows generation of spiraling soliton motion. 
Yaroslav V. Kartashov, Victor A. Vysloukh, Lluis Torner
physics.optics nlin.PS