Geometry induced charge separation on a helicoidal ribbon
  We present an exact calculation of the effective geometry-induced quantum potential for a particle confined on a helicoidal ribbon. This potential leads to the appearance of localized states at the rim of the helicoid. In this geometry the twist of the ribbon plays the role of an effective transverse electric field on the surface and thus this is reminiscent of the quantum Hall effect. 
Victor Atanasov, Rossen Dandoloff, Avadh Saxena