Fig. 8: Radial polarization driven by radial strain gradient in nanotubes.
From: Ferromagnetic semiconductor nanotubes with room Curie temperatures

a Cross-sectional view of a zigzag CrS2 nanotube showing compressive strain in the inner wall and tensile strain in the outer wall. b Dependence of inner and outer wall strain on the nanotube perimeter. c The radial electrostatic potential VR of Z-18-CrS2. VR inside of tube is 0.51 eV lower than outside.