Fig. 2 (IMAGE) Science China Press Caption Schematic crystal structures and electronic localization functions (ELFs) of 2D, 1D, and soft 1D Bi2Se3, Sb2Se3 and BiSeI, respectively. Schematic diagrams and corresponding crystal structures of (a, d) 2D slabs in Bi2Se3, (b, e) 1D chain in Sb2Se3 and (c, f) 1D chain with migration of halogens in BiSeI. The crystal structures of Bi2Se3, Sb2Se3and BiSeI viewed along the c direction are given in (g-i), respectively. (j-l) The projected ELF along the chain. The isosurface level of ELF is 0.9. Credit ©Science China Press Usage Restrictions Use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.