Extended Data Fig. 2: Burgers vector and Frank angle of disclinations.
From: Trapped fractional charges at bulk defects in topological insulators
a, b, Demonstration of calculating the Burgers vector and Frank angle for a C4-symmetric square lattice with the type-I disclination (a) and type-II disclination (b). The black arrows indicate the vector being parallel transport enclosing the disclination core and the dashed grey arrows indicate that vector in the process of the parallel transport. c, d, The Wannier centre configuration and fractional charge in defective lattices with the type-I disclination (c) and type-I disclination (d). e, Allowed positions of Wannier centres by the C4 symmetry in one unit cell.
