Fig. 5: Spin Hall conductivity calculation for Bi2Se3 structure.
From: Giant tunable spin Hall angle in sputtered Bi2Se3 controlled by an electric field
a Band structure projected by spin Berry curvature on a log scale (up panel) and the k-resolved spin Berry curvatures (down panel) for the 0.5% biaxial strain bulk Bi2Se3. b Charge density difference of heterostructure of Bi2Se3 on TiO-terminal PbTiO3(001) surface. The picture on the left shows the application of the negative external electric field (along the z direction) on the heterostructure. Simultaneously, the built-in electric field along the −z direction is generated in PbTiO3. The polarization of PbTiO3 is P↑. The picture on the right is the opposite. The polarization of PbTiO3 is P↓. The red and blue areas indicate loss and gain electrons, respectively. The Pb, Ti, O, Bi, and Se atoms are depicted by gray, light blue, red, magenta, and green balls, respectively. c SHC as a function of the biaxial strain for bulk Bi2Se3. d SHC as a function of the charge doping for the bulk Bi2Se3 under 0.5% biaxial strain. The initial state of Bi2Se3 without strain and charge doping is marked with the blue hexagon symbol.
