Fig. 4: Analysis of band structure evolution in CrS2 from monolayer to nanotubes.
From: Ferromagnetic semiconductor nanotubes with room Curie temperatures
a Orthorhombic unit cell of monolayer CrS2. b–d Band structures without strain (b), under 34% tensile strain along x direction (c), and under 12% tensile strain along y direction (d). e The 2D Brillouin zone of monolayer CrS2. f–h Fermi contours at E(k) = EF without strain (f), under 34% tensile strain along x direction (g), and under 12% tensile strain along y direction (h). Schematic diagram of a zigzag nanotube (z1) and the corresponding 1D Brillouin zone (z2). (z3) The Fermi contour of monolayer CrS2 under 34% tensile strain along x direction, lines parallel to Γ-Y represent the 1D Brillouin zone of zigzag nanotubes. (z4) The band structure corresponds to (z3). Schematic diagram of an armchair nanotube (a1) and the corresponding 1D Brillouin zone (a2). (a3) The Fermi contour of monolayer CrS2 under 12% tensile strain along y direction, lines parallel to Γ-X represent the 1D Brillouin zone of armchair nanotubes. (a4) The band structure corresponds to (a3).
