We report spin- and angle-resolved photoemission studies of a topological semimetal from the infinitely adaptive series between elemental Bi and Bi 2Se3. The compound, based on Bi4Se3, is a 1:1 natural superlattice of alternating Bi2 layers and Bi 2Se3 layers; the inclusion of S allows the growth of large crystals, with the formula Bi4Se2.6S0.4. The crystals cleave along the interfaces between the Bi2 and Bi 2Se3 layers, with the surfaces obtained having alternating Bi or Se termination. The resulting terraces, observed by photoemission electron microscopy, create avenues suitable for the study of one-dimensional topological physics. The electronic structure, determined by spin- and angle-resolved photoemission spectroscopy, shows the existence of a surface state that forms a large, hexagonally shaped Fermi surface around the Γ point of the surface Brillouin zone, with the spin structure indicating that this material is a topological semimetal.
|Physical Review B - Condensed Matter and Materials Physics
|Published - Dec 5 2012
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics