| AVS 61st International Symposium & Exhibition | |
| Magnetic Interfaces and Nanostructures | Monday Sessions |
| Session MI-MoA |
| Session: | Topological Insulators/Rashba Effect |
| Presenter: | Andrew Weber, University of Missouri-Kansas City |
| Authors: | A.P. Weber, University of Missouri-Kansas City I. Pletikosic, Princeton University Q.D. Gibson, Princeton University H. Ji, Princeton University T. Yilmaz, University of Connecticut J.T. Sadowski, Brookhaven National Laboratory E. Vescovo, Brookhaven National Laboratory A.V. Fedorov, Lawrence Berkeley National Laboratory A.N. Caruso, University of Missouri-Kansas City G. Gu, Brookhaven National Laboratory B. Sinkovic, University of Connecticut R.J. Cava, Princeton University T. Valla, Brookhaven National Laboratory |
| Correspondent: | Click to Email |
Spin-polarized surface electronic structures arising from broken inversion symmetry and a topologically non-trivial excitation gap in the underlying bulk show promise as platforms for realizing of exotic quantum phases (e.g. Majorana fermion modes) and spin-filter transport applications, however, the opportunities presented by these systems for exploring fundamental aspects of the spin-orbit interaction (SOI) in 2D have been underemphasized. The effect of SOI in solids can deviate from conventional models because it is sensitive to the full quantum description of the system, including atomic quantum numbers, the effective electric field, and spatial orbital and crystal symmetries. Together, these conditions shape the band structure and spin- and orbital-texture, and dictate the strength and anisotropy of interband hybridizations. Through spin- and angle-resolved photoemission spectroscopy of semi-ionic topological (Bi2)m(Bi2X3)n (X= Se, Te) superlattice materials, we have identified a variety of unconventional SOI effects acting on topological surface states. We will discuss how tuning the surface charge dipole and termination chemistry controls: (1) the electron band dispersion, (2) interband hybridizations, (3) the size, shape, and spin-topology of the Fermi surface and (4) the sign and magnitude of the Fermi velocity.