| AVS 62nd International Symposium & Exhibition | |
| Surface Science | Wednesday Sessions |
| Session SS-WeM |
| Session: | Environmental Interfaces, Ambient Surfaces, In-Operando Studies and Adsorption on 2D Materials |
| Presenter: | Andrew Hewitt, North Carolina State University |
| Authors: | A.S. Hewitt, North Carolina State University J. Boltersdorf, North Carolina State University P.A. Maggard, North Carolina State University D.B. Dougherty, North Carolina State University |
| Correspondent: | Click to Email |
Organic molecules coupled to the spin-textured topological surface states of a topological insulator (TI) are expected to result in an interface ideal for organic spintronic devices.1 Exploiting interfacial control at molecule-functionalized TI surface is a crucial step in realizing the potential of these new materials. It has been shown2 that such a coupling may exist, along with a new hybrid-interface state above the Fermi level, between the magnetic molecule Manganese Phthalocyanine (MnPc) and the TI Bi2Te3. We report the suppression of the topological surface state by the adsorption of MnPc molecules as measured by Ultraviolet Photoelectron Spectroscopy. We show a new state emerging below the Fermi level at less than a monolayer coverage of MnPc molecules. The new interface state is different than the topological surface state and the molecular orbitals of the MnPc molecules as evidenced by the modified dispersion with Angle-Resolved Photoelectron Spectroscopy. We also observe an n-doping effect as charge is transferred from the molecule to the TI substrate in agreement with recent work.2,3 We suggest that this interface system may have important implications for understanding the role of local time reversal symmetry breaking in TI’s and in controlling spin injection into these novel materials.
[1] Jakobs et al. DOI: 10.1021/acs.nanolett.5b02213
[2] Sessi et al. Nano Lett. 2014, 14, 5092−5096
[3] Bathon et al. Nano Lett. 2015, 15, 2442−2447