Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 85: Topological Insulators 2 (MA with HL/TT)

HL 85.6: Talk

Thursday, March 19, 2015, 16:15–16:30, EB 202

Probing the Electronic Properties of Individual MnPc Molecules Coupled to Topological States — •Thomas Bathon¹, Paolo Sessi¹, Konstantin Kokh², Oleg Tereshchenko², and Matthias Bode¹ — ¹Physikalisches Institut, Experimentelle Physik 2, Universitaet Wuerzburg, Am Hubland, 97074 Wuerzburg, Germany — ²Novosibirsk State University, 630090 Novosibirsk, Russia

Hybrid organic-inorganic interfaces have been widely reported to host emergent properties that go beyond those of their single constituents. Coupling molecules to the recently discovered topological insulators, which possess linearly dispersing and spin-momentum-locked Dirac fermions, may offer a promising platform towards new functionalities.

Here, we report a scanning tunneling microscopy and spectroscopy study of the prototypical interface between MnPc molecules and a Bi₂Te₃ surface. MnPc is found to bind stably to the substrate through its central Mn atom. The adsorption process is only accompanied by a minor charge transfer across the interface, resulting in a moderately n-doped Bi₂Te₃ surface. More remarkably, topological states remain completely unaffected by the presence of the molecules, as evidenced by the absence of scattering patterns around adsorption sites. Interestingly, we show that, while the HOMO and LUMO orbitals closely resemble those of MnPc in the gas phase, a new hybrid state emerges through interaction with the substrate.