Recovery of of the bulk-like electronic structure of manganese phthalocyanine beyond the first monolayer on Bi2Te3

SURFACE SCIENCE

卷:662

Article

Hewitt, A. S.^1,2  Boltersdorf, J.³  Maggard, P. A.³  Dougherty, D. B.^1,2 

[1] North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

[2] North Carolina State Univ, Organ & Carbon Elect Lab, Raleigh, NC 27695 USA

[3] North Carolina State Univ, Dept Chem, Raleigh, NC USA

关键词: Topological insulator;    Organic semiconductor film;    Electronic structure;   

DOI  :  10.1016/j.susc.2017.03.014

来源: Elsevier

【 摘 要 】

The evolution of electronic structure of manganese phthalocyanine on Bi2Te3 shows a transition to a bulk-like aspect abruptly after completion of the first layer. This allows the inference that, in the first layer, there is charge transfer and electronic hybridization involving the occupied Mn-derived d orbitals of the molecule into the conduction band of the substrate. The charge transfer coupling is seen using angle-resolved ultraviolet photoelectron spectroscopy by monitoring the evolution of work function and band structure with increasing molecular film thickness. The electronic structure in the second layer is more bulk-like as indicated by the reappearance of well-known low energy d orbitals that were depopulated in the first layer. Scanning tunneling microscopy shows that the transition to bulk like behavior is also reflected in film structure as a transition from a unique disordered monolayer to a locally ordered and dense second layer. These observations are relevant to ongoing efforts to control topological insulator interfaces especially for spintronics applications.

【 授权许可】

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