Electronic and magnetic properties of 2D on-surface organic architectures

QUICK INFORMATION
Type
Seminar
Start Date
11-12-2019 10:00
End Date
11-12-2019 11:00
Location
Room 500 - 501, Central Building
Speaker's name
Olha POPOVA
Speaker's institute
University of Basel, PSI
Contact name
Claudine ROMERO
Host name
Nick BROOKES
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Complex self-assembled molecular layers on substrates with engineered architectures and tailored properties are expected to play important role in the miniaturization and development of future nanoscale devices. The work that will be presented addresses the electronic properties of self-assembled metal-organic on-surface architectures confining the surface states – quantum dots (QD), and is aimed at studying the interaction between the molecular adsorbates and the quantum confinement. It provides deeper understanding of the tuning of electronic and magnetic properties of molecular adsorbates across those networks. This knowledge is essential e.g. for the development of organic molecule-based devices.

In summary, the strength of this work lies in the provision of systematic and comprehensive investigation of the interaction and surface-driven modifications of supported metal-organic nanoporous complexes on noble metal surfaces and new insight into site specific electronic and magnetic properties of confined and delocalized surface states. Since nanoporous networks are serving as an ideal template for hosting adsorbates, it is possible to tune electronic states of the quantum confinements by controlled selectivity of the adsorbates. These adsorbate-filling configurations are accurately simulated with use of  EBEM/EPWE methods, examine into complexity of confinement and interdot coupling effects. While hosting molecular adsorbates across the network, the QD electronic structure can change dramatically. By varying the metal center of organic adsorbates, one can change the density and distribution of the valence electrons in the metal center of the molecule, providing means to tune the changes of the QD electronic structure. Study combines multiple surface sensitive techniques such as Scanning tunneling microscopy/spectroscopy (STM/STS), X-ray photoelectron spectroscopy (XPS), Angle Resolved Photoelectron Spectroscopy (ARPES), Photoelectron Diffraction (PhD) and Density Functional Theoretical calculations (DFT). These results differ from previous models of hybrid metal-organic systems and provide a consistent description of their magnetic moments and Kondo physics in terms of spin and orbital multiplicity.

References:
[1] J. Lobo-Checa, et al, Science 325, 300 (2009).
[2] O.Popova, et al, in preparation.
[3] I. Piquero Zulaica, O. Popova, et al, NJP (2019).

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