Probing the spatial and momentum distribution of confined surface states in a metal coordination network

Abstract

The Shockley surface state on Cu(111) reacts sensitively to the perturbation by molecular adsorbates on the surface. In the porous structure of a metal-coordinated molecular network on Cu(111), the surface state is confined to a series of discrete states. Energy and momentum of eigenstates in the pores are related to both the energy dispersion of the free surface state and the geometric and energetic details of the confining barrier formed by the molecular network. The penetration of the confined state into the barrier is found to be sensitive to the constituting architectural elements.

Kagome metal-organic frameworks as a platform for strongly correlated electrons

“…In the specific case of Cu-DCA, copper atoms form a regular honeycomb lattice (dark blue spheres in figure 1). The choice of copper is dictated by the recent experimental reports of monolayer Cu-DCA grown on metallic Cu(111) substrate [26,27].…”

Surface science at the PEARL beamline of the Swiss Light Source

“…It has been designed by a consortium of Swiss research groups active in surface science for the study of local atomic geometry at the surface of a wide range of novel organic and inorganic systems. Such systems include, for example, functional organic molecules (Fasel et al, 1996;Muntwiler et al, 2005;Pawlak et al, 2012), supramolecular networks (Barth, 2007;Lobo-Checa et al, 2009;Zhang et al, 2014), molecular magnets (Scheybal et al, 2005), chiral recognition (Fasel et al, 2004;Greber et al, 2006;Schillinger et al, 2007), endohedral fullerenes (Treier et al, 2009;Westerströ m et al, 2012Westerströ m et al, , 2014, ultrathin metal oxides (Jaouen et al, 2015), surfaces of ferroelectrics (Despont et al, 2006) and surface alloys (Corso et al, 2010;Pawlak et al, 2015).…”

“…STM and STS probe the local density of states directly, and are able to detect unoccupied states. Both technical features are helpful in the case of a two-dimensional metalorganic network of 9,10-dicyano-anthracene (DCA) molecules (Zhang et al, 2014). Grown by molecular beam deposition on a clean Cu(111) substrate at room temperature, this network exhibits a long-range periodic 8 Â 8 porous superstructure as can be seen in the STM image in Fig.…”

Emerging topological states in quasi‐two‐dimensional materials

“…Although these materials show various novel topological properties, those theoretically proposed structures has not been fabricated experimentally yet. On the other hand, the synthesis of some kagomé organometallic lattices consisting of π ‐conjugated nickel‐bis‐dithiolene or Cu‐dicyanoanthracene (DCA) becomes possible (Figure (b) and (c)), benefitting from recent experimental progress. Later, QSH states with energy gaps of about 10 meV in these two lattices are demonstrated based on density functional theory calculations, which provides a viable approach for designing topological electronics in organic materials.…”