Quantum confinement in self-assembled two-dimensional nanoporous honeycomb networks at close-packed metal surfaces

Quantum confinement of a two-dimensional electron gas by supramolecular nanoporous networks is investigated using the boundary elements method based on Green's functions for finite geometries and electron plane wave expansion for periodic systems. The "particle in a box" picture was a...

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Bibliographic Details
Published in:The Journal of chemical physics 2015-03, Vol.142 (10), p.101931-101931
Main Authors: Kepčija, N, Huang, T-J, Klappenberger, F, Barth, J V
Format: Article
Language:English
Subjects:
Adsorbates
Boundary element method
Computer simulation
CONFINEMENT
Confining
COPPER
COUPLING
Density distribution
DENSITY OF STATES
ELECTRON DENSITY
ELECTRON GAS
ELECTRONS
GREEN FUNCTION
Honeycomb construction
LIFETIME
Metal surfaces
NANOSCIENCE AND NANOTECHNOLOGY
ORGANOMETALLIC COMPOUNDS
Photoelectric emission
PHOTOELECTRON SPECTROSCOPY
Plane waves
POTENTIALS
Quantum confinement
QUANTUM DOTS
QUANTUM WELLS
Scattering
Self-assembly
SILVER
Spectroscopy
Spectrum analysis
SURFACES
TUNNEL EFFECT
TWO-DIMENSIONAL SYSTEMS
WAVE PROPAGATION
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Summary:Quantum confinement of a two-dimensional electron gas by supramolecular nanoporous networks is investigated using the boundary elements method based on Green's functions for finite geometries and electron plane wave expansion for periodic systems. The "particle in a box" picture was analyzed for cases with selected symmetries that model previously reported architectures constructed from organic and metal-organic scattering centers confining surface state electrons of Ag(111) and Cu(111). First, by analyzing a series of cases with systematically defined parameters (scattering geometry, potentials, and effective broadening), we demonstrate how the scattering processes affect the properties of the confined electrons. For the features of the local density of states reported by scanning tunneling spectroscopy (STS), we disentangle the contributions of lifetime broadening and splitting of quantum well states due to coupling of neighboring quantum dots. For each system, we analyze the local electron density distribution and relate it to the corresponding band structure as calculated within the plane-wave expansion framework. Then, we address two experimental investigations, where in one case only STS data and in the other case mainly angle-resolved photoemission spectroscopy (ARPES) data were reported. In both cases, the experimental findings can be successfully simulated. Furthermore, the missing information can be complemented because our approach allows to correlate the information obtained by STS with that of ARPES. The combined analysis of several observations suggests that the scattering potentials created by the network originate primarily from the adsorbate-induced changes of the local surface dipole barrier.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4913244