116 citations · 1.6k across the 79 of their papers we have counts for
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Photoemission spectroscopy using virtual photons emitted by positron sticking: a new probe of the top layer surface electronic structure
Alexander J Fairchild, Varghese A. Chirayath, Bernardo Barbiellini +3
We present a spectroscopic method which utilizes virtual photons to selectively measure the electronic structure of the top-most atomic layer. These virtual photons are created whe…
Many-body effects in porphyrin-like transition metal complexes embedded in graphene
Andrew Allerdt, Hasnain Hafiz, Bernardo Barbiellini +2
We introduce a new computational method to study porphyrin-like transition metal complexes, bridging density functional theory and exact many-body techniques, such as the density m…
Nature of the positron state in CdSe quantum dots
Wenqin Shi, Vincent Callewaert, Bernardo Barbiellini +11
Previous studies have shown that positron-annihilation spectroscopy is a highly sensitive probe of the electronic structure and surface composition of ligand-capped semiconductor Q…
Gate-tunable magnetism of C adatoms on graphene
J. Nokelainen, I. V. Rozhansky, B. Barbiellini +2
We have performed density functional theory calculations of graphene decorated with carbon adatoms, which bind at the bridge site of a C--C bond. Earlier studies have shown that th…
Direct observation of electron emission as a result of a VVV Auger transition in the valence band of Graphene
V. A. Chirayath, V. Callewaert, M. D. Chrysler +11
We report the first direct observation of electron emission into the vacuum as a result of a VVV Auger transition resulting from the relaxation of a deep hole in the valence band.…
Surfaces of colloidal PbSe nanocrystals probed by thin-film positron annihilation spectroscopy
L. Chai, W. Al-Sawai, Y. Gao +11
Positron annihilation lifetime spectroscopy (PALS) and positron-electron momentum density (PEMD) studies on multilayers of PbSe nanocrystals (NCs), supported by transmission electr…
Exactly soluble model of resonant energy transfer between molecules
C. King, B. Barbiellini, D. Moser +1
Förster's theory of resonant energy transfer (FRET) predicts the strength and range of exciton transport between separated molecules. We introduce an exactly soluble model for FRET…
On the Energy Transfer Performance of Mechanical Nanoresonators Coupled with Electromagnetic Fields
Hooman Javaheri, Bernardo Barbiellini, Guevara Noubir
We study the energy transfer performance in electrically and magnetically coupled mechanical nanoresonators. Using the resonant scattering theory, we show that magnetically coupled…
Electron correlations, spontaneous magnetization and momentum density in quantum dots
A. Bansil, D. Nissenbaum, B. Barbiellini +1
The magnetization of quantum dots is discussed in terms of a relatively simple but exactly solvable model Hamiltonian. The model predicts oscillations in spin polarization as a fun…