27 citations · 55 across the 7 of their papers we have counts for
8 papers
Dispersion of low-energy optical excitations in NiPS explained by singlet polaron theory
I. J. Hamad, C. S. Helman, A. E. Feiguin +2
Optical and resonant inelastic X-ray scattering (RIXS) experiments in the van der Waals antiferromagnet NiPS have revealed narrow excitonic resonances near 1.5 eV whose microsc…
Effective one-band models for the 1D cuprate BaSrCuO
Adrian E. Feiguin, Christian Helman, Armando A. Aligia
We consider a multiband Hubbard model for Cu and O orbitals in BaSrCuO similar to the tree-band model for two-dimensional (2D) cuprates. The hopping param…
Determination of superexchange interactions for the CuO chains in LiCuO
N. Aucar Boidi, Christian Helman, Y. Núñez-Fernández +2
Starting from \textit{ab-initio} calculations, we derive a five-band Hubbard model to describe the CuO chains of LiCuO. This model is further simplified to a low-energy…
Development of neutron scattering kernels for cold neutron reflector materials
José Rolando Granada, José Ignacio Márquez Damián, Javier Dawidowski +4
The newest neutron scattering applications are highly intensity-limited techniques that demand reducing the neutron losses between source and detectors. In addition, the nuclear in…
Influence of the Fermi surface shape on magnetotransport: the MnAs case
C. Helman, A. M. Llois, M. Tortarolo
We analyze the influence of the Fermi surface (FS) shape on magnetotransport properties, particularly on the Hall effect in the MnAs compound. It has been observed in MnAs films ev…
2D superconductidy driven by interfacial electron-phonon coupling at the BaPbO/BaBiO bilayer
S. Di Napoli, C. Helman, A. M. Llois +1
The recent discovery of 2D superconductivity at the interface of BaPbO (BPO) and BaBiO (BBO) has motivated us to study in depth the electronic and structural properties and…