C. Helman

activity

20142026

most citedLarge perpendicular magnetic anisotropy in magnetostrictive Fe

_{1 - x}

_{x}

thin films

27 citations · 55 across the 7 of their papers we have counts for

collaborators

Showing cond-mat.str-elShow all

4 papers · 1 filter

cond-mat.str-el2026

Dispersion of low-energy optical excitations in NiPS $_{3}$ 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 $_{3}$ have revealed narrow excitonic resonances near 1.5 eV whose microsc…

cond-mat.str-el2023★ 8 cited

Effective one-band models for the 1D cuprate Ba $_{2 - x}$ Sr $_{x}$ CuO $_{3 + δ}$

Adrian E. Feiguin, Christian Helman, Armando A. Aligia

We consider a multiband Hubbard model $H_{m}$ for Cu and O orbitals in Ba $_{2 - x}$ Sr $_{x}$ CuO $_{3 + δ}$ similar to the tree-band model for two-dimensional (2D) cuprates. The hopping param…

cond-mat.str-el2022★ 2 cited

Determination of superexchange interactions for the CuO $_{2}$ chains in LiCu $_{2}$ O $_{2}$

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 $_{2}$ chains of LiCu $_{2}$ O $_{2}$ . This model is further simplified to a low-energy…

cond-mat.str-el2018★ 11 cited

Spin and orbital ordering in bilayer Sr $_{3}$ Cr $_{2}$ O $_{7}$

A. A. Aligia, C. Helman

Using maximally localized Wannier functions obtained from DFT calculations, we derive an effective Hubbard Hamiltonian for a bilayer of Sr $_{3}$ Cr $_{2}$ O $_{7}$ , the $n = 2$ member of the R…

Dispersion of low-energy optical excitations in NiPS3​ explained by singlet polaron theory

Effective one-band models for the 1D cuprate Ba2−x​Srx​CuO3+δ​

Determination of superexchange interactions for the CuO2​ chains in LiCu2​O2​

Spin and orbital ordering in bilayer Sr3​Cr2​O7​

Dispersion of low-energy optical excitations in NiPS $_{3}$ explained by singlet polaron theory

Effective one-band models for the 1D cuprate Ba $_{2 - x}$ Sr $_{x}$ CuO $_{3 + δ}$

Determination of superexchange interactions for the CuO $_{2}$ chains in LiCu $_{2}$ O $_{2}$

Spin and orbital ordering in bilayer Sr $_{3}$ Cr $_{2}$ O $_{7}$