Striped phases in the two-dimensional Hubbard model with long-range Coulomb interaction

TL;DR

This paper explores how long-range Coulomb interactions influence stripe domain wall formation in the two-dimensional Hubbard model, revealing that these interactions promote specific stripe patterns relevant to copper and nickel oxides.

Contribution

It demonstrates that long-range interactions significantly affect the charge and spin textures of domain walls in the Hubbard model, a novel insight into electronic phase behavior.

Findings

Long-range interactions favor half-filled vertical stripes with period doubling.

Local interactions promote charge segregation in stripe domain walls.

Results suggest electronic interactions influence domain wall textures in oxides.

Abstract

We investigate the formation of partially filled domain walls in the two-dimensional Hubbard model in the presence of long-range interaction. Using an unrestricted Gutzwiller variational approach we show that: i) the strong local interaction favors charge segregation in stripe domain walls; ii) The long-range interaction favors the formation of half-filled vertical stripes with a period doubling due to the charge and a period quadrupling due to the spins along the wall. Our results show that, besides the underlying lattice structure, also the electronic interactions can contribute to determine the different domain wall textures in Nd doped copper oxides and nickel oxides.