Hole doped Hubbard ladders

TL;DR

This paper investigates stripe formation in six-leg Hubbard ladders, showing that strong Hubbard couplings support stripe ground states, with the amplitude of hole density modulations analyzed across different dopings.

Contribution

It provides new evidence that stripes form in the ground state of six-leg Hubbard ladders at strong couplings, expanding understanding of doping effects in these systems.

Findings

Stripes exist in the ground state at strong Hubbard couplings.

Stripe amplitude depends on doping levels.

Stripe formation is absent at weak couplings.

Abstract

The formation of stripes in six-leg Hubbard ladders with cylindrical boundary conditions is investigated for two different hole dopings, where the amplitude of the hole density modulation is determined in the limits of vanishing DMRG truncation errors and infinitely long ladders. The results give strong evidence that stripes exist in the ground state of these systems for strong but not for weak Hubbard couplings. The doping dependence of these findings is analysed.