Superconductivity in the three-leg Hubbard ladder: a Quantum Monte Carlo study

TL;DR

This study uses Quantum Monte Carlo simulations to investigate superconductivity in a three-leg Hubbard ladder, confirming the persistence of pairing correlations across different interaction strengths, supporting theoretical predictions.

Contribution

It provides the first numerical evidence that pairing correlations predicted by weak-coupling theory persist at intermediate interactions in the three-leg Hubbard ladder.

Findings

Pairing correlations across the ladder persist at intermediate interactions.

Enhanced correlation for pairing between central and edge chains confirmed.

Supports coexistence of gapful and gapless spin modes in superconductivity.

Abstract

Quantum Monte Carlo method is used to look into the superconductivity in the three-leg Hubbard ladder. The enhanced correlation for the pairing across the central and edge chains, which has been predicted in the weak-coupling renormalization as an effect of coexistence of gapful and gapless spin modes, is here shown to persist for intermediate interaction strengths.