Competition Between Charge-Density Waves and Superconductivity in Striped Systems

TL;DR

This paper demonstrates that a specific period 4 stripe modulation can reverse the typical dominance of charge-density waves over superconductivity in strongly interacting one-dimensional systems, leading to high-temperature superconductivity even with repulsive interactions.

Contribution

It introduces a novel stripe modulation that promotes superconductivity over charge-density waves in strongly correlated systems.

Findings

Stripe modulation favors superconductivity in repulsive systems.

Superconducting state achieved with relatively high transition temperature.

Charge-density wave dominance can be reversed by structural modulation.

Abstract

Switching on interchain coupling in a system of one-dimensional strongly interacting chains often leads to an ordered state. Quite generally, there is a competition between an insulating charge-density-wave and a superconducting state. In the case of repulsive interactions, charge-density wave usually wins over superconductivity. Here, we show that a suitable modulation in the form of a period 4 bond-centered stripe can reverse this balance even in the repulsive case and produce a superconducting state with relatively high temperature.