Correlated physics in an artificial triangular anti-dot lattice

TL;DR

This paper investigates a two-dimensional artificial triangular anti-dot lattice, revealing the presence of flat bands and potential correlated phases, with a focus on how doping influences the emergence of strongly correlated states.

Contribution

It demonstrates the generation of flat bands in a TAL and explores the correlated phases using strong and weak Coulomb interaction theories, highlighting advantages of hole doping.

Findings

Flatbands are generated when charges align along a kagome lattice.

Hole-doped TALs are more effective in producing strongly correlated phases.

The study uses complementary strong and weak interaction techniques.

Abstract

This work considers a two-dimensional artificial triangular anti-dot lattice (TAL); a semiconductor based artificial crystal hosting Dirac cones, flat bands and Fermi surface nesting. All such single particle features have dramatic implications for the emergent correlated phases. This work predominantly focuses on the existence of a robust flatband and enumerates the possible correlated phases that follow. We find that the flatband is generated, in the single-particle theory, when charges align themselves along a kagome lattice with the same period as the TAL. The correlated phases are studied using complementary techniques of expansions in strong and weak Coulomb interaction. Our microscopic modelling shows that for the purpose of generating strongly correlated phases, hole doped TALs have significant advantages over electron doped.