Band structures of strained Kagome lattices

TL;DR

This paper investigates how uniaxial strain affects the electronic band structures of kagome lattices, revealing Dirac point movement and anisotropic flat band deformation, which could enable band structure engineering through mechanical strain.

Contribution

It introduces a theoretical analysis of strain effects on kagome lattice band structures using tight-binding and antidot models, highlighting the tunability of Dirac points and flat bands.

Findings

Dirac points shift with applied strain

Flat band becomes anisotropic under stretching

Potential for engineering electronic properties via strain

Abstract

Materials with kagome lattice have attracted significant research attention due to their nontrivial features in energy bands. In this work, we theoretically investigate the evolution of electronic band structures of kagome lattice in response to uniaxial strain using both a tight-binding model and an antidot model based on a periodic muffin-tin potential. It is found that the Dirac points move with applied strain. Furthermore, the flat band of unstrained kagome lattice is found to develop into a highly anisotropic shape under a stretching strain along y direction, forming a partially flat band with a region dispersionless along ky direction while dispersive along kx direction. Our results shed light on the possibility of engineering the electronic band structures of kagome materials by mechanical strain.