Strain-induced collapse of Landau Levels in real Weyl semimetals

TL;DR

This paper investigates how strain can induce the collapse of Landau levels in Weyl semimetals, combining theoretical analysis with first-principles calculations to identify experimentally accessible conditions.

Contribution

It provides a detailed analysis of strain-induced Landau level collapse in realistic Weyl semimetals, specifically TaAs, using first-principles calculations.

Findings

Strain can induce collapse of Landau levels in Weyl semimetals.

Conditions for Landau level collapse are identified for TaAs.

First-principles calculations confirm experimental feasibility.

Abstract

The collapse of Landau levels under an electric field perpendicular to the magnetic field is one of the distinctive features of Dirac materials. So is the coupling of lattice deformations to the electronic degrees of freedom in the form of gauge fields which allows the formation of pseudo-Landau levels from strain. We analyze the collapse of Landau levels induced by strain on realistic Weyl semimetals hosting anisotropic, tilted Weyl cones in momentum space. We perform first-principles calculations, to establish the conditions on the external strain for the collapse of Landau levels in TaAs which can be experimentally accessed.