Electronic band structure from quasiparticle interference and Landau quantization in WTe$_2$

TL;DR

This study combines STM quasiparticle interference, Landau quantization observations, and DFT calculations to elucidate the electronic band structure of WTe₂, a semimetal with notable quantum oscillations.

Contribution

It provides a detailed experimental and theoretical analysis of WTe₂'s band structure, especially around the Fermi level, using advanced microscopy and computational methods.

Findings

Identification of electron and hole bands near the Fermi level

Observation of Landau quantization in STM measurements

Correlation between Landau levels and band structure calculations

Abstract

WTe$_2$ stands out as a semimetal presenting Fermi level quantum oscillations in most measured quantities under magnetic fields. However, the electronic band structure above and below the Fermi level has not been explored completely. Here we study the electronic band structure of WTe$_2$ by quasiparticle interference with Scanning Tunneling Microscopy (STM) and observe, with the support of Density Functional Theory (DFT), the electron and hole bands around the Fermi level. We also report on the observation of Landau quantization in atomically resolved measurements and discuss the possible connection with band structure calculations.