Atomic-Scale Visualization of Quasiparticle Interference on a Type-II Weyl Semimetal Surface

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Materials

Background:

• Type-II Weyl semimetals exhibit unique electronic properties due to their topological nature.
• Understanding surface states and their scattering is crucial for exploring exotic phenomena in these materials.

Purpose of the Study:

• To visualize quasiparticle interference patterns in Mo_{x}W_{1-x}Te_{2} for the first time.
• To theoretically reveal surface electron scattering behavior and identify topological Fermi arc states.
• To experimentally confirm topological signatures through bulk and surface state interconnectivity.

Main Methods:

• Quasiparticle interference simulation (theory) based on first-principles band topology.
• Atomic resolution scanning tunneling spectromicroscopy (experiment).

Main Results:

• First visualization of interference patterns on a type-II Weyl semimetal Mo_{x}W_{1-x}Te_{2}.
• Identification of topological Fermi arc states and their scattering properties in Mo_{0.66}W_{0.34}Te_{2}.
• Experimental evidence of topological signatures via bulk-surface state interconnectivity.

Conclusions:

• The study provides a comprehensive understanding of surface electron scattering in type-II Weyl semimetals.
• The findings are essential for elucidating the unusual electronic nature of Mo_{x}W_{1-x}Te_{2}.
• This work bridges theoretical predictions and experimental observations in topological materials.