Tomographic mapping of the hidden dimension in quasi-particle interference

Area of Science:

• Condensed Matter Physics
• Materials Science
• Surface Science

Background:

• Quasiparticle interference (QPI) imaging excels at probing low-energy electronic structures in correlated materials with high energy resolution.
• Traditionally, QPI interpretation relies on surface-sensitive analysis, primarily for anisotropic materials with quasi-2D electronic structures.

Purpose of the Study:

• To investigate the applicability of QPI imaging to non-anisotropic materials, specifically galena.
• To develop a theoretical framework for interpreting QPI signals from 3D electronic structures.

Main Methods:

• Utilized QPI imaging to study the electronic structure of galena.
• Developed a novel theoretical formalism to describe QPI signals from 3D electronic structures.
• Analyzed bias-dependent scattering vectors within the 3D electronic structure.

Main Results:

• Demonstrated that QPI signals in non-anisotropic materials like galena are influenced by 3D electronic structure.
• Identified scattering vectors parallel to the surface plane originating from bias-dependent 3D electronic structure.
• Established a method for quasiparticle tomography to extract 3D electronic structure information.

Conclusions:

• QPI imaging can be extended to elucidate the 3D electronic structure of non-anisotropic materials.
• The developed formalism enables detailed analysis of quasiparticle interference for comprehensive electronic structure characterization.
• This approach provides insights into the orbital character of electronic bands in 3D systems.