Band structures of plasmonic polarons

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Chemistry

Background:

• Electron-plasmon interactions are fundamental in solids.
• Understanding their impact on electronic band structures is crucial for materials design.
• Previous studies have not fully elucidated the emergence of specific band structures due to these interactions.

Purpose of the Study:

• To investigate the emergence of plasmonic polaron bands in semiconductors.
• To demonstrate the generality of these bands across different material systems.
• To establish criteria for their experimental observation.

Main Methods:

• Utilizing advanced many-body calculations, specifically the GW plus cumulant approach.
• Employing silicon and group IV transition-metal dichalcogenide monolayers (AX$_{2}$, A=Mo,W; X=S,Se) as model systems.
• Analyzing energy-momentum dispersion relations and spectral features.

Main Results:

• Electron-plasmon interactions lead to the formation of plasmonic polaron bands.
• These bands are a general feature in materials with distinct plasmon resonances.
• The new bands closely resemble valence bands but are broadened and blueshifted.

Conclusions:

• Plasmonic polaron bands are a significant consequence of electron-plasmon coupling in semiconductors.
• Experimental observation is feasible in angle-resolved photoelectron spectroscopy.
• This finding advances the understanding of electronic properties in correlated electron systems.