Nonlocal electrodynamics of two-dimensional anisotropic magnetoplasmons

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Mechanics

Background:

• Collective electronic motion in anisotropic materials is crucial for advanced electronic devices.
• Existing models often overlook nonlocal and quantum effects, limiting their accuracy.
• Anisotropic 2D materials like phosphorene and black phosphorus exhibit unique electronic properties.

Purpose of the Study:

• To develop a hydrodynamic model incorporating nonlocal and quantum effects for electronic motion in anisotropic materials.
• To derive analytical expressions for magnetoplasmon dispersion and nonlocal optical conductivity.
• To investigate the plasmonic properties of monolayer phosphorene and few-layer black phosphorus.

Main Methods:

• Utilized Madelung's formalism as the foundation for the hydrodynamic model.
• Incorporated nonlocal Thomas-Fermi quantum pressure and Bohm potential effects.
• Applied the model to analyze monolayer phosphorene and few-layer black phosphorus.

Main Results:

• The hydrodynamic model accurately predicts plasmon dispersion in monolayer phosphorene, aligning with ab initio calculations.
• Nonlocal and quantum effects in optical conductivity were found to inhibit hyperbolic surface plasmon polaritons in few-layer black phosphorus.
• Significant differences were observed in wavefront generation between local and nonlocal descriptions of optical conductivity.

Conclusions:

• The developed hydrodynamic model provides a robust framework for studying electronic motion in anisotropic materials.
• Nonlocal effects are essential for accurately describing plasmonic behavior in materials like black phosphorus.
• Moving beyond local approximations is critical for understanding and designing systems with strongly confined plasmon-polaritons.