Strongly direction-dependent magnetoplasmons in mixed Faraday-Voigt configurations

Area of Science:

• Condensed matter physics
• Plasma physics
• Electromagnetism

Background:

• Surface magnetoplasmons are crucial for understanding electromagnetic wave interactions in magnetized plasmas.
• Existing theories primarily focus on high-symmetry Faraday and Voigt configurations.

Purpose of the Study:

• To generalize the electrostatic theory of surface magnetoplasmons to mixed Faraday-Voigt configurations.
• To analyze the direction-dependent properties of these waves in narrow-gap semiconductors.
• To investigate the dispersion relation and velocity characteristics of these novel magnetoplasmons.

Main Methods:

• Generalization of electrostatic theory for surface magnetoplasmons.
• Analysis of dispersion relations under mixed magnetic field configurations.
• Investigation of group and phase velocity properties.

Main Results:

• A general dispersion relation for mixed Faraday-Voigt surface magnetoplasmons is derived.
• These waves exhibit strong direction-dependence and are realizable in narrow-gap semiconductors at THz frequencies.
• The group velocity is consistently perpendicular to the phase velocity, with detailed velocity and energy relations discussed.

Conclusions:

• The study successfully extends the theory of surface magnetoplasmons to more complex magnetic field configurations.
• The findings offer insights into novel wave phenomena in magnetized electron gases, relevant for semiconductor spintronics and THz technologies.
• The recovered known surface magnetoplasmons in limiting cases validate the generalized theory.