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Multiple harmonics control of edge pseudomagnetoplasmons in strained grapheme
Optics Express
|January 16, 2019
Summary
Researchers tuned valley polarization in graphene edge plasmons using THz-frequency harmonics. This control over edge plasmon properties opens new avenues for tunable nano-optics and optoelectronics.
Area of Science:
- Condensed Matter Physics
- Nano-optics
- Graphene Physics
Background:
- Valley-resolved edge plasmons are crucial for subwavelength nano-optics.
- Their tunable properties in the time domain remain underexplored.
Purpose of the Study:
- Investigate tunable edge pseudomagnetoplasmons in strained graphene.
- Explore modulation by multiple harmonics in the THz regime.
Main Methods:
- Utilized nonlinear hydrodynamic equations for edge plasmon description.
- Employed the flux-corrected transport method for self-consistent solutions.
- Analyzed edge plasmons in strained graphene modulated by THz harmonics.
Main Results:
- Identified two unidirectional edge-plasmon modes with weak valley polarization without applied voltage.
- Demonstrated control over edge plasmon amplitude and valley polarization polarity by varying harmonic amplitudes.
- Achieved full valley polarization (P=1 and P=-1) at specific harmonic cycle instants.
- Observed vanishing edge-plasmon density and transverse velocity for the frozen valley.
Conclusions:
- The study successfully demonstrates time-domain tunability of valley polarization in graphene edge plasmons.
- Modulation by multiple THz harmonics offers precise control over edge plasmon characteristics.
- Potential applications in tunable nano-optics and optoelectronic devices.
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