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Strain engineering of hyperbolic plasmons in monolayer carbon phosphide: a first-principles study
Mahyar Dehdast1, Mehdi Neek-Amal2,3, Catherine Stampfl4
1School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran 14395-515, Iran. pourfath@ut.ac.ir.
Nanoscale
|January 11, 2023
Summary
Researchers discovered tunable in-plane hyperbolic plasmons in strained carbon phosphide (β-CP). This novel two-dimensional (2D) material exhibits an ultra-wide hyperbolic window and tunable optoelectronic properties for advanced flat optics applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Natural and tunable in-plane hyperbolic plasmons are rare in two-dimensional (2D) materials.
- Discovering new 2D hyperbolic materials is crucial for advanced optoelectronics.
Purpose of the Study:
- To investigate the electronic and plasmonic properties of biaxially strained monolayer carbon phosphide (β-CP).
- To explore the potential of β-CP for tunable hyperbolic plasmons and anisotropic light control.
Main Methods:
- Comprehensive first-principles calculations were employed.
- Electronic band structures and plasmonic responses were analyzed under biaxial strain.
Main Results:
- Compressed β-CP exhibits anisotropic Dirac fermions with modulated Fermi velocity.
- An ultra-wide hyperbolic window (9 THz to 693 THz) was achieved with -3% biaxial strain.
- Tunable optical Van Hove singularity, elliptic to hyperbolic transition, and controlled wavefront propagation were demonstrated.
Conclusions:
- Strained β-CP offers tunable hyperbolic plasmons originating from the optical Van Hove singularity.
- This 2D material shows promise for anisotropic light control in flat optics due to its exotic optoelectronic characteristics.
