Electric-field-induced plasmon in AA-stacked bilayer graphene

Journal Article · Sun Dec 15 04:00:00 EST 2013 · Annals of Physics (New York)

DOI:https://doi.org/10.1016/J.AOP.2013.09.002· OSTI ID:22224258

The collective excitations in AA-stacked bilayer graphene for a perpendicular electric field are investigated analytically within the tight-binding model and the random-phase approximation. Such a field destroys the uniform probability distribution of the four sublattices. This drives a symmetry breaking between the intralayer and interlayer polarization intensities from the intrapair band excitations. A field-induced acoustic plasmon thus emerges in addition to the strongly field-tunable intrinsic acoustic and optical plasmons. At long wavelengths, the three modes show different dispersions and field dependence. The definite physical mechanism of the electrically inducible and tunable mode can be expected to also be present in other AA-stacked few-layer graphenes. -- Highlights: •The analytical derivations are performed by the tight-binding model. •An electric field drives the non-uniformity of the charge distribution. •A symmetry breaking between the intralayer and interlayer polarizations is illustrated. •An extra plasmon emerges besides two intrinsic modes in AA-stacked bilayer graphene. •The mechanism of a field-induced mode is present in AA-stacked few-layer graphenes.

• OSTI ID: 22224258
• Journal Information: Annals of Physics (New York), Journal Name: Annals of Physics (New York) Vol. 339; ISSN APNYA6; ISSN 0003-4916
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGE DISTRIBUTION
COLLECTIVE EXCITATIONS
DISPERSIONS
DISTRIBUTION
ELECTRIC FIELDS
GRAPHENE
LAYERS
PLASMONS
POLARIZATION
PROBABILITY
RANDOM PHASE APPROXIMATION
SYMMETRY BREAKING
WAVELENGTHS