Banca de DEFESA: LEONARDO DE QUEIROZ DANTAS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : LEONARDO DE QUEIROZ DANTAS
DATE: 24/03/2025
TIME: 14:00
LOCAL: Plataforma Google Meet
TITLE:

Magnon-polaritons in Gyromagnetic Structures with Graphene

KEY WORDS:

Magnon-polaritons, gyromagnetic materials, graphene.

PAGES: 91
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

Electromagnetic waves propagating in magnetic crystals can couple with spin waves (magnons) excited in these materials,
giving rise to hybrid modes known as magnonpolaritons. These modes have been extensively studied in various materials and
geometries due to their potential for technological applications in devices operating from the microwave range to the far-
infrared. Recent studies have shown that the introduction of additional layers, particularly graphene, can significantly modify
the response of these systems, especially under the influence of a static magnetic field with a specific orientation. In particular,
when the field is applied perpendicularly, it excites the Landau levels of electrons in graphene, altering its conductivity and,
consequently, the dynamics of the polaritons at the interface between media. In this work, we present a theoretical study of
magnon-polaritons in three distinct systems: a semi-infinite medium, a thin film, and a periodic superlattice. All structures are
composed of gyromagnetic materials, each containing a single graphene layer at its interfaces, under the application of a
perpendicular magnetic field. Our results reveal the emergence of new hybrid modes that are highly sensitive to tunable
parameters, such as the magnetic field intensity and the Fermi energy of electrons in graphene.

 

COMMITTEE MEMBERS:
Externo à Instituição - CARLOS HUMBERTO OLIVEIRA COSTA - UFC
Interno - 1345774 - CLAUDIONOR GOMES BEZERRA
Interno - 2411793 - LEONARDO DANTAS MACHADO
Presidente - 1354851 - MANOEL SILVA DE VASCONCELOS
Externo à Instituição - VAMBERTO DIAS DE MELLO - UERN