10 papers
Suppressed plasmon excitations, enhanced damping and static screening in Kek-Y strained model
Jean Marseille, Teresa Lee, Andrii Iurov +3
We performed a rigorous theoretical and numerical investigation into the polarization function, plasmon excitations, and plasmon damping in the Kek- model, a two-dimensional ma…
Surface Response, Plasma Modes of coated Multi-Layered anisotropic Semi-Dirac Heterostructures
Teresa Lee, Godfrey Gumbs, Thi Nga Do +2
We derived closed-form analytical expressions for the surface response functions (SRFs) for heterostructure. We investigate structures consisting of up to three layered, coated het…
Exploring stable long-lifetime plasmon excitations in the Lieb lattice
Andrii Iurov, Liubov Zhemchuzhna, Godfrey Gumbs +1
The subject of the present paper is a thorough numerical investigation of plasmon expectations, their dispersions and damping within a Lieb lattice. The Lieb lattice is known for i…
Floquet Control of Electron and Exciton Transport in Kekulé-Distorted Graphene
Sita Kandel, Godfrey Gumbs
This work investigates the Floquet dynamics of electrons and excitons (particle-hole pairs) in a Dirac material referred to as Kekulé-distorted graphene. Specifically, we examine…
Theory of two-component superfluidity of microcavity polaritons
A. Nafis Arafat, Oleg L. Berman, Godfrey Gumbs +1
We develop a microscopic mean-field theory describing the coexistence of Bose-Einstein condensates of upper and lower polaritons (UP/LP) in a semiconductor microcavity. Incorporati…
Quantum Hall Effect and Chern Phases in the 1/5-Depleted Square Lattice
Sara Aghtouman, Godfrey Gumbs, Mir Vahid Hosseini
We investigate the fractional energy spectrum and quantum Hall response of a two-dimensional 1/5-depleted square lattice subjected to a perpendicular magnetic field. Using a tight-…