Magnetoplasmons in Graphene Structures
The dispersion relation for magnetoplasmon excitations in a single layer and a pair of parallel layers of graphene is calculated in the random-phase approximation. Our formalism is valid for integer filling factor. The graphene layers are embedded in a dielectric medium and a strong perpendicular quantizing ambient magnetic foeld is applied. We present numerical results for the for magnetplasmon excitation energies as a function of the in-plane wave vector. Our numerical calculations show that for a graphene layer, there is a collective mode which is not Landau damped by the particle-hole excitations. This magnetoplasmon has a negative as well as a positive group velocity for different ranges of wave vector at fixed magnetic field. For bilayer graphene, the magnetoplasmon mode is split by the inter-layer Coulomb interaction into a symmetric (in-phase) and antisymmetric (out-of-phase) oscillatory mode. A discussion of the plasmon instabilities associated with these layered structures is presented.
Oleg L.Berman Godfrey Gumbs Yurii E.Lozovik
Physics Department,New York City College of Technology,City University of New York,USA Department of Physics,Hunter College,City University of New York,USA Institute of Spectroscopy,Russian Academy of Sciences,Russia
国际会议
Progress in Electromagnetics Research Symposium 2008(2008年电磁学研究新进展学术研讨会)(PIERS 2008)
杭州
英文
1-5
2008-03-24（万方平台首次上网日期，不代表论文的发表时间）