每年出版 12 期
ISSN 打印: 0040-2508
ISSN 在线: 1943-6009
Indexed in
Quantization of Group Velocity of Surface Polaritons in a Finite Superlattice in a High Magnetic Field
摘要
The paper is aimed at theoretically investigating surface polaritons (SP) in a superlattice (SL) consisting of a finite number of equally spaced infinite-size two-dimensional electronic layers (2DELs). The finite-size SL is located in a quantizing magnetostatic field oriented along the SL axis. Two cases are considered, namely, of the equal and different dielectric constants, interior, ε, and outside, ε1 of the SL It is shown that in the case of the integer-valued quantum Hall effect all the characteristics of the SP are quantum values. It has been found that the group velocity of surface polaritons in the vicinity of cyclotron resonances is a step-wise function of the magnetic field strength. The jump magnitude depends on the fine-structure constant, α layer separation, d, and values of ε and ε1,. The influence of the dissipation effects in the two-dimensional electronic layer upon the spectrum and the attenuation factor of the surface polaritons is studied. A new surface polariton mode has been discovered. This represents an additional surface polariton of dissipative nature, whose properties depend strongly upon the relaxation frequency, ν, of the electron momentum.