Chinese Journal of Quantum Electronics ›› 2022, Vol. 39 ›› Issue (4): 541-548.doi: 10.3969/j.issn.1007-5461.2022.04.008

• Basic Optics • Previous Articles     Next Articles

Correction of plasmon dispersion relation due to thickness of monolayer-atom system

WU Renglai1∗, YU Yabin2, XIAO Shifa3, QUAN Jun3   

  1. ( 1 School of Electronic Information and Electrical Engineering, Huizhou University, Huizhou 516007, China; 2 School of Physics & Electronics, Hunan University, Changsha 410082, China; 3 School of Physics Science & Technology, Lingnan Normal University, Zhanjiang 524048, China )
  • Received:2021-05-06 Revised:2021-05-18 Published:2022-07-28 Online:2022-07-28

Abstract: Based on the free electron gas model, the plasmon frequency of a monolayer-atom system is solved by using the linear response theory and the Green function method, and the analytic expression for the plasmon dispersion, which can be applied to high electron density and short wavelength cases, is obtained. The results show that the thickness of the atomic layer can reduce the plasmon frequency. The thicker the atom layer is, the smaller the plasmon frequency will be, and this reduction is more obvious when the wave vector is larger. When the thickness of the monolayer-atom system tends to zero, the plasmon dispersion of the monolayer-atom system tends to that of a pure two dimensional system. In addition, in the first-order approximation of the plasmon frequency in monolayer-atom system, it is found that the relative correction of the plasmon frequency in the case of long-wave approximation is linearly related to the wave vector and the thickness of the atomic layer.

Key words: optoelectronics, plasmon, linear response theory, Green function method, monolayer-atom system

CLC Number: