Dispersion,attenuation,and bandgap of in-plane coupled Bloch waves in piezoelectric semiconductor phononic crystal with PN junction  

作　　者：Zibo WEI Peijun WEI Chunyu XU Xiao GUO 

机构地区：[1]Department of Applied Mechanics,University of Science and Technology Beijing,Beijing 100083,China [2]School of Mathematics and Physics,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2025年第5期813-830,共18页应用数学和力学(英文版)

基　　金：Project supported by the National Natural Science Foundation of China(Nos.11872105,12072022,11911530176,and 12202039)。

摘　　要：In this paper,the dispersion,attenuation,and bandgap characteristics of in-plane coupled Bloch waves in one-dimensional piezoelectric semiconductor(PSC)phononic crystals are investigated,emphasizing the influence of positive-negative(PN)junctions.Unlike piezoelectric phononic crystals,the coupled Bloch waves in PSC phononic crystals are attenuated due to their semiconductor properties,and thus the solution of Bloch waves becomes more complicated.The transfer matrix of the phononic crystal unit cell is obtained using the state transfer equation.By applying the Bloch theorem for periodic structures,the dispersion relation of the coupled Bloch waves is derived,and the dispersion,attenuation,and bandgap are obtained in the complex wave number domain.It is found that the influence of the PN junction cannot be neglected.Moreover,the effects of the PN junction under different apparent wave numbers and steady-state carrier concentrations are provided.This indicates the feasibility of adjusting the propagation characteristics of Bloch waves through the regulation of the PN heterojunction.

关 键 词：piezoelectric semiconductor(PSC) phononic crystal positive-negative(PN)junction dispersion and attenuation carrier field transfer matrix 

分 类 号：O472[理学—半导体物理]