禁带区域内负的群速度(英文)  

Negative Group Velocity in the Band Gap Range

作　　者：王玉林[1] 约翰.佩吉 迈克.寇温 

机构地区：[1]云南民族大学物理与电气信息工程学院,云南昆明650031 [2]曼尼托巴大学物理系

出　　处：《云南民族大学学报（自然科学版）》2005年第4期301-304,共4页Journal of Yunnan Minzu University:Natural Sciences Edition

摘　　要：研究超声波经过两个烧结样品的行为.两个烧结样品为有序的面心立方结构,它们的结构几乎相同.研究表明:在两个有序的准均匀的介质中分别有一个禁带区域.就禁带区域而言,在两个样品中产生禁带的区域非常接近.同时在禁带出现的区域群速度为负值.我们的结果表明群速度的负值的确存在于有序介质中的禁带区域内.Investigation of the ballistic propagation of acoustic wave through two almost same sintered samples with face - centered cubic lattices indicates that there is a band gap range respectively in two order quasi - homogeneous media. As far as band gap range is concerned, the range in the two samples is very close. Meanwhile group veloeity is negative in the presence of the band gap range. Our results suggest that the negative group velocity does exist different formation with band gap range.

关 键 词：超声波 面心立方结构 禁带 群速度 

分 类 号：O481.1[理学—固体物理]