设晶格常数为a的一维晶格,导带极小值附近能量E(k)和价带极大值附近能量E(k)分别为:https://bgk-photo.cdn.bcebos.com/6c224f4a20a446239fb105038822720e0cf3d75c.jpghttps://bgk-photo.cdn.bcebos.com/eaf81a4c510fd9f97e6cf508352dd42a2834a45c.jpghttps://bgk-photo.cdn.bcebos.com/3bf33a87e950352a7c1a85694343fbf2b2118b5c.jpghttps://bgk-photo.cdn.bcebos.com/d043ad4bd11373f0cb23cffeb40f4bfbfbed04b6.jpg(1)禁带宽度;(2)导带底电子有效质量;(3)价带顶电子有效质量;(4)价带顶电子跃迁到导带底时准动量的变化⏺