布里渊区内能带E(k)=E(-k)的对称性

THE SYMMETRY E(k)=E(-k) IN THE BRILLOUIN ZONE

说明了布里渊区内能带Ｅ（ｋ）＝Ｅ（－ｋ）的对称性是时间反演对称性的结果，而与晶体的空间对称性无关．并且证明了当晶体具有中心反演对称性时，布里渊区内能带是二重简并的．

It is shown that the inverse symmetry E(k)=E(-k) in the Brillouin zone is the consequence of time-reversal symmetry, and also that the electron states are doubly degenerated in the Brillouin zone when the crystal have the center inverse symmetry.