Postings for "ziman": one electron dynamics of a band electron

• 9.1 -- 5/30/97 -- Use of "negative anisotropy"
  

  In playing with "ziman" I accidentally plugged in a negative value for the anisotropy constant, A. Remarkably, the program didn't crash! Use of a negative A puts a saddle point instead of a minimum at the origin of E(k). The electron dynamics happen to work fine. Unfortunately the program doesn't draw the energy contours for negative values of E. (On the list for the first revision.)
  -------RHS