
#1
Nov913, 04:40 AM

P: 241

Since all the directions are equivalent in an isotropic crystal, can we deduce that the energy band is exactly spherical?




#2
Nov913, 09:21 AM

Sci Advisor
P: 3,368

The problem is that there are no isotropic crystals. Even cubic crystals are only symmetric with respect to four and threefold rotations about some special axes. However this is sufficient to render second order (but not higher order) tensors isotropic.




#3
Nov1113, 05:38 PM

P: 241





#4
Nov1213, 01:10 AM

Sci Advisor
P: 3,368

Isotropic crystal and energy band
Yes, indeed.



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