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Isotropic crystal and energy band

by hokhani
Tags: band, crystal, energy, isotropic
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hokhani
#1
Nov9-13, 04:40 AM
P: 265
Since all the directions are equivalent in an isotropic crystal, can we deduce that the energy band is exactly spherical?
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DrDu
#2
Nov9-13, 09:21 AM
Sci Advisor
P: 3,555
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.
hokhani
#3
Nov11-13, 05:38 PM
P: 265
Quote Quote by DrDu View Post
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.
Do you mean that using the isotropic approximation we in fact disregard the crystal?

DrDu
#4
Nov12-13, 01:10 AM
Sci Advisor
P: 3,555
Isotropic crystal and energy band

Yes, indeed.


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