Isotropic crystal and energy band


by hokhani
Tags: band, crystal, energy, isotropic
hokhani
hokhani is offline
#1
Nov9-13, 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?
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DrDu
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#2
Nov9-13, 09:21 AM
Sci Advisor
P: 3,378
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
hokhani is offline
#3
Nov11-13, 05:38 PM
P: 241
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
DrDu is offline
#4
Nov12-13, 01:10 AM
Sci Advisor
P: 3,378

Isotropic crystal and energy band


Yes, indeed.


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