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Q: Limitation of Static lattice mode? |
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Answer» • The free electron model was refined by introducing a crystalline EXTERNAL POTENTIAL .• This allows much progress, but is not the full story • Ions are not INFINITELY massive, nor held in place by infinitely STRONG forces • The classical static lattice can only be valid for T=0K • It is even wrong for T=0K: ∆x∆p ≥ ¯h ⇒ Zero point motion • This is a particular problem for insulators: UNLESS kBT > Eg there are no degrees of freedom to account for their many propertiesHOPE IT WILL HELP YOU |
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