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Roger V.
Roger V.
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In Kittel`s book, it says "The band structure of a crystal can often be explained by the nearly free electron model for which the band electrons are treated as perturbed only weakly by the periodic potential of the ion cores.".

The band structure of a crystal can often be explained by the nearly free electron model for which the band electrons are treated as perturbed only weakly by the periodic potential of the ion cores."

Does this mean that in electron free model we neglected the potential of ion cores completely? Or is it opposite?

In Kittel`s book, it says "The band structure of a crystal can often be explained by the nearly free electron model for which the band electrons are treated as perturbed only weakly by the periodic potential of the ion cores.". Does this mean that in electron free model we neglected the potential of ion cores completely? Or is it opposite?

In Kittel`s book, it says

The band structure of a crystal can often be explained by the nearly free electron model for which the band electrons are treated as perturbed only weakly by the periodic potential of the ion cores."

Does this mean that in electron free model we neglected the potential of ion cores completely? Or is it opposite?

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user
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The difference between free electron model and nearly free electron model

In Kittel`s book, it says "The band structure of a crystal can often be explained by the nearly free electron model for which the band electrons are treated as perturbed only weakly by the periodic potential of the ion cores.". Does this mean that in electron free model we neglected the potential of ion cores completely? Or is it opposite?