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Effective mass

  1. Feb 13, 2013 #1
    I have got confused about electron effective mass in crystals. Which of the definitions below are correct?

    1) When an electron is in a crystal with periodic potential, it behaves such as a free electron with effective mass [itex]m^*[/itex]

    2) when an external force is applied on the electron in a crystal, the electron behaves such as a free electron with effective mass [itex]m^*[/itex]
  2. jcsd
  3. Feb 13, 2013 #2

    Simon Bridge

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    But these are pretty much identical statements - they are both sloppy statements of the same definition.
    The first one fails to state what it means by "behavior" while the second implies F=ma ... the actual definition uses the quantum mechanical analogy to F=ma.
    Last edited: Feb 13, 2013
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