
#1
Feb1313, 04:46 AM

P: 241

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
Feb1313, 06:31 AM

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PF Gold
P: 11,024

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. http://en.wikipedia.org/wiki/Effecti...cs)#Definition 


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