The electrons that are missing have a negative effective mass.
So the holes have a positive effective mass.
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mass
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it is the mass of an electron in the presence of an electric or
magnetic field.
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A hole, by definition, has nothing in it and so its mass is
zero.
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Effective mass, or m*, is the mass that a compound seems to have
when responding to external forces. Determination of the effective
mass is usually done via cyclotron resonance.