Calculate the valence band effective density of states for Si, Ge, and GaAs at 300 K. Plot

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Calculate the valence band effective density of states for Si, Ge, and GaAs at 300 K. Plot it as a function of temperature in logarithmic scale. We know that the valence band is degenerate at the center of the Brillouin zone as there is a heavy-hole band (with effective mass mhh) and a light-hole band (with effective mass mhh). The effective mass to be used in Eq. (7.28) is then:

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