# Fermi energy in metals approximately doubling

Between Cs and Na, the fermi energy in metal approximately doubles. why doesn't the carrier concentration also double?

Why would you expect to double?
The free electron concentration is not proportional to the Fermi level.
In the free electron approximation the Fermi energy goes like n^(2/3) where n is the free electron concentration.
n for sodium is about 2.65 and for Cs about 0.91 (from Ascroft and Mermin) . In same units, 10^22/cm^3, for example.
If you take the ratio of the concentrations and raise it to power 2/3 you get 2 Much better that I expected to work. :)

Why would you expect to double?
The free electron concentration is not proportional to the Fermi level.
In the free electron approximation the Fermi energy goes like n^(2/3) where n is the free electron concentration.
n for sodium is about 2.65 and for Cs about 0.91 (from Ascroft and Mermin) . In same units, 10^22/cm^3, for example.
If you take the ratio of the concentrations and raise it to power 2/3 you get 2 Much better that I expected to work. :)

Thanks nasu :)