Answered: 11. Fluctuations in a Fermi gas. Show… | bartleby

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11. Fluctuations in a Fermi gas. Show for a single orbital of a fermion system
that
((AN)?>
(N>(1 – (N>) ,
(91)
-
if (N) is the average number of fermions in that orbital. Notice that the
fluctuation vanishes for orbitals with energies deep enough below the Fermi
energy so that (N) = 1. By definition, AN = N
- (N).

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