Physics for Electrical Engineering: Unit II: a. Electrical Properties of Materials
Fermi-Dirac Statistics
Definition | Electrical Properties of Materials
Fermi - Dirac statistics deals with the particles having half integral spin like electrons. They are known as Fermi particles or Fermions
FERMI-DIRAC
STATISTICS
Fermi
- Dirac statistics deals with the particles having half integral spin like
electrons. They are known as Fermi
particles or Fermions
Definition
Fermi distribution function gives
the distribution of electrons among the various energy levels as a function of
temperature.
It is a probability function F(E)
of an electron occupancy for a given energy level at absolute temperature.
It
is given by
where
E
- Energy of the level whose occupancy is being considered unsupal
EF-Fermi
energy level
K
- Boltzmann's constant
T-
Absolute temperature
The
probability value F(E) lies between 0 and 1.
•
If F (E) = 1, the energy level is occupied by an electron.
•
If F (E) = 0, the energy level is vacant ie., it is not occupied by the
electron.
• If F (E) = 0.5 or ½ then there is a 50% chance for theelectron occupying in that energy level.
Physics for Electrical Engineering: Unit II: a. Electrical Properties of Materials : Tag: : Definition | Electrical Properties of Materials - Fermi-Dirac Statistics
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Physics for Electrical Engineering
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