Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2010-08-07
European Journal of Physics, 31 (2010) L89
Physics
Condensed Matter
Statistical Mechanics
To appear in European Journal of Physics (2010)
Scientific paper
10.1088/0143-0807/31/6/L01
Usually, we study the statistical behaviours of noninteracting Fermions in finite (mainly two and three) dimensions. For a fixed number of fermions, the average energy per fermion is calculated in two and in three dimensions and it becomes equal to 50 and 60 per cent of the fermi energy respectively. However, in the higher dimensions this percentage increases as the dimensionality increases and in infinite dimensions it becomes 100 per cent. This is an intersting result, at least pedagogically. Which implies all fermions are moving with Fermi momentum. This result is not yet discussed in standard text books of quantum statistics. In this paper, this fact is discussed and explained. I hope, this article will be helpful for graduate students to study the behaviours of free fermions in generalised dimensionality.
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