Premium
On the density of states at the fermi level for normal systems
Author(s) -
Behn U.,
Zinke H.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220840229
Subject(s) - density of states , fermi level , fermi gamma ray space telescope , condensed matter physics , physics , nearest neighbour , fermi gas , electron , quantum mechanics , artificial intelligence , computer science
Abstract In the single‐site and the nearest‐neighbour approximation, respectively, the density of electronic states at the Fermi level for normal systems at T = 0 is considered as a functional of the unperturbed density of states. For electron–hole symmetric systems, e.g. the half‐filled‐band Hubbard model, the density of states at the Fermi level in a normal single‐site approximation is either equal to the unperturbed value or vanishes. The expected gradual change in the density of states can be obtained in the nearest‐neighbour approximation.