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On the Spin Wave and Exciton Density of States in an Antiferrornagnet
Author(s) -
Baryakhtar V. G.,
Petrov E. G.
Publication year - 1972
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.2220510245
Subject(s) - exciton , gravitational singularity , condensed matter physics , brillouin zone , singularity , magnon , density of states , physics , van hove singularity , spin (aerodynamics) , quantum mechanics , geometry , mathematics , ferromagnetism , fermi level , thermodynamics , electron
The singularities in the spin wave and exciton density of states are considered. It is shown that the strongest singularity in the magnon density of states g (ω) has the form g (ω) ∼ |ω – ω c | −½ . This singularity is due to the constant‐energy surface. The strongest singularities in the exciton state density are observed for wave vectors which lie on the straight lines directed from the centre of the first Brillouin zone to the centres of its hexagonal faces.