Collective excitations from condensed Fermi systems and the Goldstone theorem
- 1 January 1970
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 3 (1) , 50-58
- https://doi.org/10.1088/0022-3719/3/1/008
Abstract
By means of the two-particle Green function, the collective modes of a condensed Fermi system (i.e. a Fermi system with long-range order present) describable by means of a 2*2 matrix propagator are studied. The random phase approximation is given in terms of diagrams and is applied to a ferromagnetic state. Finally, the Goldstone theorem is shown to be an immediate consequence of the order-parameter equation.Keywords
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