Abstract
We study the effects of the particle-hole asymmetry terms contained in the Landau-Silin equations on the collective modes of normal . We find that there are no frequency shifts, first order in particle-hole asymmetry terms, of either the zero sound mode or the spin wave modes of normal . Propagating spin waves cannot be excited by zero sound; but, because of particle-hole asymmetry, zero sound can drive small magnetic oscillations with frequencies (ω zero sound±) in the combined pulsed-NMR and zero sound experiment proposed by Ketterson.
- Received 16 July 1984
DOI:https://doi.org/10.1103/PhysRevB.31.251
©1985 American Physical Society