Multi-Branch Structure of the Excitation Spectra in Liquid Helium II
Open Access
- 1 June 1973
- journal article
- Published by Oxford University Press (OUP) in Progress of Theoretical Physics
- Vol. 49 (6) , 1802-1820
- https://doi.org/10.1143/ptp.49.1802
Abstract
The multi-branch structure of the excitation spectra in liquid helium II is clarified on the basis of the formulae from which the phonon-roton spectrum has been successfully derived in previous papers. The existence of the flat spectrum and the broad free-atom spectrum revealed by Cowley and Woods is confirmed theoretically. The new excitation spectrum with energy 40 °K at momentum 1.13Å-1 which has recently been found by Woods, Svensson and Martel is derived and an excellent agreement with experiment is obtained.Keywords
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