Polarization potentials and elementary excitations in He II at low temperatures
Journal Article
·
· J. Low Temp. Phys.; (United States)
The density fluctuation excitation spectrum of He II is calculated using a generalized polarization potential approach and shown to yield a phonon-roton spectrum for wave vectors less than 2.1 A/sup -1/ in excellent quantitative agreement with that observed in neutron scattering experiments for pressures ranging from SVP to approximately 25 bar. The model provides a simple physical explanation for the increase in maxon energy and decrease in roton energy with increasing pressure, and a quantitative account of the pressure variation of the single-phonon energy and, probability amplitude in the vicinity of the roton minimum (1.8 less than or equal to q less than or equal to 2.1 A/sup -1/).
- Research Organization:
- Univ. of Illinois, Urbana
- OSTI ID:
- 7327589
- Journal Information:
- J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 25:5/6; ISSN JLTPA
- Country of Publication:
- United States
- Language:
- English
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