Electronic Resource
Springer
Journal of low temperature physics
121 (2000), S. 327-332
ISSN:
1573-7357
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The dynamic structure factor S( $${\vec q}$$ , ω) of 4 He is studied at zero temperature in the momentum region at and above the roton minimum by field-theoretical methods. The model is derived from the Gavoret-Nozières (GN) two particle propagator by introducing the concept of quasiparticles. In this way a connection between the field theory of GN and the phenomenological models of Zawadowski-Ruvalds-Solana (ZRS) type is obtained. An improved expression for the dynamic structure factor within ZRS-like models is found. Numerical results for S( $${\vec q}$$ , ω) are presented for momentum and energy independent effective interactions between quasiparticles.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1017529108783
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