Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 7: Superconductivity & Solids At Low Temperature - Poster Session
TT 7.64: Poster
Montag, 27. März 2006, 14:00–17:45, P1
Study the dependence between the pair interaction potential in the Bose liquid 4He and and quasiparticle spectrum of superfluid 4He at T=0 — •Vitaliy Bardic and Stanislav Vilchynskyi — Kiev national Taras Shevchenko university
As well known the multiparticle collective effects in the Bose liquid lead to an essential renormalization of the pair interaction between atoms of superfluid helium. Self-consistent numerical calculations of the boson self-energy, polarization operator, pair order parameter, and quasiparticle spectrum of superfluid 4He at T=0, involving an iteration scheme with the single fitting parameter—the value of the repulsion potential at r=0, have allowed us to find conditions for the theoretical spectrum E(p) to coincide with the experimentally observed elementary excitation spectrum in 4He. It is shown that the roton minimum in the quasiparticle spectrum E(p), which corresponds to a maximum in the structural form-factor S(q) of a Bose liquid, is directly associated with the first negative minimum of the Fourier component of the renormalized potential V(p) of the pair interaction between bosons.