Helga Böhm, Robert Holler, Eckhard Krotscheck, Martin Panholzer,
"Dynamic many-body theory: Dynamics of strongly correlated Fermi fluids"
, in Physical Review B: Condensed Matter and Materials Physics, Vol. 82, Nummer 22, American Physical Society, Seite(n) 224505, 6-2010, ISSN: 2469-9969
Original Titel:
Dynamic many-body theory: Dynamics of strongly correlated Fermi fluids
Sprache des Titels:
Englisch
Original Kurzfassung:
Abstract = {{We develop a systematic theory of multiparticle excitations in
strongly interacting Fermi systems. Our work is the generalization of the
time-honored work by Jackson, Feenberg, and Campbell for bosons, that
provides, in its most advanced implementation, quantitative predictions
for the dynamic structure function in the whole experimentally
accessible energy/momentum regime. Our view is that the same physical
effects, namely, fluctuations of the wave function at an atomic length
scale are responsible for the correct energetics of the excitations in
both Bose and Fermi fluids. Besides a comprehensive derivation of the
fermion version of the theory and discussion of the approximations made,
we present results for homogeneous $^3$He and electrons in three
dimensions. We find indeed a significant lowering of the zero-sound mode
in $^3$He and a broadening of the collective mode due to the coupling to
two-particle-two-hole excitations in good agreement with experiments.
The most visible effect in electronic systems is the appearance of a
``double-plasmon{''} excitation.}}
Sprache der Kurzfassung:
Englisch
Journal:
Physical Review B: Condensed Matter and Materials Physics
Forschungs-