Observation of Zero-Sound at Atomic Wave-Vectors in a Monolayer of Liqu3He
Sprache des Titels:
Englisch
Original Kurzfassung:
Abstract = {{The elementary excitations of a strongly interacting two-dimensio-
nal Fermi liquid have been investigated by inelastic neutron scattering in
an experimental model system: a monolayer of liquid $^3$He adsorbed on
graphite preplated by a monolayer of solid (4)He. We observed for the
first time the particle-hole excitations characterizing the Fermi liquid
state of two-dimensional liquid 3He, and we were also able to identify
the highly interesting zero-sound collective mode above a particle-hole
band. Contrarily to bulk $^3$He, at low wave-vectors this mode lies very
close to the particle-hole band. At intermediate wave-vectors, the
collective mode enters the particle-hole band, where it is strongly
broadened by Landau damping. At high wave-vectors, where the Landau
theory is not applicable, the zero-sound collective mode reappears
beyond the particle-hole band as a well defined excitation, with a
dispersion relation quite similar to that of superfluid (4)He. This
spectacular effect is observed for the first time in a Fermi liquid
(including plasmon excitations in electronic systems).}}
Sprache der Kurzfassung:
Englisch
Journal:
Journal of Low Temperature Physics
Veröffentlicher:
Springer
Volume:
158
Number:
1-2, Sp. Iss. SI
Seitenreferenz:
147-154
Erscheinungsmonat:
1
Erscheinungsjahr:
2010
ISSN:
1573-7357
Anzahl der Seiten:
8
Notiz zur Publikation:
17th International Conference on Quantum Fluids and Solids, Evanston, IL, AUG 05-11, 2009
Forschungs-