Progress made in measuring and interpreting the elementary excitations of superfluid and
normal liquid ${\hspace {0pt}}^ 4 {\rm He} $ in the past 25 years is reviewed. The goal is to …

This textbook covers the main topics in contemporary condensed matter physics in a modern
and unified way, using quantum field theory in the functional-integral approach. The book …

The Berezinskii-Kosterlitz-Thouless transition in two-dimensional dipolar systems has been
studied recently by path integral Monte Carlo simulations [A. Filinov, Phys. Rev. Lett. 105 …

We have carried out a microscopic study of the dynamic structure factor of liquid He 4 across
the normal-superfluid transition temperature using the path integral Monte Carlo method …

We present further progress in a systematic approach to the microscopic understanding of
the dynamics of strongly interacting quantum fluids. Employing the concept of dynamic …

We present neutron scattering measurements of the phonon-roton (PR) and layer modes of
liquid 4 He confined in MCM-41 under pressure up to 38 bar. The data shows …

We show, using inelastic neutron scattering, that liquid helium in porous media, two gelsils
and MCM-41, supports a phonon-roton mode up to a pressure of 36–37 bars only. Modes …

We present neutron scattering measurements of the phonon-roton (PR) mode of superfluid 4
He confined in 47 Å MCM-41 at T= 0.5 K at wave vectors, Q, beyond the roton wave vector …

Progress made in measuring and interpreting the elementary excitations of superfluid and
normal liquid\4he in the past 25 years is reviewed. The goal is to bring up to date the data …

L'étude des corrélations dans les fluides quantiques est abordée dans cette thèse par le
biais de mesures neutroniques de leurs excitations élémentaires. Nos recherches sont …