High-momentum dynamic structure function of liquid He-He mixtures: A microscopic approach

A Microscopic Look at Liquid Helium: the He Impurity Case

The description of the properties of liquid Helium is a challenge for any microscopic many–body theory. In this context, we study the ground state and the excitation spectrum of one He impurity in liquid He at T = 0 with the aim of illustrating the power of the correlated basis function formalism in describing heavily correlated systems. The strong interatomic interaction and the large density ...

Microscopic and Macroscopic Studies of Liquid and Solid Helium Mixtures

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Juho Rysti Name of the doctoral dissertation Microscopic and Macroscopic Studies of Liquid and Solid Helium Mixtures Publisher School of Science Unit O.V. Lounasmaa Laboratory Series Aalto University publication series DOCTORAL DISSERTATIONS 110/2013 Field of research Engineering Physics, Physics Manuscript submitted 16 April ...

Momentum distributions and final-state effects in neutron scattering.

A method for analyzing neutron-scattering data at intermediate and high-momentum transfer in liquids and solids is proposed. The aim is to separate the observed dynamic structure factor, $(Q, co), into its impulse-approximation (IA) and final-state (FS) parts. When the separation is made, both the IA and FS effects can be determined from the data. The method is based on a cumulant expansion of ...

D ec 1 99 5 A microscopic approach to the response of 3 He - 4 He mixtures

Microscopic Connection between Bose-Einstein Condensation and the Two Fluid Model of Liquid 4He

It is shown that a function ) (r ψ of the position co-ordinate r can be defined in terms of the many particle Schrödinger wave function Ψ . It is shown that for the ideal Bose gas and correlated basis functions, ) (r ψ can be split into two parts in the presence of Bose Einstein condensation. One part, ) (r S ψ , is completely phase coherent over macroscopic length scales, while the other part,...