Structure factor of Bose fluid

Kapil M. Khanna, O.P. Sinha

Srećko Kilić

M. Saarela, Ferran Mazzanti, V. Apaja

Guillaume Lang, F. W. J. Hekking, Anna Minguzzi

We study the effect of thermal and quantum fluctuations on the dynamical response of a one-dimensional, strongly interacting Bose gas in a tight atomic waveguide. We combine the Luttinger liquid theory at arbitrary interactions and the exact Bose-Fermi mapping in the Tonks-Girardeau impenetrable-boson limit to obtain the dynamic structure factor of the strongly interacting fluid at finite temperature. Then we determine the drag force felt by a potential barrier moving along the fluid in the experimentally realistic situation of finite barrier width and temperature.

L. Reatto

B. Tanatar

We consider the generalization of Bijl-Feynman excitation energy formula to multi-component Bose fluids. Identification of these excitation energies with those obtained from the poles of the density-density response function simplifies the calculation of static structure factors Sij(q) . This in turn helps simplify the self-consistent calculations that go beyond the usual random-phase approximation. We illustrate our approach by evaluating the structure factors and local-field corrections in a double-layer charged Bose gas. © Tübi̇tak.