arXiv subjects

Eddy Timmermans

Publications and source records attributed to Eddy Timmermans.

38 records · Page 3Linked to original sources

arXiv1997

Resonant Light Scattering to Measure BEC-Pairing

We present a single-scattering formalism for incoherent resonant light scattering by dilute quantum gas systems such as the atomic-trap Bose-Einstein condensates. We show that resonant scattering gives access to more information than the dynamical structure factor, familiar from non-resonant scattering. In particular, we show that the detuning dependence of the incoherent scattering cross-section allows the direct determination of the BEC pairing density $< ψψ>$, which is a broken symmetry and provides evidence that the condensate is not in a good number state.

cond-mat↗

arXiv1997

Quasi-Homogeneous Dynamical Structure Factor for Atomic-Trap Bose Condensates

The essence of the Thomas-Fermi model is the assumption that the local behavior of a many-body system can be approximated by that of a homogeneous system. In this paper, we present the natural extension of the static Thomas-Fermi treatment of dilute Bose condensates, by describing the dynamical behavior of the condensate in the same quasi-homogeneous approximation. In particular, we calculate the dynamical structure factor $S(q, ω)$ of a low-temperature condensate, confined in a harmonic oscillator trap. The result is a remarkably simple analytical function, which, with the proper interpretation, gives a powerful and insightful description of the scattering properties of the BEC-system.

cond-mat↗