Dynamical structure factor of one-dimensional Bose gases: experimental signatures of beyond-Luttinger liquid physics
Abstract
Interactions are known to have dramatic effects on bosonic gases in one dimension (1D). Not only does the ground state transform from a condensate-like state to an effective Fermi sea, but new fundamental excitations, which do not have any higher-dimensional equivalents, are predicted to appear. In this work, we trace these elusive excitations via their effects on the dynamical structure factor of 1D strongly-interacting Bose gases at low temperature. An array of 1D Bose gases is obtained by loading a Rb condensate in a 2D lattice potential. The dynamical structure factor of the system is probed by energy deposition through low-momentum Bragg excitations. The experimental signals are compared to recent theoretical predictions for the dynamical structure factor of the Lieb-Liniger model at . Our results demonstrate that the main contribution to the spectral widths stems from the dynamics of the interaction-induced excitations in the gas, which cannot be described by the Luttinger liquid theory.
Keywords
Cite
@article{arxiv.1406.2176,
title = {Dynamical structure factor of one-dimensional Bose gases: experimental signatures of beyond-Luttinger liquid physics},
author = {Nicole Fabbri and Milosz Panfil and David Clément and Leonardo Fallani and Massimo Inguscio and Chiara Fort and Jean-Sébastien Caux},
journal= {arXiv preprint arXiv:1406.2176},
year = {2015}
}