Sep 15 – 18, 2014
Dept. of Physics and Astronomy
Europe/Rome timezone

Revealing elementary excitations of one-dimensional Bose gases through their dynamical structure factor

Sep 16, 2014, 4:00 PM
30m
Aula Magna (Dept. of Physics and Astronomy)

Aula Magna

Dept. of Physics and Astronomy

A. Righi Building Via Irnerio 46, 40126 Bologna (Italy)

Speaker

Milosz Panfil

Description

Interactions are known to have dramatic effects on bosonic gases in low dimension: Not only does the ground state transform from a condensate-like state to an effective Fermi sea, but new fundamental excitations are predicted to appear which do not have any higher-dimensional equivalents. In this work, we trace these elusive excitations via their effects on the dynamical structure factor of arrays of one-dimensional strongly-interacting Bose gases at low temperature, 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 finite temperatures. Our results demonstrate that the main contribution to the spectral widths can be explained from the dynamics of the interaction-induced excitations in the gas.

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