Interference of parametrically driven one-dimensional ultracold gases

TL;DR

This paper theoretically investigates how periodic modulation of interactions in one-dimensional ultracold gases creates interference patterns that reveal collective excitations and can probe fundamental properties like sound velocity and spin-charge separation.

Contribution

It introduces a method to excite and analyze collective modes in 1D ultracold gases via parametric driving, linking interference patterns to underlying many-body physics.

Findings

Periodic modulation excites collective modes at drive frequency.

Interference patterns reveal spatial oscillations linked to sound velocity.

Potential to probe spin-charge separation in fermionic systems.

Abstract

We theoretically analyze interference patterns of parametrically driven one dimensional ultracold atomic gases. By modulating the interaction strength periodically in time, we propose to excite collective modes in a pair of independent one dimensional gases at energies corresponding to the drive frequency. The excited collective modes lead to spatial oscillations in the correlations of the interference pattern, which can be analyzed to obtain the sound velocity of the collective modes. We discuss both bosonic and fermionic systems, and how such experiments could be used to probe spin charge separation.