Energy absorption of a Bose gas in a periodically modulated optical lattice

TL;DR

This paper analyzes how a one-dimensional Bose gas in an optical lattice absorbs energy when the lattice amplitude is periodically modulated, revealing features characteristic of low-dimensional physics and comparing well with experimental data.

Contribution

It provides a theoretical analysis of energy absorption in modulated optical lattices for both superfluid and Mott insulator phases, extending beyond standard Bogoliubov theory.

Findings

Energy absorption rate shows distinctive low-dimensional features.

Results agree well with experimental observations.

Analysis includes both weak and strong lattice regimes.

Abstract

We compute the energy absorbed by a one dimensional system of cold bosonic atoms in an optical lattice subjected to lattice amplitude modulation periodic with time. We perform the calculation for the superfluid and the Mott insulator created by a weak lattice, and the Mott insulator in a strong lattice potential. For the latter case we show results for 3D systems as well. Our calculations, based on bosonization techniques and strong coupling methods, go beyond standard Bogoliubov theory. We show that the energy absorption rate exhibits distinctive features of low dimensional systems and Luttinger liquid physics. We compare our results with experiments and find good agreement.