Enhancing laser sideband cooling in one-dimensional optical lattices via the dipole interaction

TL;DR

This paper investigates how dipole interactions influence the effectiveness of resolved sideband laser cooling in a one-dimensional optical lattice, revealing that interactions can both raise and lower the final phonon temperature depending on parameters.

Contribution

It introduces a theoretical framework to analyze dipole interactions in laser cooling of optical lattices, showing their significant impact on cooling outcomes.

Findings

Dipole interactions alter the final phonon temperature in the lattice.

Total phonon energy can be higher or lower than non-interacting cases.

Proper parameter choices can optimize cooling efficiency.

Abstract

We study resolved sideband laser cooling of a one-dimensional optical lattice with one atom per site, and in particular the effect of the dipole interaction between radiating atoms. For simplicity, we consider the case where only a single cooling laser is applied. We derive a master equation, and solve it in the limit of a deep lattice and weak laser driving. We find that the dipole interaction significantly changes the final temperature of the particles, increasing it for some phonon wavevectors and decreasing it for others. The total phonon energy over all modes is typically higher than in the non-interacting case, but can be made lower by the right choice of parameters.