Disappearance of Quasiparticles in a Bose Lattice Gas
Quantum Gases
2016-08-10 v3
Abstract
We use a momentum-space hole-burning technique implemented via stimulated Raman transitions to measure the momentum relaxation time for a gas of bosonic atoms trapped in an optical lattice. By changing the lattice potential depth, we observe a smooth crossover between relaxation times larger and smaller than the bandwidth. The latter condition violates the Mott-Ioffe-Regal bound and indicates a breakdown of the quasi-particle picture. We produce a simple kinetic model that quantitatively predicts these relaxation times. Finally, we introduce a cooling technique based upon our hole-burning technique.
Keywords
Cite
@article{arxiv.1503.07606,
title = {Disappearance of Quasiparticles in a Bose Lattice Gas},
author = {David Chen and Carolyn Meldgin and Philip Russ and Erich Mueller and Brian DeMarco},
journal= {arXiv preprint arXiv:1503.07606},
year = {2016}
}