Disappearance of quasiparticles in a Bose lattice gas

David Chen, Carolyn Meldgin, Philip Russ, Brian DeMarco, Erich Mueller

Research output: Contribution to journalArticlepeer-review

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-Regel bound and indicates a breakdown of the quasiparticle 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.

Original languageEnglish (US)
Article number021601
JournalPhysical Review A
Volume94
Issue number2
DOIs
StatePublished - Aug 3 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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