arXiv:cond-mat/0504311 · Physical Review Letters

Parametric Amplification of Matter Waves in Periodically Translated Optical Lattices

Nathan Gemelke, Edina Sarajlic, Yannick Bidel, S. S. Hong, Steven Chu

Published Oct 19, 2005• 110 citations

Abstract

We observe the sudden growth of small classes of Bloch waves from atomic Bose-Einstein condensates held in periodically translated optical lattices. The effect is explained by narrowband parametric amplification of Bloch waves from noise, due to phase-matched scattering of atom pairs out of the condensate. Amplification occurs above a well-defined modulation threshold, described by dynamic shaping of single-particle band structure.

DOI: 10.1103/physrevlett.95.170404

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arXiv:cond-mat/0504311 · Physical Review Letters

Parametric Amplification of Matter Waves in Periodically Translated Optical Lattices

Nathan Gemelke, Edina Sarajlic, Yannick Bidel, S. S. Hong, Steven Chu

Published Oct 19, 2005• 110 citations

arXiv HTML PDF

Abstract

DOI: 10.1103/physrevlett.95.170404

Related papers

Parametric Amplification of Scattered Atom Pairs

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Biao Wu, Roberto B. Diener, Qian Niu

arXiv:cond-mat/0109183Physical Review AJan 16, 2002120 citations

We have observed parametric generation and amplification of ultracold atom pairs. A

^{87}\mathrm{Rb}

Bose-Einstein condensate was loaded into a one-dimensional optical lattice with quasimomentum

{k}_{0}

and spontaneously scattered into two final states with quasimomenta

{k}_{1}

and

{k}_{2}

. Furthermore, when a seed of atoms was first created with quasimomentum

{k}_{1}

we observed parametric amplification of scattered atoms pairs in states

{k}_{1}

and

{k}_{2}

when the phase-matching condition was fulfilled. This process is analogous to optical parametric generation and amplification of photons and could be used to efficiently create entangled pairs of atoms. Furthermore, these results explain the dynamic instability of condensates in moving lattices observed in recent experiments.