Interspecies thermalization in an ultracold mixture of Cs and Yb in an optical trap

A. Guttridge, S. A. Hopkins, S. L. Kemp, Matthew D. Frye, Jeremy M. Hutson, and Simon L. Cornish
Phys. Rev. A 96, 012704 – Published 14 July 2017

Abstract

We present measurements of interspecies thermalization between ultracold samples of Cs133 and either Yb174 or Yb170. The two species are trapped in a far-off-resonance optical dipole trap and Cs133 is sympathetically cooled by Yb. We extract effective interspecies thermalization cross sections by fitting the thermalization measurements to a kinetic model, giving σCsYb174=5±2×1013cm2 and σCsYb170=18±8×1013cm2. We perform quantum scattering calculations of the thermalization cross sections and optimize the CsYb interaction potential to reproduce the measurements. We predict scattering lengths for all isotopic combinations of Cs and Yb. We also demonstrate the independent production of Yb174 and Cs133 Bose-Einstein condensates using the same optical dipole trap, an important step toward the realization of a quantum-degenerate mixture of the two species.

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  • Received 10 April 2017

DOI:https://doi.org/10.1103/PhysRevA.96.012704

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

A. Guttridge1,*, S. A. Hopkins1, S. L. Kemp1, Matthew D. Frye2,†, Jeremy M. Hutson2, and Simon L. Cornish1,‡

  • 1Joint Quantum Centre (JQC) Durham-Newcastle, Department of Physics, Durham University, South Road, Durham, DH1 3LE, United Kingdom
  • 2Joint Quantum Centre (JQC) Durham-Newcastle, Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, United Kingdom

  • *alexander.guttridge@durham.ac.uk
  • matthew.frye@durham.ac.uk
  • s.l.cornish@durham.ac.uk

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Issue

Vol. 96, Iss. 1 — July 2017

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