Ultracold metastable helium-4 and helium-3 gases

Wim Vassen, T. Jeltes, J.M. McNamara, A. Tychkov, W. Hogervorst, K.A.H. van Leeuwen, V. Krachmalnicoff, M. Schellekens, A. Perrin, H. Chang, D. Boiron, A. Aspect, C.I. Westbrook

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review


We discuss our work to obtain a condensate containing more than 107 atoms and the first degenerate Fermi gas in a metastable state. Sympathetic cooling with Helium-4 is used to cool 106 Helium-3 atoms to a temperature T/TF < 0.5. The ultracold bosonic and fermionic gases have been used to observe the Hanbury Brown and Twiss effect for both isotopes, showing bunching for the bosons and antibunching for the fermions. A proposal for high resolution spectroscopy at 1.557 μm, connecting both metastable states directly, is discussed at the end.
Original languageEnglish
Title of host publicationIn: Proceedings of the XVIII International Conference on Laser Spectroscopy (ICOLS2007)
Place of PublicationSingapore
PublisherWorld Scientific Publishing Co.
ISBN (Print)9789812813206
Publication statusPublished - 2008
EventXVIII International conference on ICOLS 2007: Laser Spectroscopy - Telluride, United States
Duration: 24 Jun 200729 Jun 2007


ConferenceXVIII International conference on ICOLS 2007
Country/TerritoryUnited States


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