New chiral phases of superfluid 3He stabilized by anisotropic silica aerogel

J. Pollanen, J. I.A. Li, C. A. Collett, W. J. Gannon, W. P. Halperin*, J. A. Sauls

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

A rich variety of Fermi systems condense by forming bound pairs, including high-temperature and heavy-fermion superconductors, Sr 2RuO 4 (ref.), cold atomic gases and superfluid 3He (ref. ). Some of these form exotic quantum states with non-zero orbital angular momentum. We have discovered, in the case of 3He, that anisotropic disorder, engineered from highly porous silica aerogel, stabilizes a chiral superfluid state that otherwise would not exist. Furthermore, we find that the chiral axis of this state can be uniquely oriented with the application of a magnetic field perpendicular to the aerogel anisotropy axis. At sufficiently low temperature we observe a sharp transition from a uniformly oriented chiral state to a disordered structure consistent with locally ordered domains, contrary to expectations for a superfluid glass phase.

Original languageEnglish (US)
Pages (from-to)317-320
Number of pages4
JournalNature Physics
Volume8
Issue number4
DOIs
StatePublished - Apr 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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