New Chiral Phases of Superfluid 3He Stabilized by Anisotropic Silica Aerogel

Details New Chiral Phases of Superfluid 3He Stabilized by Anisotropic Silica Aerogel New Chiral Phases of Superfluid 3He Stabilized by Anisotropic Silica Aerogel

2012-01-15

arxiv.org/abs/1201.3138v1

Physics

Condensed Matter

Superconductivity

6 pages, 4 figure, and Supplementary Information

Scientific paper

A rich variety of Fermi systems condense by forming bound pairs, including high temperature [1] and heavy fermion [2] superconductors, Sr2RuO4 [3], cold atomic gases [4], and superfluid 3He [5]. Some of these form exotic quantum states having 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. Additionally, 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 suffciently 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 [6].

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