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Controlling and probing non-abelian emergent gauge potentials in spinor Bose-Fermi mixtures.


ABSTRACT: Gauge fields, typified by the electromagnetic field, often appear as emergent phenomena due to geometrical properties of a curved Hilbert subspace, and provide a key mechanism for understanding such exotic phenomena as the anomalous and topological Hall effects. Non-abelian gauge potentials serve as a source of non-singular magnetic monopoles. Here we show that unlike conventional solid materials, the non-abelianness of emergent gauge potentials in spinor Bose-Fermi atomic mixtures can be continuously varied by changing the relative particle-number densities of bosons and fermions. The non-abelian feature is captured by an explicit dependence of the measurable spin current density of fermions in the mixture on the variable coupling constant. Spinor mixtures also provide us with a method to coherently and spontaneously generate a pure spin current without relying on the spin Hall effect. Such a spin current is expected to have potential applications in the new generation of atomtronic devices.

SUBMITTER: Phuc NT 

PROVIDER: S-EPMC4569724 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature

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Controlling and probing non-abelian emergent gauge potentials in spinor Bose-Fermi mixtures.

Phuc Nguyen Thanh NT   Tatara Gen G   Kawaguchi Yuki Y   Ueda Masahito M  

Nature communications 20150902


Gauge fields, typified by the electromagnetic field, often appear as emergent phenomena due to geometrical properties of a curved Hilbert subspace, and provide a key mechanism for understanding such exotic phenomena as the anomalous and topological Hall effects. Non-abelian gauge potentials serve as a source of non-singular magnetic monopoles. Here we show that unlike conventional solid materials, the non-abelianness of emergent gauge potentials in spinor Bose-Fermi atomic mixtures can be contin  ...[more]

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