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

Nguyen Thanh Phuc (), Gen Tatara, Yuki Kawaguchi and Masahito Ueda
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Nguyen Thanh Phuc: RIKEN Center for Emergent Matter Science (CEMS)
Gen Tatara: RIKEN Center for Emergent Matter Science (CEMS)
Yuki Kawaguchi: University of Tokyo
Masahito Ueda: RIKEN Center for Emergent Matter Science (CEMS)

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms9135

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