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

by Dr Thanh Phuc Nguyen (RIKEN)

Monday 9 Nov 2015, 13:30 → 14:30 Asia/Tokyo

Room 433, Main Research Building (RIKEN Wako)

Date: Nov 09 (Mon) Time: 13:30 - Place: Main Research bldg. 433 Speaker: Nguyen Thanh Phuc (RIKEN) Title: 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 [1]. 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 ofatomtronic devices. [1] Nguyen Thanh Phuc et al., Nat. Com. 6, 8135 (2015). See more QHP seminars