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Emergent Weyl excitations in systems of polar particles

Author

Listed:
  • Sergey V. Syzranov

    (University of Colorado
    JILA, NIST, University of Colorado
    Center for Theory of Quantum Matter, University of Colorado
    Joint Quantum Institute, University of Maryland)

  • Michael L. Wall

    (JILA, NIST, University of Colorado
    Center for Theory of Quantum Matter, University of Colorado
    Present address: The Johns Hopkins Applied Physics Laboratory, Laurel, MD 20723, USA)

  • Bihui Zhu

    (University of Colorado
    JILA, NIST, University of Colorado
    Center for Theory of Quantum Matter, University of Colorado)

  • Victor Gurarie

    (University of Colorado
    JILA, NIST, University of Colorado
    Center for Theory of Quantum Matter, University of Colorado)

  • Ana Maria Rey

    (University of Colorado
    JILA, NIST, University of Colorado
    Center for Theory of Quantum Matter, University of Colorado)

Abstract

Weyl fermions are massless chiral particles first predicted in 1929 and once thought to describe neutrinos. Although never observed as elementary particles, quasiparticles with Weyl dispersion have recently been experimentally discovered in solid-state systems causing a furore in the research community. Systems with Weyl excitations can display a plethora of fascinating phenomena and offer great potential for improved quantum technologies. Here, we show that Weyl excitations generically exist in three-dimensional systems of dipolar particles with weakly broken time-reversal symmetry (by for example a magnetic field). They emerge as a result of dipolar-interaction-induced transfer of angular momentum between the J=0 and J=1 internal particle levels. We also discuss momentum-resolved Ramsey spectroscopy methods for observing Weyl quasiparticles in cold alkaline-earth-atom systems. Our results provide a pathway for a feasible experimental realization of Weyl quasiparticles and related phenomena in clean and controllable atomic systems.

Suggested Citation

  • Sergey V. Syzranov & Michael L. Wall & Bihui Zhu & Victor Gurarie & Ana Maria Rey, 2016. "Emergent Weyl excitations in systems of polar particles," Nature Communications, Nature, vol. 7(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13543
    DOI: 10.1038/ncomms13543
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