Bose–Einstein condensates articles within Nature Communications

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  • Article
    | Open Access

    The crossover between the weak-coupling limit and strong-coupling limit provides important information for quantum bound states of interacting fermions. Here, Kasahara et al. report thermodynamic evidence for prevailing phase fluctuations of superconductivity, highlighting unusual normal state in the BCS-BEC crossover regime.

    • S. Kasahara
    • , T. Yamashita
    •  & Y. Matsuda

  • Article
    | Open Access

    Magnons, quantized spin excitations in magnetic materials, may undergo Bose-Einstein condensation into a macroscopic correlated quantum state at low temperature. Here, the authors demonstrate how magnon condensation in quantum magnet TlCuCl3generates an electrical polarization.

    • S. Kimura
    • , K. Kakihata
    •  & H. Tanaka

  • Article
    | Open Access

    The optical trapping of ultracold atoms allows for the simulation and controlled exploration of phenomena normally found in condensed matter systems. Here, the authors demonstrate spin–orbit coupling between lattice band pseudospins in a Bose-Einstein condensate of ultracold atoms.

    • M. A. Khamehchi
    • , Chunlei Qu
    •  & P. Engels

  • Article
    | Open Access

    Microcavity polaritons are a fluid of coupled photonic and electronic excitations that share many of the properties of Bose–Einstein condensates. Here, the authors show that the sudden creation of these bosonic fluids at high density results in the concentration of the particles, unlike an atomic gas that would expand.

    • L. Dominici
    • , M. Petrov
    •  & D. Sanvitto

  • Article |

    Interacting quantum many-body systems in low dimensions is an active research area in ultra-cold gases. Here, Chomaz et al.study the dimensional crossover of Bose–Einstein condensation and observe the emergence of phase coherence in an ultra-cold quasi-2D Bose gas confined to a flat-bottom trapping potential.

    • Lauriane Chomaz
    • , Laura Corman
    •  & Jean Dalibard

  • Article |

    Spin-orbit coupling in a Bose–Einstein condensate provides an additional degree of freedom to explore interesting phenomena. Hamner et al.study the ground state of such a system and show that it exhibits a transition between normal and superradiant phases that can be described by the Dicke model.

    • Chris Hamner
    • , Chunlei Qu
    •  & Peter Engels

  • Article
    | Open Access

    Ramsey interferometers are used to measure minute energy shifts, but they are usually only applied to simple, non-interacting ensembles. Here, the authors demonstrate a two-pulse Ramsey-type interferometer built on the motional states of an interacting Bose–Einstein condensate using optimal control.

    • S. van Frank
    • , A. Negretti
    •  & J. Schmiedmayer

  • Article |

    Efimov trimers are bound states of three bosons, which exist even if their attraction is too weak to form a pair state. Here, the authors explore the phase diagram of a unitary Bose gas and find a transition from a normal gas to a superfluid Efimov liquid, held together by the same effects as Efimov trimers.

    • Swann Piatecki
    •  & Werner Krauth

  • Article |

    In contrast to real atoms, Bose–Einstein condensation of quasi-particles does not require low temperature, but is obtained via external pumping. Here, the authors show an unexpected transitional dynamics of a Bose–Einstein condensate of magnons due to a nonlinear evaporative supercooling mechanism.

    • Alexander A. Serga
    • , Vasil S. Tiberkevich
    •  & Burkard Hillebrands

  • Article |

    Ultracold atomic gases provide a playground for exploring exotic quantum phases, like superfluids with staggered orbital currents. Li et al.show that thermal fluctuations can destroy such a state in two stages, revealing a new intermediate chiral Bose liquid with a striking dynamical fingerprint.

    • Xiaopeng Li
    • , Arun Paramekanti
    •  & W. Vincent Liu

  • Article
    | Open Access

    Atom interferometers exploit wave-particle duality and can be used as sensitive measurement devices. Berrada et al.present a Mach–Zehnder interferometer for Bose–Einstein condensates trapped on an atom chip and demonstrate enhanced performance using non-classical states.

    • T. Berrada
    • , S. van Frank
    •  & J Schmiedmayer

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