Quantum fluids and solids

Quantum fluids and solids are substances in which the interaction between the constituent atoms or molecules is governed by the laws of quantum mechanics. The properties of these materials are strongly influenced by the motion of atoms even in their lowest energy state, known as zero-point motion.

Latest Research and Reviews

  • Research |

    So far only signatures of excitonic insulators have been reported, but here direct thermodynamic evidence is provided for a strongly correlated excitonic insulating state in transition metal dichalcogenide semiconductor double layers.

    • Liguo Ma
    • , Phuong X. Nguyen
    •  & Jie Shan
    Nature 598, 585-589
  • Research
    | Open Access

    The pseudogap phase in cuprate superconductors is predicted to be a pair density wave state (PDW) but experimental evidence has been lacking. Here, the authors detect the temperature evolution of energy gap modulations and scattering interference signature suggesting the Bi2Sr2CaDyCu2O8 pseudogap phase contains a PDW.

    • Shuqiu Wang
    • , Peayush Choubey
    •  & J. C. Séamus Davis
  • Research
    | Open Access

    Kondo insulators exhibit a characteristic low-temperature saturation in resistivity the reasons for which have so far eluded physical explanation. Here, using many-body simulations the authors propose an alternative mechanism where the finite lifetimes of the intrinsic bulk carriers play an integral role.

    • Matthias Pickem
    • , Emanuele Maggio
    •  & Jan M. Tomczak
  • Research
    | Open Access

    Quantum spin liquid states are realized in systems with frustrated magnetic interactions. Here, the authors show that tunable frustrated spin-spin interactions can be induced by coupling a quantum antiferromagnet to the quantized light of a driven optical cavity, giving rise to robust quantum spin liquid states.

    • Alessio Chiocchetta
    • , Dominik Kiese
    •  & Sebastian Diehl
  • Research
    | Open Access

    Sr3Ru2O7 exhibits a quantum critical point tunable by magnetic field and has been widely used in the study of criticality. Here, by using inelastic neutron scattering, the authors measure collective magnetic excitations near the quantum critical point and relate them to thermodynamic properties and spin density wave order.

    • C. Lester
    • , S. Ramos
    •  & S. M. Hayden
  • Research |

    So far, only indirect evidence of Wigner crystals has been reported, but a specially designed scanning tunnelling microscope is used here to directly image them in a moiré heterostructure.

    • Hongyuan Li
    • , Shaowei Li
    •  & Feng Wang
    Nature 597, 650-654

News and Comment

  • News & Views |

    The two-fluid model of superfluids predicts a second, quantum mechanical form of sound. Ultracold atom experiments have now measured second sound in the unusual two-dimensional superfluid described by the Berezinskii–Kosterlitz–Thouless transition.

    • Sandro Stringari
    Nature Physics 17, 770-771
  • News & Views |

    The contact formalism describes short-range correlations, which play a crucial role in nuclear systems. Initially introduced for ultracold atoms, its generalization to the nuclear case was now validated by ab initio calculations.

    • Michael Urban
    Nature Physics 17, 294-295