Quantum fluids and solids articles within Nature

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  • Article
    | Open Access

    We introduce strong tailored light-wave-driven time-reversal symmetry breaking in monolayer hexagonal boron nitride, realizing a sub-laser-cycle controllable analogue of the topological model of Haldane and inducing non-resonant valley polarization.

    • Sambit Mitra
    • , Álvaro Jiménez-Galán
    •  & Shubhadeep Biswas

  • Article |

    A magnetic-field-induced Wigner crystal in Bernal-stacked bilayer graphene was directly imaged using high-resolution scanning tunnelling microscopy and its structural properties as a function of electron density, magnetic field and temperature were examined.

    • Yen-Chen Tsui
    • , Minhao He
    •  & Ali Yazdani

  • Article
    | Open Access

    By stabilizing a stationary giant quantum vortex in superfluid 4He and introducing a minimally invasive way to characterize the vortex flow, intricate wave–vortex interactions are shown to simulate black hole ringdown physics.

    • Patrik Švančara
    • , Pietro Smaniotto
    •  & Silke Weinfurtner

  • Article |

    Evidence for a quantum magnetic analogue of a supersolid appears in a recently synthesized antiferromagnet showing a strong magnetocaloric effect of the spin supersolid phase with potential for applications in sub-kelvin refrigeration.

    • Junsen Xiang
    • , Chuandi Zhang
    •  & Gang Su

  • Article |

    We establish a spin nematic phase in the square-lattice iridate Sr2IrO4 and find a complete breakdown of coherent magnon excitations at short-wavelength scales, suggesting a many-body quantum entanglement in the antiferromagnetic state.

    • Hoon Kim
    • , Jin-Kwang Kim
    •  & B. J. Kim

  • Article |

    A one-dimensional trapped-ion quantum simulator with up to 23 spins is used to demonstrate a continuous symmetry-breaking phase that relies on long-range interactions.

    • Lei Feng
    • , Or Katz
    •  & Christopher Monroe

  • Article |

    The realization of dipolar quantum solids with an ultracold gas of magnetic atoms in an optical lattice ushers in quantum simulation of many-body systems with long-range anisotropic interactions.

    • Lin Su
    • , Alexander Douglas
    •  & Markus Greiner

  • Article
    | Open Access

    Evidence is presented for a Pines’ demon as a three-dimensional acoustic plasmon in the multiband metal Sr2RuO4 from momentum-resolved electron energy-loss spectroscopy using a collimated, defocused beam with high momentum resolution.

    • Ali A. Husain
    • , Edwin W. Huang
    •  & Peter Abbamonte

  • Article |

    By using new on-chip terahertz spectroscopy techniques to measure the absorption spectra of a graphene microribbon as well as the energy waves close to charge neutrality, hydrodynamic collective excitations are observed.

    • Wenyu Zhao
    • , Shaoxin Wang
    •  & Feng Wang

  • Article |

    The authors measure elastic p-wave interaction energies in pairs of fermionic atoms occupying the lowest two orbitals of an optical lattice; isolation of individual pairs of atoms protects against three-body recombination, enabling a theoretical maximum of interaction energy to be achieved.

    • Vijin Venu
    • , Peihang Xu
    •  & Joseph H. Thywissen

  • Article |

    Using particle-by-particle assembly and adiabatic manipulation of disorder, low-entropy, strongly correlated quantum fluids of light are constructed, opening up new possibilities for the preparation of exotic phases of synthetic matter.

    • Brendan Saxberg
    • , Andrei Vrajitoarea
    •  & David I. Schuster

  • Article |

    Confining semiconductor dipolar excitons using an artificial two-dimensional square lattice emulates extended Bose–Hubbard Hamiltonians, thus enabling control of boson-like arrays in lattices with programmable geometries and more than 100 sites.

    • C. Lagoin
    • , U. Bhattacharya
    •  & F. Dubin

  • Article |

    Vortices in an electron fluid are directly observed in a para-hydrodynamic regime in which the spatial diffusion of electron momenta is enabled by small-angle scattering rather than electron–electron scattering.

    • A. Aharon-Steinberg
    • , T. Völkl
    •  & E. Zeldov

  • Article |

    Spontaneous crystallization of atoms occurs in a rotating ultracold Bose–Einstein condensate occupying the lowest Landau level, behaviour that is related to a quantum hydrodynamic instability driven by shear forces.

    • Biswaroop Mukherjee
    • , Airlia Shaffer
    •  & Martin Zwierlein

  • Article |

    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

  • Article |

    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

  • Article |

    Fizeau drag of plasmon polaritons by an electron flow in strongly biased monolayer graphene is directly observed by exploiting the high electron mobility and slow plasmon propagation of Dirac electrons.

    • Wenyu Zhao
    • , Sihan Zhao
    •  & Feng Wang

  • Article |

    First and second sound are experimentally observed in a two-dimensional superfluid, and the temperature-dependent sound speeds reveal the predicted jump in the superfluid density at the infinite-order Berezinskii–Kosterlitz–Thouless transition.

    • Panagiotis Christodoulou
    • , Maciej Gałka
    •  & Zoran Hadzibabic

  • Article |

    Magic-angle graphene is found to have an exotic phase transition where, on heating, entropy is transferred from motional to magnetic degrees of freedom, analogously to the Pomeranchuk effect in 3He.

    • Asaf Rozen
    • , Jeong Min Park
    •  & Shahal Ilani

  • Article |

    Viscous Dirac fluid flow in room-temperature graphene is imaged using quantum diamond magnetometry, revealing a parabolic Poiseuille profile for electron flow in a high-mobility graphene channel near the charge-neutrality point.

    • Mark J. H. Ku
    • , Tony X. Zhou
    •  & Ronald L. Walsworth

  • Article |

    Pairs of photons in the Laughlin state are created by mimicking a fractional quantum Hall system using the synthetic magnetic field induced by a twisted optical cavity and Rydberg-mediated polariton interactions.

    • Logan W. Clark
    • , Nathan Schine
    •  & Jonathan Simon

  • Letter |

    Observation of the collective mode responding to the superfluid stiffness—the low-energy Goldstone mode—provides direct evidence for phase rigidity, which is a key signature of supersolidity in an ultracold quantum gas.

    • Mingyang Guo
    • , Fabian Böttcher
    •  & Tilman Pfau

  • Letter |

    Magnetic-flux noise measurements with a SQUID-based spectrometer demonstrate the presence of a magnetic monopole plasma in Dy2Ti2O7.

    • Ritika Dusad
    • , Franziska K. K. Kirschner
    •  & J. C. Séamus Davis

  • Article |

    Engineered dissipation is used to stabilize a Mott-insulator phase of photons trapped in a superconducting circuit, providing insights into thermalization processes in strongly correlated quantum matter.

    • Ruichao Ma
    • , Brendan Saxberg
    •  & David I. Schuster

  • Letter |

    A quantum-liquid state of spin–orbital-entangled magnetic moments is observed in the 5d-electron honeycomb iridate H3LiIr2O6, evidenced by the absence of magnetic ordering down to 0.05 kelvin.

    • K. Kitagawa
    • , T. Takayama
    •  & H. Takagi

  • Letter |

    Ab initio calculations are used to determine the contribution of quantum fluctuations to the crystal structure of the high-pressure superconducting phase of H3S and D3S; the quantum nature of the proton is found to fundamentally change the superconducting phase diagram of H3S.

    • Ion Errea
    • , Matteo Calandra
    •  & Francesco Mauri

  • Letter |

    WebSpontaneous translational symmetry breaking is experimentally observed in a dipolar Bose–Einstein condensate of dysprosium atoms, whereby an instability causes a spontaneous transition from an unstructured superfluid to an ordered arrangement of droplet crystals, which is surprisingly long-lived.

    • Holger Kadau
    • , Matthias Schmitt
    •  & Tilman Pfau

  • Letter |

    In non-Hermitian systems, spectral degeneracies can arise that can cause unusual, counter-intuitive effects; here exciton-polaritons—hybrid light–matter particles—within a semiconductor microcavity are found to display non-trivial topological modal structure exclusive to such systems.

    • T. Gao
    • , E. Estrecho
    •  & E. A. Ostrovskaya

  • Letter |

    An electrically pumped polariton laser is constructed using a quantum well microcavity, and its polaritonic nature is demonstrated unambiguously by using a magnetic field to probe the part-light, part-matter character of the system.

    • Christian Schneider
    • , Arash Rahimi-Iman
    •  & Sven Höfling

  • Review Article |

    The current experimental and theoretical status of spin–orbit coupling in ultracold atomic systems is discussed, highlighting unique features that enable otherwise impossible physics.

    • Victor Galitski
    •  & Ian B. Spielman

  • Letter |

    Neutron scattering measurements on single-crystal samples of the mineral herbertsmithite, which is a spin-1/2 kagome-lattice antiferromagnet, provide evidence of fractionalized spin excitations at low temperatures, indicating that the ground state of herbertsmithite may be a quantum spin liquid.

    • Tian-Heng Han
    • , Joel S. Helton
    •  & Young S. Lee

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