Quantum Hall articles within Nature Physics

Featured

  • Article
    | Open Access

    Non-Hermitian systems can be described in terms of gain and loss with a coupled environment—a hard feature to tune in quantum devices. Now an experiment shows non-Hermitian topology in a quantum Hall ring without relying on gain and loss.

    • Kyrylo Ochkan
    • , Raghav Chaturvedi
    •  & Ion Cosma Fulga

  • News & Views |

    Non-perturbing spectroscopy allows the observation of fragile fractional quantum Hall states and broken symmetries in graphene with atomic precision.

    • En-Min Shih
    •  & Marlou R. Slot

  • Article |

    In two-dimensional systems, swapping the position of two indistinguishable particles twice—braiding them—reveals their exchange statistics. Now, a Mach–Zehnder interferometer accomplishes this for anyonic fractional quantum Hall states.

    • Hemanta Kumar Kundu
    • , Sourav Biswas
    •  & Moty Heiblum

  • Article |

    Interactions between photons arise due to the presence of optical nonlinearities. In topological Thouless pumps, a sufficiently strong nonlinearity leads to soliton transport with a fractionally quantized plateau structure—reminiscent of transport in the fractional quantum Hall effect.

    • Marius Jürgensen
    • , Sebabrata Mukherjee
    •  & Mikael C. Rechtsman

  • Article |

    Shot noise has traditionally been used to measure the charge of quasiparticles in a variety of mesoscopic systems. However, at sufficiently low temperatures, this usual notion tends to break down for fractional quantum Hall effect states.

    • Sourav Biswas
    • , Rajarshi Bhattacharyya
    •  & Yuval Gefen

  • Article |

    Topological states characterized by Chern numbers are usually considered to be the global properties of a material. Now a spatial patchwork of different Chern insulator states is imaged in twisted bilayer graphene.

    • Sameer Grover
    • , Matan Bocarsly
    •  & Eli Zeldov

  • News & Views |

    Magnons are collective spin excitations that can propagate over long distances — an attractive trait for information-transfer technologies — but we need to better understand their thermodynamic properties. A platform using graphene may hold the key.

    • Matteo Carrega
    •  & Stefan Heun

  • Letter
    | Open Access

    Although magnons in the quantum Hall regime of graphene have been detected, their thermodynamic properties have not yet been measured. Now, a local probe technique enables the detection of the magnon density and chemical potential.

    • Andrew T. Pierce
    • , Yonglong Xie
    •  & Amir Yacoby

  • Letter |

    Propagating spin waves known as magnons are expected to carry a dipole moment in the quantum Hall regime. Now, this moment has been detected, demonstrating that the degrees of freedom of spin and charge are entangled in quantum Hall magnons.

    • A. Assouline
    • , M. Jo
    •  & P. Roulleau

  • Perspective |

    Superconductivity and ordered states formed by interactions—both of which could be unconventional—have recently been observed in a family of kagome materials.

    • Titus Neupert
    • , M. Michael Denner
    •  & M. Zahid Hasan

  • News & Views |

    The properties of anyons — two-dimensional particles that are neither fermions nor bosons — have been directly measured in a quantum Hall interferometer.

    • Rui-Rui Du

  • Article |

    An interferometer device is used to detect the quantum-mechanical phase that is gained when two anyons are braided around each other. The fractional value of the phase proves that these quasiparticles are neither bosons nor fermions.

    • J. Nakamura
    • , S. Liang
    •  & M. J. Manfra

  • Letter |

    Composite fermions can be tuned to very low effective density in a clean two-dimensional electron gas, which allows the formation of a Bloch ferromagnet.

    • Md Shafayat Hossain
    • , Tongzhou Zhao
    •  & M. Shayegan

  • Letter |

    When a quantum system couples with its surroundings, macroscopic irreversibility emerges even though the microscopic Hamiltonian is itself time-reversal symmetric, causing the phenomena associated with certain symmetry-protected topological phases to be unstable.

    • Max McGinley
    •  & Nigel R. Cooper

  • Letter |

    The spin polarization of a quantum Hall system is determined by a spin-resolved tunnelling method. This technique shows a substantial regime where the weakly interacting composite fermion picture is not valid.

    • H. M. Yoo
    • , K. W. Baldwin
    •  & R. C. Ashoori

  • Letter |

    The quantum Hall effect is realized in a two-dimensional quantum gas system consisting of one spatial dimension and one synthetic dimension encoded in the atomic spin. Measurements show distinct bulk properties rooted in the topological structure.

    • Thomas Chalopin
    • , Tanish Satoor
    •  & Sylvain Nascimbene

  • Perspective |

    The identification of superconductivity and strong interactions in twisted bilayer 2D materials prompted many questions about the interplay of these phenomena. This Perspective presents the status of the field and the urgent issues for future study.

    • Leon Balents
    • , Cory R. Dean
    •  & Andrea F. Young

  • Article |

    The interface between a quantum Hall state and a superconductor hosts topological modes. Here, interference between two such modes turns an electron into either a hole or an electron depending on the phase difference along the interference path.

    • Lingfei Zhao
    • , Ethan G. Arnault
    •  & Gleb Finkelstein

  • Research Highlight |

    • David Abergel

  • Letter |

    The authors use spin waves to demonstrate that charged quantum Hall skyrmions exist away from integer filling. They also see evidence of several fractional skyrmion states.

    • H. Zhou
    • , H. Polshyn
    •  & A. F. Young

  • Article |

    The remarkably large thermal Hall response recently observed in the copper oxides challenges our understanding of the excitations in an insulating antiferromagnet. Here, a possible explanation of the underlying physics is provided.

    • Rhine Samajdar
    • , Mathias S. Scheurer
    •  & Subir Sachdev

  • News & Views |

    A rich pattern of fractional quantum Hall states in graphene double layers can be naturally explained in terms of two-component composite fermions carrying both intra- and interlayer vortices.

    • Gábor A. Csáthy
    •  & Jainendra K. Jain

  • Letter |

    It is shown that composite fermions in the fractional quantum Hall regime form paired states in double-layer graphene. Pairing between layers gives a phase similar to an exciton condensate and pairing within a layer may lead to non-abelian states.

    • J. I. A. Li
    • , Q. Shi
    •  & C. R. Dean

  • News & Views |

    An electrical interferometer device has detected interference patterns that suggest anyons could be conclusively demonstrated in the near future.

    • Steven H. Simon

  • Letter |

    A graphene-like two-dimensional sonic crystal, under uniaxial deformation, experiences a giant uniform pseudomagnetic field. This leads to the quantization of the cyclotron orbits—a kind of acoustic Landau level—that is observed here.

    • Xinhua Wen
    • , Chunyin Qiu
    •  & Zhengyou Liu

  • Letter |

    The quantum Hall effect is thought to exist only in two-dimensional materials. Here, transport measurements show that thin graphite slabs have a 2.5-dimensional version, with a parity effect for samples with odd and even number of layers.

    • Jun Yin
    • , Sergey Slizovskiy
    •  & Artem Mishchenko

  • Article |

    A polariton is a hybrid excitation resulting from strong light–matter coupling. The magneto-transport measurements have now revealed the crucial role played by its electronic component.

    • Gian L. Paravicini-Bagliani
    • , Felice Appugliese
    •  & Jérôme Faist

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