Graphene articles within Nature Physics

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  • Research Briefing |

    Rotational symmetry is shown to protect the quadratic dispersion of out-of-plane flexural vibrations in graphene and other two-dimensional materials against phonon–phonon interactions, making the bending rigidity of these materials non-divergent. The quadratic dispersion is then consistent with the propagation of sound in the graphene plane.

  • Letter |

    The anomalous Hall effect can signify that a material has a spontaneous magnetic order. Now, twisted bilayer graphene shows this effect at half filling, suggesting that the ground state is valley-polarized.

    • Chun-Chih Tseng
    • , Xuetao Ma
    •  & Matthew Yankowitz

  • Article |

    Thermal transport measurements provide a complementary view of the electronic structure of a material to electronic transport. This technique is applied to twisted bilayer graphene, and highlights the particle–hole asymmetry of its band structure.

    • Arup Kumar Paul
    • , Ayan Ghosh
    •  & Anindya Das

  • News & Views |

    Low-temperature measurements on twisted bilayer graphene show that the exotic ‘strange metal’ state is almost certainly caused by interactions between electrons.

    • Tobias Stauber
    •  & José González

  • News & Views |

    Experiments show that interactions between electrons in twisted bilayer graphene can create a spatial order that doubles the size of the twisted unit cell.

    • Eric Spanton

  • 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

  • Article |

    Moiré potentials substantially alter the electronic properties of twisted bilayer graphene at a magic twist angle. A propagating plasmon mode, which can be observed with optical nano-imaging, is associated with transitions between the moiré minibands.

    • Niels C. H. Hesp
    • , Iacopo Torre
    •  & Frank H. L. Koppens

  • Letter |

    Placing two Bernal-stacked graphene bilayers on top of each other with a small twist angle gives correlated states. As the band structure can be tuned by an electric field, this platform is a more varied setting to study correlated electrons.

    • Cheng Shen
    • , Yanbang Chu
    •  & Guangyu Zhang

  • News & Views |

    Spatially resolved measurements of twisted bilayer graphene reveal more details of the strongly correlated electrons.

    • Adina Luican-Mayer

  • Article |

    Scanning tunnelling microscopy shows that electrons in twisted bilayer graphene are strongly correlated for a wide range of density. In particular, a correlated regime appears near charge neutrality and theory suggests nematic ordering.

    • Youngjoon Choi
    • , Jeannette Kemmer
    •  & Stevan Nadj-Perge

  • 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 |

    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 |

    The authors theoretically investigate a novel form of a Doppler effect in homogeneous systems with positive refractive index that occurs under certain conditions. It is suggested that this Doppler effect can be experimentally separated from other Doppler effects by using polaritons such as those found in graphene.

    • Xihang Shi
    • , Xiao Lin
    •  & Baile Zhang

  • Measure for Measure |

    Wonder material graphene makes metrology practical and relaxed, says Andre Geim.

    • Andre Geim

  • Letter |

    Graphene systems are clean platforms for studying electron–electron (e–e) collisions. Electron transport in graphene constrictions is now found to behave anomalously due to e–e interactions: conductance values exceed the maximum free-electron value.

    • R. Krishna Kumar
    • , D. A. Bandurin
    •  & A. K. Geim

  • Letter |

    Van der Waals heterostructures provide a tunable platform for probing the Andreev bound states responsible for proximity-induced superconductivity, helping to establish a connection between Andreev physics at finite energy and the Josephson effect.

    • Landry Bretheau
    • , Joel I-Jan Wang
    •  & Pablo Jarillo-Herrero

  • Letter |

    The emergence of optically silent phonons show that strong interlayer electron–phonon coupling can arise in van der Waals heterostructures, with the vibrational modes in one layer coupling to the electronic states in a neighbouring layer.

    • Chenhao Jin
    • , Jonghwan Kim
    •  & Feng Wang

  • News & Views |

    Although Dirac fermions in graphene can tunnel through potential barriers without reflection, two experiments show how they can temporarily be trapped inside nanoscale graphene quantum dots.

    • Heejun Yang

  • News & Views |

    Chiral symmetry breaking is imaged in graphene which, through a mechanism analogous to mass generation in quantum electrodynamics, could provide a means for making it semiconducting.

    • Christopher Mudry

  • Article |

    Scanning tunnelling microscopy shows how the interaction between electrons in graphene and atomic vacancies in a copper substrate produces Kekulé ordering — an electronic phase that breaks chiral symmetry.

    • Christopher Gutiérrez
    • , Cheol-Joo Kim
    •  & Abhay N. Pasupathy

  • News & Views |

    Electric fields can controllably break the inversion symmetry of bilayer graphene, which can be harnessed to generate pure valley currents.

    • François Amet
    •  & Gleb Finkelstein

  • Letter |

    The strong confinement of plasmons in graphene makes them interesting for practical applications, but also difficult to excite. An all-optical technique can excite plasmons in graphene over a range of frequencies.

    • T. J. Constant
    • , S. M. Hornett
    •  & E. Hendry

  • Letter |

    When laser light is focused onto graphene devices in a magnetic field a long-range photo-Nernst effect causes photocurrents to be generated along the free edges.

    • Helin Cao
    • , Grant Aivazian
    •  & Xiaodong Xu

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