Electronic properties and devices articles within Nature Physics

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  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • News & Views |

    Negative refraction can produce optical Veselago lenses with a resolution that is not diffraction-limited. Similar lenses can also be made for electrons, with negative refraction of Dirac fermions now shown in graphene.

    • Péter Makk

  • Letter |

    Bilayer graphene can host topological currents that are robust against defects and are associated with the electron valleys. It is now shown that electric fields can tune this topological valley transport over long distances at room temperature.

    • Mengqiao Sui
    • , Guorui Chen
    •  & Yuanbo Zhang

  • News & Views |

    Graphene is a candidate spintronics material, but its weak intrinsic spin–orbit coupling is problematic. Intercalating graphene on an iridium substrate with islands of lead is now shown to induce a strong, spatially varying spin–orbit coupling.

    • Marko Kralj

  • Article |

    When superconducting discs are deposited on graphene they induce local superconducting islands. The phase coupling between the islands can be controlled by a gate. Quantum phase fluctuations kill the superconductivity and lead to a metallic state, however, at higher magnetic fields superconductivity can return.

    • Zheng Han
    • , Adrien Allain
    •  & Vincent Bouchiat

  • Letter |

    In metals, the Coulomb potential of charged impurities is strongly screened, but in graphene, the potential charge of a few-atom cluster of cobalt can extend up to 10 nm. By measuring differences in the way electron-like and hole-like Dirac fermions are scattered from this potential, the intrinsic dielectric constant of graphene can be determined.

    • Yang Wang
    • , Victor W. Brar
    •  & Michael F. Crommie

  • Article |

    A demonstration of the ability to transmit spin currents over distances of more than one hundred micrometres with an efficiency of up to 75% in graphene grown epitaxially on silicon carbide improves the prospects of graphene-based spintronic devices.

    • Bruno Dlubak
    • , Marie-Blandine Martin
    •  & Albert Fert

  • Article |

    The extra states sometimes observed in graphene’s quantum Hall characteristics have been presumed to be the result of broken SU(4) symmetry. Magnetotransport measurements of high-quality graphene in a tilted magnetic field finally prove this is indeed the case.

    • A. F. Young
    • , C. R. Dean
    •  & P. Kim

  • Letter |

    It is well known that graphene deposited on hexagonal boron nitride produces moiré patterns in scanning tunnelling microscopy images. The interaction that produces this pattern also produces a commensurate periodic potential that generates a set of Dirac points that are different from those of the graphene lattice itself.

    • Matthew Yankowitz
    • , Jiamin Xue
    •  & Brian J. LeRoy

  • Letter |

    The degree to which an electrical current is spin polarized is usually determined by how easily it travels across an interface with a magnetic contact. By using nonlinear interactions between spin and charge in graphene, the polarization of spin currents can be measured without magnetic contacts.

    • Ivan J. Vera-Marun
    • , Vishal Ranjan
    •  & Bart J. van Wees

  • News & Views |

    Graphene exhibits many extraordinary properties, but superconductivity isn't one of them. Two theoretical studies suggest that by decorating the surface of graphene with the right species of dopant atoms, or by using ionic liquid gating, superconductivity could yet be induced.

    • Oskar Vafek

  • Article |

    Chiral superconducting states are expected to support a variety of exotic and potentially useful phenomena. Theoretical analysis suggests that just such a state could emerge in a doped graphene monolayer.

    • Rahul Nandkishore
    • , L. S. Levitov
    •  & A. V. Chubukov

  • Letter |

    Graphene exhibits many extraordinary properties. But, despite many attempts to find ways to induce it, superconductivity is not one of them. First-principles calculations suggest that by decorating the surface of graphene with lithium atoms, it could yet be made to superconduct.

    • Gianni Profeta
    • , Matteo Calandra
    •  & Francesco Mauri

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