Topological matter articles within Nature Materials

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  • News & Views |

    Large tensile pressure applied to the putative topological Kondo insulator SmB6 results in an expansion of the lattice in all directions, and a huge increase in the temperature range over which surface-dominated conduction can be observed.

    • Andrew P. Mackenzie
    •  & Clifford W. Hicks

  • News & Views |

    Exploiting the spin Hall effect acting on magnetic oxides outlines an unprecedented path towards low-power, non-volatile spintronics devices.

    • Jörg Wunderlich

  • News & Views |

    The combination of topological properties and magnetic order can lead to new quantum states and exotic physical phenomena. In particular, the coupling between topological insulators and antiferromagnets enables magnetic and electronic structural engineering.

    • Thorsten Hesjedal
    •  & Yulin Chen

  • Editorial |

    Topological semimetals give access to new quantum phenomena — for example, massless fermions have not been observed as elementary particles, yet they can be realized in the form of quasiparticles in these materials — and could allow the development of robust quantum devices.

  • News & Views |

    The half-Heusler GdPtBi is found to show transport and calorimetric signatures of the existence of Weyl fermions under the application of a magnetic field. The half-Heusler alloys form a big family of tunable compounds that may substantially enlarge the number of Weyl semimetals known.

    • Claudia Felser
    •  & Binghai Yan

  • Commentary |

    Topological semimetals and metals have emerged as a new frontier in the field of quantum materials. Novel macroscopic quantum phenomena they exhibit are not only of fundamental interest, but may hold some potential for technological applications.

    • A. A. Burkov

  • Commentary |

    Physicists have discovered a new topological phase of matter, the Weyl semimetal, whose surface features a non-closed Fermi surface whereas the low-energy quasiparticles in the bulk emerge as Weyl fermions. A brief review of these developments and perspectives on the next steps forward are presented.

    • Shuang Jia
    • , Su-Yang Xu
    •  & M. Zahid Hasan

  • Letter |

    MoTe2 is reported to host type II topological Weyl semimetal states. Two sets of Weyl points exist at different energies above the Fermi energy. Fermi arcs that form closed loops and are unique to type II Weyl semimetals are also found.

    • Lunan Huang
    • , Timothy M. McCormick
    •  & Adam Kaminski

  • News & Views |

    The observations of unusual edge properties in scanning tunnelling spectroscopy and the predicted band structure in photoemission spectra of a monolayer FeSe superconductor reveal its non-trivial topological nature.

    • Wei-Feng Tsai
    •  & Hsin Lin

  • Letter |

    The half-Heusler GdPtBi is reported to exhibit negative longitudinal magnetoresistance. This is attributed to the chiral anomaly due to the formation of Weyl nodes with an applied magnetic field. The anomaly is also found to suppress the thermopower.

    • Max Hirschberger
    • , Satya Kushwaha
    •  & N. P. Ong

  • News & Views |

    Bismuth iodide Bi4I4, composed of quasi-one-dimensional molecular chains, was theoretically predicted and now has been experimentally verified to be a novel strong topological insulator.

    • Huaqing Huang
    •  & Wenhui Duan

  • News & Views |

    Studying three Weyl semimetals of the same family — TaAs, TaP and NbP — reveals how the properties of Weyl points and Fermi arcs depend on the spin–orbit coupling and on surface conditions.

    • Xi Dai

  • Article |

    The growth of stanene on bismuth telluride has been achieved using molecular beam epitaxy. Photoemission spectroscopy and theoretical calculations are used to investigate the effects of the substrate on the electronic properties of the Sn layers.

    • Feng-feng Zhu
    • , Wei-jiong Chen
    •  & Jin-feng Jia

  • News & Views |

    Lattice distortions can be used to manipulate surface states in topological crystalline insulators. This discovery suggests new methods to control the motion of electrons in 2D electron systems.

    • Kai Sun

  • Letter |

    The lifting of valley degeneracy in the monolayer transition metal dichalcogenide WS2 is now demonstrated by the optical Stark effect, showing that each valley can be selectively tuned by up to 18 meV.

    • Edbert J. Sie
    • , James W. McIver
    •  & Nuh Gedik

  • Letter |

    Three-dimensional Dirac semimetals such as Cd3As2 are attracting attention because their electronic structure can be considered to be the three-dimensional analogue of graphene’s. Low-temperature scanning tunnelling measurements of the 112 cleavage plane of Cd3As2 now reveal its electronic structure down to atomic length scales, as well as its Landau spectrum and quasiparticle interference pattern.

    • Sangjun Jeon
    • , Brian B. Zhou
    •  & Ali Yazdani

  • Letter |

    A state of matter known as a three-dimensional Dirac semimetal has latterly garnered significant theoretical and experimental attention. Using angle-resolved photoelectron spectroscopy, it is shown that Cd3As2 is an experimental realization of a three-dimensional Dirac semimetal that is stable at ambient conditions.

    • Z. K. Liu
    • , J. Jiang
    •  & Y. L. Chen

  • Letter |

    The surface electronic states associated with topological insulators have attracted considerable attention due to their robust nature. Using low-field susceptibility measurements, a paramagnetic singularity that is common to the (Bi,Sn)2(Se,Te)3 family of topological insulators is observed, and explained in terms of the topological surface states.

    • Lukas Zhao
    • , Haiming Deng
    •  & Lia Krusin-Elbaum

  • Article |

    Heterostructures consisting of ferromagnets and heavy metals have become a focus of interest because their strong spin–orbit coupling allows for efficient current-induced magnetization switching phenomena. Now, a magnetically doped topological insulator bilayer is shown to display a range of appealing characteristics for current-induced magnetization switching, including a significantly enhanced efficiency.

    • Yabin Fan
    • , Pramey Upadhyaya
    •  & Kang L. Wang

  • Letter |

    Samarium hexaboride has recently come under examination as a possible topological insulator. Transport measurements investigating the effects of magnetic impurities on this system uncover characteristics that are consistent with topologically insulating behaviour, and reveal a strongly suppressed bulk conductivity.

    • D. J. Kim
    • , J. Xia
    •  & Z. Fisk

  • Letter |

    Quantum wells based on mercury telluride are an experimental realization of a two-dimensional topological insulator. By using a scanning superconducting quantum interference device (SQUID) technique, the magnetic fields flowing through HgTe/CdTe heterostructures are imaged both in the quantum spin Hall and the trivial regimes, revealing the edge states associated with the quantum spin Hall state.

    • Katja C. Nowack
    • , Eric M. Spanton
    •  & Kathryn A. Moler

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