Volume 10 Issue 3, March 2014

Volume 10 Issue 3

Superconductivity in iron pnictides seems to be related to the formation of electronic nematic phases that break the rotational symmetry of the crystal lattice. But the nematic phase in NaFeAs is now shown to persist at high temperatures owing to the presence of antiferroic fluctuations. Article p225; News & Views p184IMAGE: E.P. ROSENTHAL AND CHRISTOPHER GUTIÉRREZCOVER DESIGN: ALLEN BEATTIE

Editorial

  • Editorial |

    An ambitious programme to achieve power generation from nuclear fusion is making some progress, at last.

Correspondence

Thesis

Research Highlights

News and Views

  • News & Views |

    Comparisons between classically simulated models and the actual performance of a 100-qubit D-Wave processor stimulate, but do not settle, the debate about how quantum annealing really works.

    • Dan Browne
  • News & Views |

    The Dzyaloshinskii–Moriya interaction — the mechanism behind weak ferromagnetism — has been difficult to probe experimentally. Now, significant progress is reported that has important implications for a wide range of magnetic phenomena.

    • Chong Der Hu
  • News & Views |

    A recent experiment shows that graphene nanoribbons can be grown to be perfect conductors where electrons travel long distances without coming across a single obstacle.

    • Juan José Palacios
  • News & Views |

    Iron pnictide superconductors often feature nematic, symmetry-breaking electronic states. These phenomena are now found to persist into the tetragonal phase of NaFeAs — a new piece of information that may help settle the fundamental origin of nematic electronic states.

    • J. C. Davis
    •  & P. J. Hirschfeld
  • News & Views |

    Disks interacting via particular potentials self-organize into triangles that stabilize mosaics with 10-, 12-, 18- and 24-fold symmetry, as revealed by computer simulations. Discoveries of further novel quasicrystals may now be within reach.

    • Michael Engel
    •  & Sharon C. Glotzer
  • News & Views |

    The back-action of a weak measurement on the electron spin of a nitrogen–vacancy centre in diamond can be used to steer the associated nuclear spin towards a desired state.

    • Victor M. Acosta

Letters

  • Letter |

    Quantum critical behaviour has been observed in many metallic systems that do not behave conventionally as Fermi liquids. High-magnetic-field experiments now reveal clear evidence for quantum criticality in an iron-based high-temperature superconductor.

    • James G. Analytis
    • , H-H. Kuo
    • , Ross D. McDonald
    • , Mark Wartenbe
    • , P. M. C. Rourke
    • , N. E. Hussey
    •  & I. R. Fisher
  • Letter |

    The physics of one-dimensional many-body systems is rich but still insufficiently understood. An ultracold atom experiment investigates the behaviour of one-dimensional strongly correlated fermions with a tunable number of spin components.

    • Guido Pagano
    • , Marco Mancini
    • , Giacomo Cappellini
    • , Pietro Lombardi
    • , Florian Schäfer
    • , Hui Hu
    • , Xia-Ji Liu
    • , Jacopo Catani
    • , Carlo Sias
    • , Massimo Inguscio
    •  & Leonardo Fallani
  • Letter |

    Oxygen-mediated superexchange (or Dzyaloshinskii–Moriya) interactions result in weak ferromagnetism in oxides. A method based on the interference of synchrotron X-ray radiation is now shown to enable the determination of the sign of the Dzyaloshinskii–Moriya interaction in the prototypical weak ferromagnet iron borate.

    • V. E. Dmitrienko
    • , E. N. Ovchinnikova
    • , S. P. Collins
    • , G. Nisbet
    • , G. Beutier
    • , Y. O. Kvashnin
    • , V. V. Mazurenko
    • , A. I. Lichtenstein
    •  & M. I. Katsnelson
  • Letter |

    To better understand the mechanisms of double ionization following the absorption of one photon, a combination of experimental techniques has been developed to probe the electron emission times in xenon on the attosecond timescale.

    • Erik P. Månsson
    • , Diego Guénot
    • , Cord L. Arnold
    • , David Kroon
    • , Susan Kasper
    • , J. Marcus Dahlström
    • , Eva Lindroth
    • , Anatoli S. Kheifets
    • , Anne L’Huillier
    • , Stacey L. Sorensen
    •  & Mathieu Gisselbrecht
  • Letter |

    Bacteria often reside in fluids. Now, it is shown that hydrodynamic shear, which creates forces and torques on bacterial suspensions, stimulates the attachment of bacteria to surfaces and seriously hinders chemotaxis.

    • Roberto Rusconi
    • , Jeffrey S. Guasto
    •  & Roman Stocker

Articles

  • Article |

    Quantum annealing is expected to solve certain optimization problems more efficiently, but there are still open questions regarding the functioning of devices such as D-Wave One. A numerical and experimental investigation of its performance shows evidence for quantum annealing with 108 qubits.

    • Sergio Boixo
    • , Troels F. Rønnow
    • , Sergei V. Isakov
    • , Zhihui Wang
    • , David Wecker
    • , Daniel A. Lidar
    • , John M. Martinis
    •  & Matthias Troyer
  • Article |

    Superconductivity in iron pnictides seems to be related to the formation of electronic nematic phases that break the rotational symmetry of the crystal lattice. But the nematic phase in NaFeAs is now shown to persist at high temperatures owing to the presence of antiferroic fluctuations.

    • E. P. Rosenthal
    • , E. F. Andrade
    • , C. J. Arguello
    • , R. M. Fernandes
    • , L. Y. Xing
    • , X. C. Wang
    • , C. Q. Jin
    • , A. J. Millis
    •  & A. N. Pasupathy
  • Article |

    Graphene and topological-insulator surfaces are well known for their two-dimensional conic electronic dispersion relation. Now three-dimensional hyperconic dispersion is shown for electrons in a HgCdTe crystal—once again bridging solid-state physics and quantum electrodynamics.

    • M. Orlita
    • , D. M. Basko
    • , M. S. Zholudev
    • , F. Teppe
    • , W. Knap
    • , V. I. Gavrilenko
    • , N. N. Mikhailov
    • , S. A. Dvoretskii
    • , P. Neugebauer
    • , C. Faugeras
    • , A-L. Barra
    • , G. Martinez
    •  & M. Potemski

Futures