Volume 10 Issue 11, November 2014

Volume 10 Issue 11

Quantum technologies are extremely sensitive to environmental disturbance. Control techniques inspired by classical systems engineering allow selective filtering of the noise spectrum, suppressing time-varying noise over defined frequency bands.Letter p825; News & Views p794 IMAGE: HARRISON BALL AND MICHAEL J. BIERCUK COVER DESIGN: ALLEN BEATTIE

Editorial

  • Editorial |

    Many people around the world will remember 2014 as the year Brazil hosted the football World Cup. But for Brazil's science communities, the decisions made by the new government could leave scars much deeper than the semi-final defeat.

Thesis

Books and Arts

Research Highlights

News and Views

  • News & Views |

    Astrophysical observations of Hawking radiation may be out of reach, but evidence for the self-amplification of Hawking radiation has now been observed in a sonic analogue of a black hole.

    • Giovanni Modugno
  • News & Views |

    Rapidly changing noise impedes high-fidelity quantum control. An engineering framework for predicting and mitigating such dynamics has now been validated, revealing physical insights into the time evolution of quantum states.

    • William D. Oliver
  • News & Views |

    A microcavity device operating in the strong light–matter interaction regime can produce coherent perfect absorption of photons — providing a viable system for the perfect feeding of polaritons.

    • Cristiano Ciuti
  • News & Views |

    The ability to harness spin polarization is critical for many semiconductor spin devices. It now seems that spin–orbit coupling with locally broken symmetry can enable a giant spin polarization in a semiconductor that is otherwise inversion symmetric.

    • John Schaibley
    •  & Xiaodong Xu
  • News & Views |

    Plasmons offer the tantalizing prospect of accelerated light–matter interactions. Accelerated dynamics has now been observed in a hybrid plasmonic laser or spaser, capable of producing pulses on ultrafast timescales.

    • Mark Stockman
  • News & Views |

    Laser control of atomic ions through dipole-forbidden transitions has provided a way of probing quantum mechanics. These transitions have now been observed in molecular ions, opening the door to a new generation of spectroscopy experiments.

    • Jeroen C. J. Koelemeij

Review

  • Review Article |

    Exciton–polaritons, resulting from the light–matter coupling between an exciton and a photon in a cavity, form Bose–Einstein-like condensates above a critical density. Various aspects of the physics of exciton–polariton condensates are now reviewed.

    • Tim Byrnes
    • , Na Young Kim
    •  & Yoshihisa Yamamoto

Letters

  • Letter |

    Quantum technologies are extremely sensitive to environmental disturbance. Control techniques inspired by classical systems engineering allow selective filtering of the noise spectrum, suppressing time-varying noise over defined frequency bands.

    • A. Soare
    • , H. Ball
    • , D. Hayes
    • , J. Sastrawan
    • , M. C. Jarratt
    • , J. J. McLoughlin
    • , X. Zhen
    • , T. J. Green
    •  & M. J. Biercuk
  • Letter |

    The absorption properties of a resonator can be tuned by varying the phase between incoming coherent light beams. Such control is now shown under strong coupling conditions, allowing all incoming energy to be converted into polaritons.

    • Simone Zanotto
    • , Francesco P. Mezzapesa
    • , Federica Bianco
    • , Giorgio Biasiol
    • , Lorenzo Baldacci
    • , Miriam Serena Vitiello
    • , Lucia Sorba
    • , Raffaele Colombelli
    •  & Alessandro Tredicucci
  • Letter |

    The coupling between spin, valley and layer degrees of freedom in transition-metal dichalcogenides is shown to give rise to spin-polarized electron states, providing opportunities to create and manipulate spin and valley polarizations in bulk solids.

    • J. M. Riley
    • , F. Mazzola
    • , M. Dendzik
    • , M. Michiardi
    • , T. Takayama
    • , L. Bawden
    • , C. Granerød
    • , M. Leandersson
    • , T. Balasubramanian
    • , M. Hoesch
    • , T. K. Kim
    • , H. Takagi
    • , W. Meevasana
    • , Ph. Hofmann
    • , M. S. Bahramy
    • , J. W. Wells
    •  & P. D. C. King
  • Letter |

    Nuclear magnetic resonance measurements reveal two separate relaxation channels—one associated with a Fermi liquid state and the other with a non-Fermi liquid state—coexisting near a quantum phase transition in YbRh2Si2.

    • S. Kambe
    • , H. Sakai
    • , Y. Tokunaga
    • , G. Lapertot
    • , T. D. Matsuda
    • , G. Knebel
    • , J. Flouquet
    •  & R. E. Walstedt

Articles

  • Article |

    Spin relaxation in graphene is much faster than theoretically expected. Now, a scenario based on a mixing of spin and pseudospin degrees of freedom and defect-induced spatial spin–orbit coupling variations predicts longer spin relaxation times.

    • Dinh Van Tuan
    • , Frank Ortmann
    • , David Soriano
    • , Sergio O. Valenzuela
    •  & Stephan Roche
  • Article |

    Electron scattering limits the optical excitations produced by metal-based lasers to femtosecond timescales. But sub-picosecond pulsing can be achieved in a plasmonic nanowire laser by operating near the surface plasmon frequency.

    • Themistoklis P. H. Sidiropoulos
    • , Robert Röder
    • , Sebastian Geburt
    • , Ortwin Hess
    • , Stefan A. Maier
    • , Carsten Ronning
    •  & Rupert F. Oulton
  • Article |

    Cuprate superconductors are created by adding electrons or holes to a ‘parent’ compound. They have dissimilar phase diagrams and the asymmetry is further highlighted by unexpected collective modes measured using resonant inelastic X-ray scattering.

    • W. S. Lee
    • , J. J. Lee
    • , E. A. Nowadnick
    • , S. Gerber
    • , W. Tabis
    • , S. W. Huang
    • , V. N. Strocov
    • , E. M. Motoyama
    • , G. Yu
    • , B. Moritz
    • , H. Y. Huang
    • , R. P. Wang
    • , Y. B. Huang
    • , W. B. Wu
    • , C. T. Chen
    • , D. J. Huang
    • , M. Greven
    • , T. Schmitt
    • , Z. X. Shen
    •  & T. P. Devereaux

Futures

  • Futures |

    Alone — but not lonely.

    • Sylvia Spruck Wrigley