Volume 4 Issue 8, August 2008

Volume 4 Issue 8

Emission coherence is crucial to the potential of future X-ray sources based on high-order harmonic generation from laser-driven plasmas. A demonstration of the interference between three highorder harmonic beams produced from a plasma mirror proves that such coherence is possible, but only if the laser pulses that drive them are temporally sharp. Letter p631

Cover design by David Shand

Editorial

  • Editorial |

    After almost three decades of preparation, CERN's Large Hadron Collider is turning on.

Thesis

Books and Arts

Research Highlights

News and Views

Research Article

  • Research Article |

    The ability to control the velocity of molecules using time-varying electrical and magnetic fields has led to a renewed interest in molecular beams. This article reviews the technology of these decelerators and discusses applications.

    • Sebastiaan Y. T. van de Meerakker
    • , Hendrick L. Bethlem
    •  & Gerard Meijer

Letters

  • Letter |

    A long-sought ytterbium-based heavy-fermion superconductor—a hole analogue of the cerium-based systems—has been found. Moreover, there is evidence for a quantum critical point at ambient conditions and without chemical doping.

    • S. Nakatsuji
    • , K. Kuga
    • , Y. Machida
    • , T. Tayama
    • , T. Sakakibara
    • , Y. Karaki
    • , H. Ishimoto
    • , S. Yonezawa
    • , Y. Maeno
    • , E. Pearson
    • , G. G. Lonzarich
    • , L. Balicas
    • , H. Lee
    •  & Z. Fisk
  • Letter |

    A superconducting qubit—a mesoscopic structure that behaves like a quantum two-level system—has been used to change the temperature of a resonant circuit, in close analogy to the so-called Sisyphus cooling and amplification protocols used in laser cooling of atoms.

    • M. Grajcar
    • , S. H. W. van der Ploeg
    • , A. Izmalkov
    • , E. Il’ichev
    • , H.-G. Meyer
    • , A. Fedorov
    • , A. Shnirman
    •  & Gerd Schön
  • Letter |

    A rich internal structure and long-range interactions between them make molecules with non-vanishing dipole moments interesting for many applications. An experiment demonstrating the efficient transfer of loosely bound heteronuclear molecules into more deeply bound energy levels indicates a route towards producing dense ensembles of cold polar molecules.

    • S. Ospelkaus
    • , A. Pe’er
    • , K.-K. Ni
    • , J. J. Zirbel
    • , B. Neyenhuis
    • , S. Kotochigova
    • , P. S. Julienne
    • , J. Ye
    •  & D. S. Jin
  • Letter |

    Emission coherence is crucial to the potential of future X-ray sources based on high-order harmonic generation from laser-driven plasmas. Contrary to expectations, coherent emission is possible, but only if the pulses driving it are temporally sharp.

    • C. Thaury
    • , H. George
    • , F. Quéré
    • , R. Loch
    • , J.-P. Geindre
    • , P. Monot
    •  & Ph. Martin
  • Letter |

    The use of a quantum point contact to detect the thermal motion of a nearby microcantilever demonstrates a potentially useful tool in the quest to push the sensitivity of displacement sensors to the ultimate quantum limit.

    • M. Poggio
    • , M. P. Jura
    • , C. L. Degen
    • , M. A. Topinka
    • , H. J. Mamin
    • , D. Goldhaber-Gordon
    •  & D. Rugar

Articles

  • Article |

    Unconventional superconductors often host two or more competing states at low temperatures. Line defects seemingly have a role in the relative stability of coexisting density waves that oscillate in space.

    • D. F. Agterberg
    •  & H. Tsunetsugu
  • Article |

    The Kondo problem—dealing with localized magnetic impurities embedded in a sea of conduction electrons—can be treated on an equal footing with superconductivity for a large system of interacting electrons.

    • Rebecca Flint
    • , M. Dzero
    •  & P. Coleman
  • Article |

    Similar to electrons passed through a double-slit apparatus, photoelectrons emitted coherently from both atoms of a diatomic molecule can exhibit interference patterns. But when coherence between the two atoms is lost, effects are shown to come into play that are unique to the ‘molecular double-slit’ experiment.

    • Björn Zimmermann
    • , Daniel Rolles
    • , Burkhard Langer
    • , Rainer Hentges
    • , Markus Braune
    • , Slobodan Cvejanovic
    • , Oliver Geßner
    • , Franz Heiser
    • , Sanja Korica
    • , Toralf Lischke
    • , Axel Reinköster
    • , Jens Viefhaus
    • , Reinhard Dörner
    • , Vincent McKoy
    •  & Uwe Becker
  • Article |

    The ability to change the degree of hybridization of a donor electron state between the coulombic potential of its donor atom and that of a nearby quantum well in a silicon transistor has now been achieved. This is a promising step in the development of atomic-scale quantum control.

    • G. P. Lansbergen
    • , R. Rahman
    • , C. J. Wellard
    • , I. Woo
    • , J. Caro
    • , N. Collaert
    • , S. Biesemans
    • , G. Klimeck
    • , L. C. L. Hollenberg
    •  & S. Rogge

Futures

Corrigendum