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Current Issue of Nature


Current Issue : Nature

Current Issue

Volume 543 Number 7644 pp152-280

9 March 2017

About the cover

The cover shows an artist’s impression of time crystals. Much like ordinary crystals, time crystals exhibit a high degree of structural order. But whereas ordinary crystals get their periodicity from the regular repetition of spatial elements, time crystals are an exotic state of matter in which the same structures repeat themselves in time. Predicted to exist a few years ago, time crystals have so far resisted experimental demonstration. Now, two groups offer evidence for experimental observation of this elusive form of matter. Mikhail Lukin et al. have produced a discrete time crystal using a nitrogen–vacancy system in diamond as an experimental platform. In a complementary paper, Jiehang Zhang et al. achieve a similar feat using trapped ions. Such time crystals could potentially find applications in robust quantum memory. Cover artwork: Peter Crowther

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Letters

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  • Observation of a discrete time crystal

    • J. Zhang
    • P. W. Hess
    • A. Kyprianidis
    • P. Becker
    • A. Lee
    • J. Smith
    • G. Pagano
    • I.-D. Potirniche
    • A. C. Potter
    • A. Vishwanath
    • N. Y. Yao
    • C. Monroe

    A time crystal is a state of matter that shows robust oscillations in time, and although forbidden in equilibrium, a discrete time crystal has now been observed in a periodically driven quantum system.

    See also
    See also
  • Observation of discrete time-crystalline order in a disordered dipolar many-body system

    • Soonwon Choi
    • Joonhee Choi
    • Renate Landig
    • Georg Kucsko
    • Hengyun Zhou
    • Junichi Isoya
    • Fedor Jelezko
    • Shinobu Onoda
    • Hitoshi Sumiya
    • Vedika Khemani
    • Curt von Keyserlingk
    • Norman Y. Yao
    • Eugene Demler
    • Mikhail D. Lukin

    Discrete time-crystalline order is observed in a driven, disordered ensemble of about one million dipolar spin impurities in diamond at room temperature, and is shown to be very stable to perturbations.

    See also
    See also
  • Reading and writing single-atom magnets

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    A two-bit magnetic memory is demonstrated, based on the magnetic states of individual holmium atoms, which are read and written in a scanning tunnelling microscope set-up and are stable over many hours.

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    • Deming Liu
    • Zhiguang Zhou
    • Chenshuo Ma
    • Jiajia Zhou
    • James A. Piper
    • Peng Xi
    • Dayong Jin

    Super-resolution optical microscopy based on stimulated emission depletion effects can now be performed at much lower light intensities than before by using bright upconversion emission from thulium-doped nanoparticles.

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    • Daniel P. LePage
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    • Jungmin On
    • Jessamyn I. Perlmutter
    • J. Dylan Shropshire
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    • John F. Beckmann
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    • Norbert Pardi
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  • Survival of tissue-resident memory T cells requires exogenous lipid uptake and metabolism

    • Youdong Pan
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    • Yagmur Turgay
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    • Kfir Ben-Harush
    • Anna Dubrovsky-Gaupp
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    • Robert D. Goldman
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  • ENL links histone acetylation to oncogenic gene expression in acute myeloid leukaemia

    • Liling Wan
    • Hong Wen
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    • Julia K. Joseph
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    The chromatin-reader protein ENL regulates oncogenic programs in acute myeloid leukaemia by binding via its YEATS domain to acetylated histones on the promoters of actively transcribed genes and recruiting the transcriptional machinery.

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  • Transcription control by the ENL YEATS domain in acute leukaemia

    • Michael A. Erb
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    • Bin E. Li
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    • Amanda Souza
    • Justin M. Roberts
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    ENL, identified in a genome-scale loss-of-function screen as a crucial requirement for proliferation of acute leukaemia, is required for leukaemic gene expression, and its YEATS chromatin-reader domain is essential for leukaemic growth.

    See also
    See also