Nature Physics July Issue

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TABLE OF CONTENTS July 2016 Volume 12, Issue 7 Editorial Commentaries Thesis Correction Research Highlights News and Views Progress Article Letters Articles Corrigendum Erratum Measure for Measure Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement Nature Publishing Group offers a free open access funding support service to enable authors to discover and apply for article processing charge funding available to them. Visit our website for further advice on the funding options available, and guidance in approaching funders and institutions, or email openaccess@nature.com for more information.     Focus on Topological matter Topology has returned to prominence in physics thanks to the discovery of topological insulators — a class of materials that are characterized by topological properties. This Focus showcases the recent advances in realizing and exploiting topological phases in condensed matter and beyond. Focus Topological matter Editorial Top Focus on Topological matter Topology on top   p615 doi:10.1038/nphys3827 Topology has journeyed from the purely mathematical arena to feature throughout physics. Commentaries Top Focus on Topological matter Space, matter and topology   pp616 - 618 Manuel Asorey doi:10.1038/nphys3800 An old branch of mathematics has paved the way for discovering new phases of matter. Focus on Topological matter A road to reality with topological superconductors   pp618 - 621 Carlo Beenakker and Leo Kouwenhoven doi:10.1038/nphys3778 Topological matter can host low-energy quasiparticles, which, in a superconductor, are Majorana fermions described by a real wavefunction. The absence of complex phases provides protection for quantum computations based on topological superconductivity. Focus on Topological matter Topological mechanics   pp621 - 623 Sebastian D. Huber doi:10.1038/nphys3801 Electronic topological insulators have inspired the design of new mechanical systems that could soon find real-life applications. Focus on Topological matter Quasiperiodicity and topology transcend dimensions   pp624 - 626 Yaacov E. Kraus and Oded Zilberberg doi:10.1038/nphys3784 The topological state of matter depends on its dimension. Remarkably, topological properties of quasiperiodic systems are found to emerge from higher dimensions. Focus on Topological matter Topological states in photonic systems   pp626 - 629 Ling Lu, John D. Joannopoulos and Marin Soljačić doi:10.1038/nphys3796 Optics played a key role in the discovery of geometric phase. It now joins the journey of exploring topological physics, bringing bosonic topological states that equip us with the ability to make perfect photonic devices using imperfect interfaces. Thesis Top Digital science   p630 Mark Buchanan doi:10.1038/nphys3815 Correction Top Correction   p631 doi:10.1038/nphys3814 See also: Research Highlights by Fleet Research Highlights Top Complex networks: Same on the inside | Exoplanets: Waterworld of difference | Quantum simulation: The power of many | Topological phases: Impurities for sensors | Neutrino physics: Limits of coherence News and Views Top Magnetic adatoms: When Ising meets Majorana   pp633 - 634 Frédéric Mila doi:10.1038/nphys3751 The topological degeneracy associated with Majorana edge states has been measured in a spin-1/2 chain of cobalt atoms, thereby opening new avenues in low-dimensional quantum magnetism. See also: Letter by Toskovic et al. Quantum dots: Nuclear spins get a comb-over   pp634 - 635 Jeroen Elzerman and Mark Buitelaar doi:10.1038/nphys3747 A frequency comb technique used in NMR spectroscopy reveals the dynamics of the nuclear spin bath in self-assembled quantum dots. See also: Letter by Waeber et al. Star formation: Why dwarf galaxies come up short   pp636 - 637 Desika Narayanan doi:10.1038/nphys3807 When it comes to star formation, dwarf galaxies perform very poorly. A possible explanation for this behaviour involves photoelectric electrons heating the star-forming gas. Quantum measurement: Coping with pressure   pp637 - 638 James S. Bennett and Warwick P. Bowen doi:10.1038/nphys3753 Radiation pressure noise from squeezed light constrains the precision of sensing devices such as improved gravitational wave interferometers. See also: Letter by Clark et al. Physics JOBS of the week Tenure Stream Assistant or Associate Professor Position Department of Physics and Atmospheric Science Dalhousie University Postdoctoral Fellow in microfluidics (applied physics and automation) Institute of Physical Chemistry of the Polish Academy of Sciences Research Fellow in the Field of Condensed Matter Theory / Solid State Physics TU Dresden More Science jobs from Physics EVENT 11th International Conference On Physics Of Advanced Materials (ICPAM-11) 08.09.16 Cluj-Napoca, Romania More science events from Progress Article Top Focus on Topological matter Topological quantum matter with ultracold gases in optical lattices   pp639 - 645 N. Goldman, J. C. Budich and P. Zoller doi:10.1038/nphys3803 Using optical lattices to trap ultracold atoms provides a powerful platform for probing topological phases, analogues to those found in condensed matter. But as these systems are highly tunable, they could be used to engineer even more exotic phases. Letters Top Probing the Bose glass-superfluid transition using quantum quenches of disorder   pp646 - 649 Carolyn Meldgin, Ushnish Ray, Philip Russ, David Chen, David M. Ceperley et al. doi:10.1038/nphys3695 Aspects of the disordered Bose-Hubbard model, such as the Bose glass-superfluid transition, are still incompletely understood, but this can now be probed in an ultracold atomic gas in an optical lattice using controlled quantum quenches of disorder. How superfluid vortex knots untie   pp650 - 655 Dustin Kleckner, Louis H. Kauffman and William T. M. Irvine doi:10.1038/nphys3679 The stability of a large class of elemental knots and links to so-called reconnections is studied numerically using the Gross-Pitaevskii model for a superfluid, demonstrating that they universally untie. Atomic spin-chain realization of a model for quantum criticality   pp656 - 660 R. Toskovic, R. van den Berg, A. Spinelli, I. S. Eliens, B. van den Toorn et al. doi:10.1038/nphys3722 Magnetic adatoms offer an appealing platform for building idealized spin models, but achieving sufficient control to do so is challenging. Now, arrays of Co atoms evaporated on a Cu2N/Cu(100) surface are shown to behave like a spin-1/2 XXZ Heisenberg chain. See also: News and Views by Mila Experimental signature of the attractive Coulomb force between positive and negative magnetic monopoles in spin ice   pp661 - 666 C. Paulsen, S. R. Giblin, E. Lhotel, D. Prabhakaran, G. Balakrishnan et al. doi:10.1038/nphys3704 A magnetic analogue of the Poole-Frenkel effect shows that magnetic monopole quasiparticles in a spin ice behave similar to electrons in a semiconductor, with an attractive Coulomb force acting between positive and negative monopoles. Dirac node arcs in PtSn4   pp667 - 671 Yun Wu, Lin-Lin Wang, Eundeok Mun, D. D. Johnson, Daixiang Mou et al. doi:10.1038/nphys3712 A combination of detailed photoelectron spectroscopy measurements and numerical simulations reveal the presence of so-called Dirac node arcs in the electronic structure of PtSn4. Electron viscosity, current vortices and negative nonlocal resistance in graphene   pp672 - 676 Leonid Levitov and Gregory Falkovich doi:10.1038/nphys3667 In analogy to fluids, electric currents can exhibit viscosity — albeit with effects difficult to observe experimentally. Now, vorticity is reported as a signature feature of electron viscosity in graphene, which leads to negative nonlocal resistance. Direct measurement of exciton valley coherence in monolayer WSe2   pp677 - 682 Kai Hao, Galan Moody, Fengcheng Wu, Chandriker Kavir Dass, Lixiang Xu et al. doi:10.1038/nphys3674 Coherent valley exciton dynamics are directly probed in a monolayer transition metal dichalcogenide, providing access to the valley coherence time and decoherence mechanisms — crucial for developing methods for manipulating the valley pseudospin. Observation of strong radiation pressure forces from squeezed light on a mechanical oscillator   pp683 - 687 Jeremy B. Clark, Florent Lecocq, Raymond W. Simmonds, José Aumentado and John D. Teufel doi:10.1038/nphys3701 Non-classical states of light, such as squeezed states, are used in quantum metrology to improve the sensitivity of mechanical motion sensing, but conversely mechanical oscillations can enhance the measurement of squeezed light. See also: News and Views by Bennett & Bowen Few-second-long correlation times in a quantum dot nuclear spin bath probed by frequency-comb nuclear magnetic resonance spectroscopy   pp688 - 693 A. M. Waeber, M. Hopkinson, I. Farrer, D. A. Ritchie, J. Nilsson et al. doi:10.1038/nphys3686 Using a frequency-comb nuclear magnetic resonance spectroscopy technique it is possible to probe the fluctuations in the nuclear spin bath of a self-assembled quantum dot and reveal long nuclear spin correlation times over one second. See also: News and Views by Elzerman & Buitelaar Collective magnetic response of CeO2 nanoparticles   pp694 - 699 Michael Coey, Karl Ackland, Munuswamy Venkatesan and Siddhartha Sen doi:10.1038/nphys3676 The magnetic response of nanoparticles made from wide-bandgap oxides that don't contain any magnetic cations is somewhat of a mystery. Experiments with CeO2 suggest that the origin may be due to vacuum fluctuations. Protein folding trajectories can be described quantitatively by one-dimensional diffusion over measured energy landscapes   pp700 - 703 Krishna Neupane, Ajay P. Manuel and Michael T. Woodside doi:10.1038/nphys3677 Multidimensional protein-folding dynamics are often probed experimentally by projecting into a single dimension. Single-molecule experiments now verify the idea that folding can be understood in terms of one-dimensional diffusion over a landscape. Advertisement Nature Chemistry in the community Nature Chemistry is now on Facebook. Like our page to keep up to date with developments in the field and links to the latest research.     Articles Top Size-dependent protein segregation at membrane interfaces   pp704 - 711 Eva M. Schmid, Matthew H. Bakalar, Kaushik Choudhuri, Julian Weichsel, Hyoung Sook Ann et al. doi:10.1038/nphys3678 Segregation between binding and non-binding proteins in the space between cells is critical for immune response. In vitro experiments show that size alone suffices to explain the exclusion of non-binding proteins from membrane interfaces. Correlation between dynamical and structural heterogeneities in colloidal hard-sphere suspensions   pp712 - 717 Sebastian Golde, Thomas Palberg and Hans Joachim Schope doi:10.1038/nphys3709 Experiments combining dynamic and static light scattering have probed a colloidal hard-sphere system for the formation of dynamical and structural heterogeneities, which play a role in both forms of solidification: crystallization and vitrification. Corrigendum Top Corrigendum: Inertial-confinement fusion with lasers   p717 R. Betti and O. A. Hurricane doi:10.1038/nphys3802 See also: Review by Betti & Hurricane Erratum Top Erratum: Magnetic-confinement fusion   p717 J. Ongena, R. Koch, R. Wolf and H. Zohm doi:10.1038/nphys3818 See also: Review by Ongena et al. Measure for Measure Top How wet can you get?   p718 Philip Ball doi:10.1038/nphys3811 Some concepts are useful but difficult to quantify, as Philip Ball illustrates with the property of hydrophobicity. Top Advertisement Microsystems & Nanoengineering is a fully open access, peer-reviewed journal, which publishes original articles and reviews on cutting-edge and emerging topics related to MEMS/ NEMS and nanotechnology. Submit your manuscript.   Natureevents is a fully searchable, multi-disciplinary database designed to maximise exposure for events organisers. The contents of the Natureevents Directory are now live. The digital version is available here. Find the latest scientific conferences, courses, meetings and symposia on natureevents.com. For event advertising opportunities across the Nature Publishing Group portfolio please contact natureevents@nature.com More Nature Events

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