Nature Materials contents: April 2015 Volume 14 Number 4 pp 361-452

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TABLE OF CONTENTS April 2015 Volume 14, Issue 4 Editorial Research Highlights News and Views Letters Articles Corrigendum Advertisement   Ready for a glimpse of tomorrow? Visit KAUST Discovery today   KAUST Discovery highlights the cutting-edge research, technologies and innovations emerging from the King Abdullah University of Science and Technology.   http://discovery.kaust.edu.sa  Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement Tiny treasure: The future of nano-gold Watch this new Animation from Nature Nanotechnology and access Nature Outlook Gold free online for another six months.  Produced with support from:  World Gold Council      Editorial Top Physics gets its hands dirty   p361 doi:10.1038/nmat4268 Is condensed-matter physics becoming more materials-oriented? Or is this just a new wrinkle in an old tradition? Research Highlights Top Metal–organic frameworks: Crystals and chains | Superconductivity: Switched by light | Solute strengthening: How to pin a screw | Gallium nitride growth: A 2D barrier to defects | Optics: Flat lenses News and Views Top Water-based metamaterials: Negative refraction of sound   pp363 - 364 Bogdan-Ioan Popa & Steven A. Cummer doi:10.1038/nmat4253 Porous rubber microbeads suspended in a gel are found to exhibit a negative acoustic index of refraction, which makes these metamaterials promising for underwater acoustic applications. See also: Letter by Brunet et al. Van der Waals heterostructures: Mid-infrared nanophotonics   pp364 - 366 Joshua D. Caldwell & Kostya S. Novoselov doi:10.1038/nmat4252 The confinement and scattering lifetimes of graphene plasmons are improved when graphene is sandwiched between layers of thin hexagonal boron nitride. This finding should pave the way for nanophotonic applications in the low-loss regime. See also: Article by Woessner et al. Origami: Folding creases through bending   pp366 - 368 Talal Al-Mulla & Markus J. Buehler doi:10.1038/nmat4258 The folding of origami structures involves bending deformations that are not explicit in the crease pattern. See also: Letter by Silverberg et al. Colloidal self-assembly: Programmable competitive binding   p368 Pep Pàmies doi:10.1038/nmat4265 Biomineralization: Ion binding and nucleation   pp369 - 370 Roland Kröger doi:10.1038/nmat4256 The visualization of organic-acid-induced crystal growth by means of liquid-cell transmission electron microscopy can provide key insights into the nucleation of calcium carbonate in an organic matrix. See also: Letter by Smeets et al. Nanolasers: Lasing from 2D atomic crystals   pp370 - 371 Vinod Menon doi:10.1038/nmat4255 The coupling of monolayer tungsten diselenide and a photonic-crystal cavity leads to ultralow-threshold lasing. Material witness: The Turing touch test   p371 Philip Ball doi:10.1038/nmat4257 Nature Materials JOBS of the week Technologist position on Functional Materials for Biorobotics Istituto Italiano di Tecnologia (IIT) 3-years PhD in "Computer Simulation of Energy Conversion Phenomena in Complex Oxide Materials" University of New South Wales Associate Research Fellow University of Exeter Ph.D. position in Magnetic Materials “Development of spin-orbit-coupling metallic magnets” ETH Zurich More Science jobs from Nature Materials EVENT International Conference on Diamond and Carbon Materials 2015 06.09.15 Homburg, Germany More science events from Letters Top Field-tunable spin-density-wave phases in Sr3Ru2O7   pp373 - 378 C. Lester, S. Ramos, R. S. Perry, T. P. Croft, R. I. Bewley, T. Guidi, P. Manuel, D. D. Khalyavin, E. M. Forgan & S. M. Hayden doi:10.1038/nmat4181 The application of a high magnetic field is shown to induce spin-density-wave order in Sr3Ru2O7. This magnetic order correlates with the electronic nematic behaviour observed in this material. Predicting nonlinear properties of metamaterials from the linear response   pp379 - 383 Kevin O'Brien, Haim Suchowski, Junsuk Rho, Alessandro Salandrino, Boubacar Kante, Xiaobo Yin & Xiang Zhang doi:10.1038/nmat4214 Nonlinear scattering theory, contrary to Miller's rule, is shown to be able to establish the nonlinear optical response of metamaterials, a tool that can be used towards the efficient design of strongly nonlinear metamaterials. Soft 3D acoustic metamaterial with negative index   pp384 - 388 Thomas Brunet, Aurore Merlin, Benoit Mascaro, Kevin Zimny, Jacques Leng, Olivier Poncelet, Christophe Aristégui & Olivier Mondain-Monval doi:10.1038/nmat4164 Soft acoustic metamaterials that consist of a concentrated suspension of macroporous microbeads and that show a broadband negative acoustic refractive index are now demonstrated. See also: News and Views by Popa & Cummer Origami structures with a critical transition to bistability arising from hidden degrees of freedom   pp389 - 393 Jesse L. Silverberg, Jun-Hee Na, Arthur A. Evans, Bin Liu, Thomas C. Hull, Christian D. Santangelo, Robert J. Lang, Ryan C. Hayward & Itai Cohen doi:10.1038/nmat4232 The square-twist origami structure, believed to have a non-foldable crease pattern, is now shown to be foldable through bending deformations that are not explicit in the pattern and that lead to a transition between mechanical mono- and bistability. See also: News and Views by Al-Mulla & Buehler Calcium carbonate nucleation driven by ion binding in a biomimetic matrix revealed by in situ electron microscopy   pp394 - 399 Paul J. M. Smeets, Kang Rae Cho, Ralph G. E. Kempen, Nico A. J. M. Sommerdijk & James J. De Yoreo doi:10.1038/nmat4193 In situ liquid-phase electron microscopy experiments show that the binding of calcium ions to a biomimetic polymer matrix can direct the nucleation of amorphous calcium carbonate, a main precursor phase in calcium carbonate mineralization. See also: News and Views by Kröger Articles Top Epitaxy of semiconductor–superconductor nanowires   pp400 - 406 P. Krogstrup, N. L. B. Ziino, W. Chang, S. M. Albrecht, M. H. Madsen, E. Johnson, J. Nygård, C. M. Marcus & T. S. Jespersen doi:10.1038/nmat4176 Molecular beam epitaxy now enables the growth of nanowire heterostructures composed of a semiconducting core and a metallic epitaxial shell. This improved synthesis leads to the creation of a hard superconducting gap with no subgap states. Experimental demonstration of hybrid improper ferroelectricity and the presence of abundant charged walls in (Ca,Sr)3Ti2O7 crystals   pp407 - 413 Yoon Seok Oh, Xuan Luo, Fei-Ting Huang, Yazhong Wang & Sang-Wook Cheong doi:10.1038/nmat4168 Room-temperature switchable polarization and the presence of charged domain walls with insulating and conducting configurations are now experimentally demonstrated in bulk (Ca,Sr)3Ti2O7. Dysprosium-doped cadmium oxide as a gateway material for mid-infrared plasmonics   pp414 - 420 Edward Sachet, Christopher T. Shelton, Joshua S. Harris, Benjamin E. Gaddy, Douglas L. Irving, Stefano Curtarolo, Brian F. Donovan, Patrick E. Hopkins, Peter A. Sharma, Ana Lima Sharma, Jon Ihlefeld, Stefan Franzen & Jon-Paul Maria doi:10.1038/nmat4203 The study of the electronic, thermal and optical properties of dysprosium-doped cadmium oxide reveals high electron mobility, rendering the material suitable for plasmonic applications in the mid-infrared region. Highly confined low-loss plasmons in graphene–boron nitride heterostructures   pp421 - 425 Achim Woessner, Mark B. Lundeberg, Yuanda Gao, Alessandro Principi, Pablo Alonso-González, Matteo Carrega, Kenji Watanabe, Takashi Taniguchi, Giovanni Vignale, Marco Polini, James Hone, Rainer Hillenbrand & Frank H. L. Koppens doi:10.1038/nmat4169 Direct imaging and characterization of propagating plasmons in high-quality graphene, encapsulated between two films of hexagonal boron nitride, has now been achieved together with the observation of very low plasmon damping. See also: News and Views by Caldwell & Novoselov A design strategy for intramolecular singlet fission mediated by charge-transfer states in donor–acceptor organic materials   pp426 - 433 Erik Busby, Jianlong Xia, Qin Wu, Jonathan Z. Low, Rui Song, John R. Miller, X-Y. Zhu, Luis M. Campos & Matthew Y. Sfeir doi:10.1038/nmat4175 Design rules for the synthesis of donor–acceptor systems with efficient intramolecular singlet fission are now proposed. These guidelines have been applied to both small molecules and polymeric chains. Impact of mesoscale order on open-circuit voltage in organic solar cells   pp434 - 439 Carl Poelking, Max Tietze, Chris Elschner, Selina Olthof, Dirk Hertel, Björn Baumeier, Frank Würthner, Klaus Meerholz, Karl Leo & Denis Andrienko doi:10.1038/nmat4167 The inclusion of long-range electrostatic effects in the modelling of donor–acceptor systems now leads to a more accurate estimation of the energy landscape and open-circuit voltage of organic solar cells. Atomic origin of ultrafast resistance switching in nanoscale electrometallization cells   pp440 - 446 Nicolas Onofrio, David Guzman & Alejandro Strachan doi:10.1038/nmat4221 Nanoscale resistance-switching cells that operate by means of electrochemical modification of metallic filaments are promising devices for post-CMOS electronics. Simulations of operating conductive cells are now used to describe electrochemical reactions. Template-free nanosized faujasite-type zeolites   pp447 - 451 Hussein Awala, Jean-Pierre Gilson, Richard Retoux, Philippe Boullay, Jean-Michel Goupil, Valentin Valtchev & Svetlana Mintova doi:10.1038/nmat4173 Nanosized faujasite crystals are promising catalysts and adsorbents. The template-free synthesis of such zeolites with a narrow particle size distribution and excellent thermal stability that lead to superior catalytic performances is now reported. Corrigendum Top Corrigendum: Gated three-terminal device architecture to eliminate persistent photoconductivity in oxide semiconductor photosensor arrays   p452 Sanghun Jeon, Seung-Eon Ahn, Ihun Song, Chang Jung Kim, U-In Chung, Eunha Lee, Inkyung Yoo, Arokia Nathan, Sungsik Lee, Khashayar Ghaffarzadeh, John Robertson & Kinam Kim doi:10.1038/nmat4236 Top Advertisement Interested in publishing your next paper to NPG Asia Materials? Here are good reasons to submit your next excellent paper to NPG Asia Materials: -Impact Factor of 9.902* -Ranked 14 of 239 in Multidisciplinary Materials Science* -Open Access:anyone can download and read your paper -Wide exposure and high usage at nature.com  Submit today!     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. 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