Nature Physics February Issue

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Advertisement "We are at the beginning of the largest revolution in scientific publishing since Gutenberg invented printing."  Read our special interview with Alex Hansen, professor of theoretical physics at the Norwegian University of Science and Technology and Field Chief Editor of Frontiers in Physics TABLE OF CONTENTS February 2014 Volume 10, Issue 2 Editorial Commentary Thesis Books and Arts Research Highlights News and Views Research Letters Articles Corrigendum Futures Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement Nature Materials Focus Issue: Bioimaging Imaging intracellular compartments, cells and tissues enables more accurate diagnosis and treatment of disease. In this focus issue we highlight the latest developments and clinical translation of materials-based technologies for imaging cells or the disease microenvironment with the promise of improved therapeutic outcomes.  Access the Focus Issue    Editorial Top Rosetta awakes   p81 doi:10.1038/nphys2896 ESA's Rosetta spacecraft has begun the next phase of its ambitious mission to land a probe on the nucleus of a comet, and ride with the comet towards the Sun. Commentary Top Timekeepers of the future   pp82 - 83 Helen Margolis doi:10.1038/nphys2834 The latest generation of optical atomic clocks has reached such a degree of accuracy that questions about the need to redefine the second are raised. But even without such a redefinition, these breakthroughs will enable unprecedented precision tests of fundamental physics. Thesis Top A helping hand   p84 Mark Buchanan doi:10.1038/nphys2885 Books and Arts Top Who we are   p85 Andreas Trabesinger reviews The Oxford Handbook of the History of Physics edited by Jed Buchwald and Robert Fox doi:10.1038/nphys2888 Research Highlights Top Knotty business | In the mix | A mathematical metamaterial | Trap and conquer | A flare to remember News and Views Top Microfluidics: For a few drops more   pp87 - 88 Howard A. Stone and Shashi Thutupalli doi:10.1038/nphys2879 Experiments in microfluidics reveal long-range orientational correlations in the velocities of flowing droplets that can be rationalized in terms of an analytically solvable model. See also: Letter by Shani et al. Magnetic monopoles: Quenching the fire in spin ice   pp88 - 89 Hans-Benjamin Braun doi:10.1038/nphys2882 The density of monopoles in spin ice can be enhanced by rapid cooling. After the creation of significant numbers of monopoles, magnetization measurements show that, much like charges in an electric field, monopoles can be driven by a magnetic field. See also: Letter by Paulsen et al. Ultracold atoms: Pairing with a twist   pp90 - 91 Waseem Bakr doi:10.1038/nphys2851 In the presence of light-induced spin-orbit coupling, ultracold atoms form pairs with a spin-triplet component. Creating these pairs is an important step towards realizing atomic superfluids with topological excitations. See also: Letter by Fu et al. Quantum information: The occasional super clock-cloner   pp91 - 92 John Calsamiglia doi:10.1038/nphys2853 The no-cloning theorem is challenged by super-replication, a process that takes a number of copies of a state and produces a quadratically larger number of exponentially close-to-perfect copies — the catch being the low odds of success. Galactic centre: The final countdown   p92 May Chiao doi:10.1038/nphys2890 Optical materials: Silicon carbide goes quantum   pp93 - 94 Igor Aharonovich and Milos Toth doi:10.1038/nphys2858 Defects in the crystal lattice of silicon carbide prove to be a useful room-temperature source of non-classical light. See also: Article by Kraus et al. Quantum phase transitions: Magnetic islands   pp94 - 95 F. Malte Grosche doi:10.1038/nphys2884 Chemical doping is a standard method of tuning electronic and structural properties of materials. Now, it has been shown that doping a pure superconductor can induce a percolative transition to magnetism. See also: Letter by Seo et al. Surface science: Bend setters   p95 Bart Verberck doi:10.1038/nphys2889 Physics JOBS of the week Master student internship in material chemistry (chemistry, physics or physical chemistry) (m / f) Centre de Recherche Public - Gabriel Lippmann Leaders of Independent Junior Research Group in Theoretical Physics Asia Pacific Center for Theoretical Physics Professorship - Faculty of Physics University of Vienna (Universitaet Wien) DP-PMI - Second edition of the Doctoral Programme in the Physics and Mathematics of Information IST - Instituto Superior Tecnico Postdoctoral Position in Solar Physics Max Planck Institute for Solar System research More Science jobs from Physics EVENT 2nd Annual International Conference on Physics 21st July 2014 Athens, Greece More science events from Research Top What drives nematic order in iron-based superconductors?   pp97 - 104 R. M. Fernandes, A. V. Chubukov and J. Schmalian doi:10.1038/nphys2877 Nematic order in the iron-based superconductors breaks the symmetry between the x and y directions in the Fe plane. Beyond this, however, there is little consensus on how nematic order arises and whether it has an effect on superconductivity. This Review discusses the current theoretical and experimental state of the field. Letters Top Local detection of quantum correlations with a single trapped ion   pp105 - 109 M. Gessner, M. Ramm, T. Pruttivarasin, A. Buchleitner, H-P. Breuer et al. doi:10.1038/nphys2829 In open quantum systems the correlations between the system and its environment play an important role. A trapped-ion experiment demonstrates that these correlations can be detected without accessing or knowing anything about the environment or its interactions. Production of Feshbach molecules induced by spin-orbit coupling in Fermi gases   pp110 - 115 Zhengkun Fu, Lianghui Huang, Zengming Meng, Pengjun Wang, Long Zhang et al. doi:10.1038/nphys2824 The creation of Feshbach molecules by exploiting engineered spin-orbit coupling in a spin-polarized Fermi gas advances the experimental study of topological superfluidity in ultracold gases. See also: News and Views by Bakr Universal dynamics of a degenerate unitary Bose gas   pp116 - 119 P. Makotyn, C. E. Klauss, D. L. Goldberger, E. A. Cornell and D. S. Jin doi:10.1038/nphys2850 Ultracold atoms could help in understanding the physics of strongly interacting many-body systems, but the creation of degenerate Bose gases at unitarity has been hampered by the losses. An experiment overcomes these problems and investigates the time evolution of a unitary Bose gas. Disorder in quantum critical superconductors   pp120 - 125 S. Seo, Xin Lu, J-X. Zhu, R. R. Urbano, N. Curro et al. doi:10.1038/nphys2820 Chemical substitution often mimics the effects of applied pressure on a compound, and 'doping' is a standard way to reach a quantum critical point from a given phase. However, CeCoIn5 is a natural quantum critical superconductor, and Cd-doping tunes the system away from criticality. Applied pressure reverses the effect of doping, but although superconductivity is restored, quantum criticality is not. See also: News and Views by Grosche Switching of magnetic domains reveals spatially inhomogeneous superconductivity   pp126 - 129 Simon Gerber, Marek Bartkowiak, Jorge L. Gavilano, Eric Ressouche, Nikola Egetenmeyer et al. doi:10.1038/nphys2833 CeCoIn5 is a d-wave heavy-fermion superconductor. By tuning the coupling between magnetic and superconducting order, a phase with inhomogeneous p-wave superconductivity can be detected, which coexists with d-wave superconductivity and spin-density-wave order. Spin-layer locking effects in optical orientation of exciton spin in bilayer WSe2   pp130 - 134 Aaron M. Jones, Hongyi Yu, Jason S. Ross, Philip Klement, Nirmal J. Ghimire et al. doi:10.1038/nphys2848 Monolayer and few-layer materials present interesting spin and pseudospin states. A study of the coupling between spin, valley and layer degrees of freedom in bilayer WSe2 reveals coherent superpositions of distinct valley configurations and suggests the possibility of electrical control of the spin states. Far-from-equilibrium monopole dynamics in spin ice   pp135 - 139 C. Paulsen, M. J. Jackson, E. Lhotel, B. Canals, D. Prabhakaran et al. doi:10.1038/nphys2847 Magnetic monopoles can exist in frustrated magnetic systems known as spin ices. The study of these exotic objects is challenging, but a technique that uses the quench parameters to control the number of monopoles could help. See also: News and Views by Braun Long-range orientational order in two-dimensional microfluidic dipoles   pp140 - 144 Itamar Shani, Tsevi Beatus, Roy H. Bar-Ziv and Tsvi Tlusty doi:10.1038/nphys2843 Ensembles of micrometre-sized water droplets in a laminar oil flow are ideal systems for studying non-equilibrium dynamics. In the case of two-dimensional confinement, the interactions between the droplets' flow-induced dipole moments lead to long-range velocity correlations and four-fold angular symmetry—behaviour that can be understood from first-principle hydrodynamics calculations. See also: News and Views by Stone & Thutupalli Articles Top Emergent SU(4) Kondo physics in a spin-charge-entangled double quantum dot   pp145 - 150 A. J. Keller, S. Amasha, I. Weymann, C. P. Moca, I. G. Rau et al. doi:10.1038/nphys2844 Double quantum dots are proving themselves to be an excellent test bed for many-body physics. These artificial atoms now demonstrate a phenomenon in which the capacitive coupling between them causes the spin and charge degrees of freedom of the electrons in the system to become entangled—the so-called SU(4) Kondo effect. Real-space tailoring of the electron-phonon coupling in ultraclean nanotube mechanical resonators   pp151 - 156 A. Benyamini, A. Hamo, S. Viola Kusminskiy, F. von Oppen and S. Ilani doi:10.1038/nphys2842 A mechanism for coupling the electrons and vibrational motion of a suspended carbon nanotube is now demonstrated. Tailoring the coupling between specific electronic and phononic modes by controlling the position of quantum dots along the resonating tube enables spatial imaging of the mode shape. Room-temperature quantum microwave emitters based on spin defects in silicon carbide   pp157 - 162 H. Kraus, V. A. Soltamov, D. Riedel, S. Väth, F. Fuchs et al. doi:10.1038/nphys2826 Defects in silicon carbide can produce continuous-wave microwaves at room temperature. Spectroscopic analysis indicates a photoinduced inversion of the population in the spin ground states, which makes the defects a potential route to stimulated amplification of microwave radiation. See also: News and Views by Aharonovich & Toth Liposome adhesion generates traction stress   pp163 - 169 Michael P. Murrell, Raphaël Voituriez, Jean-François Joanny, Pierre Nassoy, Cécile Sykes et al. doi:10.1038/nphys2855 Biomembranes can transmit forces over cellular length scales. Now, however, their active role in generating stress is demonstrated. The adhesion and spreading of a liposome that has no active cytoskeletal machinery are shown to contract the substrate, exerting traction stresses that are comparable with those of living cells. Corrigendum Top Corrigendum: Universal spin dynamics in two-dimensional Fermi gases   p170 Marco Koschorreck, Daniel Pertot, Enrico Vogt and Michael Köhl doi:10.1038/nphys2873 Futures Top How to lose the one you love   p172 Gary Cuba doi:10.1038/nphys2886 Out of sight, out of mind. Top Advertisement Does your manuscript have what it takes to get published? Macmillan Science Communication Scientific Editing can help you maximize the impact of your research or grant application with in-depth developmental editing and incisive advice from Nature-standard editors.  Submit your manuscript 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. Find the latest scientific conferences, courses, meetings and symposia on natureevents.com. 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