Nature Physics March Issue

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Advertisement New 12-channel Temperature Monitor The Lake Shore Model 224 temperature monitor offers maximum monitoring capabilities for both higher temperature and cryogenic applications. With 12 independent sensor channels, the device is ideal for researchers who require high sensitivity and measurement flexibility in cryogenic applications. The Model 224 supports Lake Shore Cernox™ thin-film RTDs and other sensors. TABLE OF CONTENTS March 2014 Volume 10, Issue 3 Editorial Correspondence Thesis Research Highlights News and Views Letters Articles Futures Subscribe   Facebook   RSS   Recommend to library   Twitter   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!      Editorial Top Venture and gain   p173 doi:10.1038/nphys2925 An ambitious programme to achieve power generation from nuclear fusion is making some progress, at last. Correspondence Top Testing the reality of the quantum state   p174 Seyyed M. H. Halataei doi:10.1038/nphys2874 See also: Correspondence by Pusey et al. Reply to "Testing the reality of the quantum state"   pp174 - 175 Matthew F. Pusey, Jonathan Barrett and Terry Rudolph doi:10.1038/nphys2875 See also: Correspondence by Halataei Thesis Top The great example   p176 Mark Buchanan doi:10.1038/nphys2910 Research Highlights Top Picturing paints | Living in the past | Tiny lights | Cold flow | Sound selection News and Views Top Quantum computation: Model versus machine   pp179 - 180 Dan Browne doi:10.1038/nphys2914 Comparisons between classically simulated models and the actual performance of a 100-qubit D-Wave processor stimulate, but do not settle, the debate about how quantum annealing really works. See also: Article by Boixo et al. Antiferromagnetism: Giving directions   pp180 - 181 Chong Der Hu doi:10.1038/nphys2899 The Dzyaloshinskii-Moriya interaction — the mechanism behind weak ferromagnetism — has been difficult to probe experimentally. Now, significant progress is reported that has important implications for a wide range of magnetic phenomena. See also: Letter by Dmitrienko et al. Graphene nanoribbons: Electrons go ballistic   pp182 - 183 Juan José Palacios doi:10.1038/nphys2909 A recent experiment shows that graphene nanoribbons can be grown to be perfect conductors where electrons travel long distances without coming across a single obstacle. Nonlinear dynamics: Multifractal mating   p183 Abigail Klopper doi:10.1038/nphys2915 Iron-Based superconductors: Enigmatic nematic   pp184 - 185 J. C. Davis and P. J. Hirschfeld doi:10.1038/nphys2897 Iron pnictide superconductors often feature nematic, symmetry-breaking electronic states. These phenomena are now found to persist into the tetragonal phase of NaFeAs — a new piece of information that may help settle the fundamental origin of nematic electronic states. See also: Article by Rosenthal et al. Soft matter: A triangular affair   pp185 - 186 Michael Engel and Sharon C. Glotzer doi:10.1038/nphys2903 Disks interacting via particular potentials self-organize into triangles that stabilize mosaics with 10-, 12-, 18- and 24-fold symmetry, as revealed by computer simulations. Discoveries of further novel quasicrystals may now be within reach. Quantum information: Strength of weak measurements   pp187 - 188 Victor M. Acosta doi:10.1038/nphys2908 The back-action of a weak measurement on the electron spin of a nitrogen-vacancy centre in diamond can be used to steer the associated nuclear spin towards a desired state. See also: Letter by Blok et al. Quantum optics: Entanglement, heal thyself   p188 Iulia Georgescu doi:10.1038/nphys2912 Physics JOBS of the week Lecturer in Physics The Open University, Faculty of Science Head and Professor in the Department of Physics The University of Hong Kong Lecturer in Physics (New and Sustainable Photovoltaics) University of Liverpool PhD position in Nuclear and Particle Physics Service de Physique Nucléaire, IRFU, CEA Saclay Tenure Track (Biomaterials) Tampere University of Technology More Science jobs from Physics EVENT 2nd Frontiers in Computational Physics: Energy Sciences 8th September 2014 ETH Zurich, Switzerland More science events from Letters Top Manipulating a qubit through the backaction of sequential partial measurements and real-time feedback   pp189 - 193 M. S. Blok, C. Bonato, M. L. Markham, D. J. Twitchen, V. V. Dobrovitski et al. doi:10.1038/nphys2881 Quantum measurements affect the state of the system, so they can be used both as probe and control knob. This idea is demonstrated in an experiment with nuclear spin qubits in diamond that are manipulated by measurements alone. See also: News and Views by Acosta Transport near a quantum critical point in BaFe2(As1–xPx)2   pp194 - 197 James G. Analytis, H-H. Kuo, Ross D. McDonald, Mark Wartenbe, P. M. C. Rourke et al. doi:10.1038/nphys2869 Quantum critical behaviour has been observed in many metallic systems that do not behave conventionally as Fermi liquids. High-magnetic-field experiments now reveal clear evidence for quantum criticality in an iron-based high-temperature superconductor. A one-dimensional liquid of fermions with tunable spin   pp198 - 201 Guido Pagano, Marco Mancini, Giacomo Cappellini, Pietro Lombardi, Florian Schäfer et al. doi:10.1038/nphys2878 The physics of one-dimensional many-body systems is rich but still insufficiently understood. An ultracold atom experiment investigates the behaviour of one-dimensional strongly correlated fermions with a tunable number of spin components. Measuring the Dzyaloshinskii-Moriya interaction in a weak ferromagnet   pp202 - 206 V. E. Dmitrienko, E. N. Ovchinnikova, S. P. Collins, G. Nisbet, G. Beutier et al. doi:10.1038/nphys2859 Oxygen-mediated superexchange (or Dzyaloshinskii-Moriya) interactions result in weak ferromagnetism in oxides. A method based on the interference of synchrotron X-ray radiation is now shown to enable the determination of the sign of the Dzyaloshinskii-Moriya interaction in the prototypical weak ferromagnet iron borate. See also: News and Views by Hu Double ionization probed on the attosecond timescale   pp207 - 211 Erik P. Månsson, Diego Guénot, Cord L. Arnold, David Kroon, Susan Kasper et al. doi:10.1038/nphys2880 To better understand the mechanisms of double ionization following the absorption of one photon, a combination of experimental techniques has been developed to probe the electron emission times in xenon on the attosecond timescale. Bacterial transport suppressed by fluid shear   pp212 - 217 Roberto Rusconi, Jeffrey S. Guasto and Roman Stocker doi:10.1038/nphys2883 Bacteria often reside in fluids. Now, it is shown that hydrodynamic shear, which creates forces and torques on bacterial suspensions, stimulates the attachment of bacteria to surfaces and seriously hinders chemotaxis. Articles Top Evidence for quantum annealing with more than one hundred qubits   pp218 - 224 Sergio Boixo, Troels F. Rønnow, Sergei V. Isakov, Zhihui Wang, David Wecker et al. doi:10.1038/nphys2900 Quantum annealing is expected to solve certain optimization problems more efficiently, but there are still open questions regarding the functioning of devices such as D-Wave One. A numerical and experimental investigation of its performance shows evidence for quantum annealing with 108 qubits. See also: News and Views by Browne Visualization of electron nematicity and unidirectional antiferroic fluctuations at high temperatures in NaFeAs   pp225 - 232 E. P. Rosenthal, E. F. Andrade, C. J. Arguello, R. M. Fernandes, L. Y. Xing et al. doi:10.1038/nphys2870 Superconductivity in iron pnictides seems to be related to the formation of electronic nematic phases that break the rotational symmetry of the crystal lattice. But the nematic phase in NaFeAs is now shown to persist at high temperatures owing to the presence of antiferroic fluctuations. See also: News and Views by Davis & Hirschfeld Observation of three-dimensional massless Kane fermions in a zinc-blende crystal   pp233 - 238 M. Orlita, D. M. Basko, M. S. Zholudev, F. Teppe, W. Knap et al. doi:10.1038/nphys2857 Graphene and topological-insulator surfaces are well known for their two-dimensional conic electronic dispersion relation. Now three-dimensional hyperconic dispersion is shown for electrons in a HgCdTe crystal—once again bridging solid-state physics and quantum electrodynamics. Futures Top A final problem   p240 A. C. Doyle doi:10.1038/nphys2917 Beware a sure thing. Top Advertisement Nature Middle East is your free news portal covering the latest research and scientific breakthroughs in the Arabic-speaking Middle East. 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