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| |  | TABLE OF CONTENTS
| December 2011 Volume 7, Issue 12 |  | | |  |  Editorials
Thesis
Research Highlights
News and Views
Corrections
Letters
Articles
| | | | | Advertisement | | Job opportunity
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| | | | Editorials |  Top | |  | | End of the line? p919
doi:10.1038/nphys2176
The Higgs boson is running out of places to hide.
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| | | | Hard times p919
doi:10.1038/nphys2177
Investment in science must be part of Europe's plan to rebuild its economies.
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| | Thesis | Top | | | | Simple, but not so simple p921
Mark Buchanan
doi:10.1038/nphys2164
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| | Research Highlights | Top | | | | Let it flow | Family matters | Diamond cavities | Putting it together | Dots work together
| News and Views | Top | | | | | | | Corrections | Top | | | | Correction p930
doi:10.1038/nphys2151
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| | | | Correction p930
doi:10.1038/nphys2152
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| | Letters | Top | | | | Experimental control of the transition from Markovian to non-Markovian dynamics of open quantum systems pp931 - 934
Bi-Heng Liu, Li Li, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo, Elsi-Mari Laine, Heinz-Peter Breuer and Jyrki Piilo
doi:10.1038/nphys2085
An open quantum system loses its 'quantumness' when information about the state leaks into its surroundings. Researchers now control this so-called decoherence in a single photon. By rotating an optical filter, the information flow between the photon and its environment can be tuned. This concept could be harnessed for future quantum technologies.
First paragraph | Full Text | PDF
See also: News and Views by Barreiro |
| | | | Strong back-action of a linear circuit on a single electronic quantum channel pp935 - 938
F. D. Parmentier, A. Anthore, S. Jezouin, H. le Sueur, U. Gennser, A. Cavanna, D. Mailly and F. Pierre
doi:10.1038/nphys2092
At the nanoscale, the conductance of a coherent conductor is reduced by the back-action of the circuit in which it is inserted. The effect has been primarily studied for cases where it is small, but these authors explore the regime of strong back-action—with conductance reductions of up to 90%—and propose a generalized expression for the conductance of quantum channels embedded in linear circuits.
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| | | | Spatial fluctuations of helical Dirac fermions on the surface of topological insulators pp939 - 943
Haim Beidenkopf, Pedram Roushan, Jungpil Seo, Lindsay Gorman, Ilya Drozdov, Yew San Hor, R. J. Cava and Ali Yazdani
doi:10.1038/nphys2108
Helical Dirac fermion states in topological insulators could enable dissipation-free spintronics and robust quantum information processors. A study of the influence of disorder on these states shows that although they are resilient against backscattering by magnetic impurities, fluctuations caused by charge impurities could cause problems for such applications.
First paragraph | Full Text | PDF
| | | | Observation of an electrically tunable band gap in trilayer graphene pp944 - 947
Chun Hung Lui, Zhiqiang Li, Kin Fai Mak, Emmanuele Cappelluti and Tony F. Heinz
doi:10.1038/nphys2102
Monolayer graphene has no electronic band gap. Bilayer graphene does, and can be controlled by an electric field. And for trilayer graphene, infrared transmission measurements indicate both situations are possible depending on the stacking of the layers.
First paragraph | Full Text | PDF
See also: Letter by Zhang et al. | Letter by Bao et al. | News and Views by Yacoby |
| | | | Stacking-dependent band gap and quantum transport in trilayer graphene pp948 - 952
W. Bao, L. Jing, J. Velasco, Jr, Y. Lee, G. Liu, D. Tran, B. Standley, M. Aykol, S. B. Cronin, D. Smirnov, M. Koshino, E. McCann, M. Bockrath and C. N. Lau
doi:10.1038/nphys2103
The electronic properties of graphene depends on how many layers are involved. Monolayer graphene is a zero-gapped semi-metal. Bilayer graphene is a small-gapped semiconductor. Magnetotransport measurements indicate trilayer graphene can be both, depending on its stacking.
First paragraph | Full Text | PDF
See also: Letter by Lui et al. | Letter by Zhang et al. | News and Views by Yacoby |
| | | | The experimental observation of quantum Hall effect of l=3 chiral quasiparticles in trilayer graphene pp953 - 957
Liyuan Zhang, Yan Zhang, Jorge Camacho, Maxim Khodas and Igor Zaliznyak
doi:10.1038/nphys2104
Soon after the isolation of graphene, it was discovered that the charge carriers in monolayer and bilayer sheets exhibit exotic Berry phases of π and 2π respectively. Now, magnetotransport measurements suggest the sequence continues in trilayer graphene, with charge carriers that exhibit a Berry phase of 3π.
First paragraph | Full Text | PDF
See also: Letter by Lui et al. | Letter by Bao et al. | News and Views by Yacoby |
| | | | Tunable metal-insulator transition in double-layer graphene heterostructures pp958 - 961
L. A. Ponomarenko, A. K. Geim, A. A. Zhukov, R. Jalil, S. V. Morozov, K. S. Novoselov, I. V. Grigorieva, E. H. Hill, V. V. Cheianov, V. I. Fal'ko, K. Watanabe, T. Taniguchi and R. V. Gorbachev
doi:10.1038/nphys2114
Disorder-induced Anderson localization usually causes conducting materials to become insulating at low temperature. Graphene is a notable exception. But by increasing the carrier density in one graphene layer, a metal-insulator transition can be induced in an isolated second layer stacked above it.
First paragraph | Full Text | PDF
| | | | A gravitational wave observatory operating beyond the quantum shot-noise limit pp962 - 965
The LIGO Scientific Collaboration
doi:10.1038/nphys2083
'Squeezed light' enables quantum noise in one aspect of light to be reduced by increasing the noise, or more accurately the quantum uncertainty, of a complementary aspect. This has now been used to push the detectors at the heart of the GEO600 gravitational wave observatory to unprecedented levels of sensitivity.
First paragraph | Full Text | PDF
| | | | Optimization hardness as transient chaos in an analog approach to constraint satisfaction pp966 - 970
Mária Ercsey-Ravasz and Zoltán Toroczkai
doi:10.1038/nphys2105
Constraint-satisfaction problems are among the computationally hardest tasks: solutions are efficiently checkable, but no efficient algorithms are known to compute those solutions. Fresh insight might come from physics. A study mapping optimization hardness onto the phenomena of turbulence and chaos suggests that constraint-satisfaction problems can be tackled using analog devices.
First paragraph | Full Text | PDF
| | Articles | Top | | | | Topology by dissipation in atomic quantum wires pp971 - 977
Sebastian Diehl, Enrique Rico, Mikhail A. Baranov and Peter Zoller
doi:10.1038/nphys2106
So-called topological properties can make quantum systems robust to a wide class of microscopic perturbations. Theoretical work now shows that topological features and phenomena occur not only in closed systems, but also in open quantum systems with appropriately engineered dissipation.
Abstract | Full Text | PDF
| | | | Bilayer manganites reveal polarons in the midst of a metallic breakdown pp978 - 982
F. Massee, S. de Jong, Y. Huang, W. K. Siu, I. Santoso, A. Mans, A. T. Boothroyd, D. Prabhakaran, R. Follath, A. Varykhalov, L. Patthey, M. Shi, J. B. Goedkoop and M. S. Golden
doi:10.1038/nphys2089
Understanding the origin of colossal magnetoresistance in the manganites has proved to be one of the more difficult challenges in condensed-matter physics. An unexpected discovery of polarons in the metallic ground state of bilayer manganites could be an important clue.
Abstract | Full Text | PDF
| | | | Criticality and isostaticity in fibre networks pp983 - 988
Chase P. Broedersz, Xiaoming Mao, Tom C. Lubensky and Frederick C. MacKintosh
doi:10.1038/nphys2127
In fibre networks, mechanical stability relies on the fibres' bending resistance—in contrast to rubbers, where entropic stretching is the key. The extent to which the mechanics of fibre networks is controlled by bending is, however, an open question. The study of a general lattice-based model of fibrous networks now reveals two rigidity critical points, one of which controls a rich crossover from stretching-dominated to bending-dominated behaviour.
Abstract | Full Text | PDF
See also: News and Views by van der Giessen |
| | | Top | |  | | Advertisement | | Light: Science & Applications (LSA) - Launching in 2012
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