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Nature Physics August Issue

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Nature Physics

TABLE OF CONTENTS

August 2017 Volume 13, Issue 8

Editorial
Commentary
Thesis
Books and Arts
Research Highlights
News and Views
Letters
Articles
Measure for Measure
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Editorial

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The thing about data   p717
doi:10.1038/nphys4238
The rise of big data represents an opportunity for physicists. To take full advantage, however, they need a subtle but important shift in mindset.

Commentary

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The physics of data   pp718 - 719
Jeff Byers
doi:10.1038/nphys4202
Physicists are accustomed to dealing with large datasets, yet they are fortunate in that the quality of their experimental data is very good. The onset of big data has led to an explosion of datasets with a far more complex structure — a development that requires new tools and a different mindset.

Thesis

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Simple yet successful   p720
Mark Buchanan
doi:10.1038/nphys4228

Books and Arts

Top

Music: Last night a DJ went to space   p721
Federico Levi
doi:10.1038/nphys4226

Research Highlights

Top

Quantum thermodynamics: In the demon's mind | Quantum communication: Satellite to ground control | Plasma physics: Turbulent tabletops | Ultracold gases: A test of scaling | Majorana modes: The new black

News and Views

Top

Gravitational-wave detection: Entanglement at work   pp723 - 724
Raffaele Flaminio
doi:10.1038/nphys4152
The Einstein–Podolsky–Rosen type of quantum entanglement can be used to improve the sensitivity of laser interferometer gravitational-wave detectors beyond the quantum limit.

See also: Article by Ma et al.

Quantum simulation: Probing information scrambling   pp724 - 726
Monika Schleier-Smith
doi:10.1038/nphys4165
Quantum information encoded in one of many interacting particles quickly becomes scrambled. A set of tools for tracking this process is on its way.

See also: Article by Gärttner et al.

Van der waals heterostructures: Exciting double bilayers   pp726 - 728
Koji Muraki
doi:10.1038/nphys4163
An excitonic Bose–Einstein condensate has so far been realized only in particular semiconductor heterostructure setups. Now, experiments show that such condensates can form in double graphene bilayers separated by hexagonal boron nitride.

See also: Letter by Liu et al. | Letter by Li et al.

Cell mechanics: The benefits of getting high   pp728 - 729
Klaus Kroy
doi:10.1038/nphys4128
Standard rheology tells us how a cell responds to deformation. But ramping up the frequency reveals more about its internal dynamics and morphology, mapping a route to improved drug treatments — and possible insight into the malignancy of cancers.

See also: Letter by Rigato et al.

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Letters

Top

Testing universality of Efimov physics across broad and narrow Feshbach resonances   pp731 - 735
Jacob Johansen, B. J. DeSalvo, Krutik Patel and Cheng Chin
doi:10.1038/nphys4130
The emergence of Efimov states in ultracold atomic systems is expected to have a universal behaviour, but a new experimental study defies this expectation, reporting a clear deviation around a narrow Feshbach resonance.

Topological triplon modes and bound states in a Shastry–Sutherland magnet   pp736 - 741
P. A. McClarty, F. Krüger, T. Guidi, S. F. Parker, K. Refson et al.
doi:10.1038/nphys4117
A detailed experimental investigation on the spin excitations in SrCu2(BO3)2 under an external magnetic confirms the existence of topological triplon modes in this experimental realization of the Shastry–Sutherland model.

Multidimensional entropy landscape of quantum criticality   pp742 - 745
K. Grube, S. Zaum, O. Stockert, Q. Si and H. v. Löhneysen
doi:10.1038/nphys4113
Thermal-expansion measurements of CeCu6–xAux reveal the thermodynamic landscape of this material's entropy, offering insights into the behaviour of quantum critical fluctuations as the system approaches its quantum critical point.

Quantum Hall drag of exciton condensate in graphene   pp746 - 750
Xiaomeng Liu, Kenji Watanabe, Takashi Taniguchi, Bertrand I. Halperin and Philip Kim
doi:10.1038/nphys4116
An electronic double layer, subjected to a high magnetic field, can form an exciton condensate: a Bose–Einstein condensate of Coulomb-bound electron–hole pairs. Now, exciton condensation is reported for a graphene/boron-nitride/graphene structure.

See also: News and Views by Muraki

Excitonic superfluid phase in double bilayer graphene   pp751 - 755
J. I. A. Li, T. Taniguchi, K. Watanabe, J. Hone and C. R. Dean
doi:10.1038/nphys4140
Strongly interacting bosons have been predicted to display a transition into a superfluid ground state, similar to Bose–Einstein condensation. This effect is now observed in a double bilayer graphene structure, with excitons as the bosonic particles.

See also: News and Views by Muraki

Tunnelling spectroscopy of Andreev states in graphene   pp756 - 760
Landry Bretheau, Joel I-Jan Wang, Riccardo Pisoni, Kenji Watanabe, Takashi Taniguchi et al.
doi:10.1038/nphys4110
Van der Waals heterostructures provide a tunable platform for probing the Andreev bound states responsible for proximity-induced superconductivity, helping to establish a connection between Andreev physics at finite energy and the Josephson effect.

Hotspot-mediated non-dissipative and ultrafast plasmon passage   pp761 - 765
Eva-Maria Roller, Lucas V. Besteiro, Claudia Pupp, Larousse Khosravi Khorashad, Alexander O. Govorov et al.
doi:10.1038/nphys4120
Strong plasmonic hotspots can facilitate ultrafast energy transfer between metallic nanoparticles with almost no energy loss.

Attosecond chronoscopy of electron scattering in dielectric nanoparticles   pp766 - 770
L. Seiffert, Q. Liu, S. Zherebtsov, A. Trabattoni, P. Rupp et al.
doi:10.1038/nphys4129
Attosecond streaking is used to study the dynamics of electron scattering in dielectric nanoparticles in real time. Revealing the mechanisms involved is the first step towards understanding electron scattering in more complex dielectrics.

High-frequency microrheology reveals cytoskeleton dynamics in living cells   pp771 - 775
Annafrancesca Rigato, Atsushi Miyagi, Simon Scheuring and Felix Rico
doi:10.1038/nphys4104
Microrheology of cells suggests that the dynamics of single filaments in the cytoskeleton dominate at high frequencies. This response can be used to detect differences between cell types and states — including benign and malignant cancer cells.

See also: News and Views by Kroy

Articles

Top

Proposal for gravitational-wave detection beyond the standard quantum limit through EPR entanglement   pp776 - 780
Yiqiu Ma, Haixing Miao, Belinda Heyun Pang, Matthew Evans, Chunnong Zhao et al.
doi:10.1038/nphys4118
Quantum metrology can enhance gravitational-wave detection through the use of squeezed states. A new proposal now suggests that with EPR entanglement one can do even better, reaching sensitivities beyond the standard quantum limit.

See also: News and Views by Flaminio

Measuring out-of-time-order correlations and multiple quantum spectra in a trapped-ion quantum magnet   pp781 - 786
Martin Gärttner, Justin G. Bohnet, Arghavan Safavi-Naini, Michael L. Wall, John J. Bollinger et al.
doi:10.1038/nphys4119
Characterizing the correlations of quantum many-body systems is known to be hard, but there are ways around: for example, a new method for measuring out-of-time correlations demonstrated in a Penning trap quantum simulator with over 100 ions.

See also: News and Views by Schleier-Smith

A dissipative quantum reservoir for microwave light using a mechanical oscillator   pp787 - 793
L. D. Tóth, N. R. Bernier, A. Nunnenkamp, A. K. Feofanov and T. J. Kippenberg
doi:10.1038/nphys4121
A microwave cavity optomechanics experiment investigates the interplay between the electromagnetic and mechanical modes and how their roles can be reversed in engineered dissipation.

Möbius Kondo insulators   pp794 - 798
Po-Yao Chang, Onur Erten and Piers Coleman
doi:10.1038/nphys4092
A family of topologically protected Kondo insulators, termed Möbius Kondo insulators, is predicted. A re-analysis of archival resistivity measurements of Ce3Bi4Pt3 and CeNiSn suggests they may be good candidate members of this class.

Quasiparticle interference and strong electron-mode coupling in the quasi-one-dimensional bands of Sr2RuO4   pp799 - 805
Zhenyu Wang, Daniel Walkup, Philip Derry, Thomas Scaffidi, Melinda Rak et al.
doi:10.1038/nphys4107
The normal state of the ruthenate Sr2RuO4 is not that of a conventional metal but one with enhanced correlation effects, which may help to elucidate the origin of the unconventional superconductivity observed in this material.

Mottness at finite doping and charge instabilities in cuprates   pp806 - 811
S. Peli, S. Dal Conte, R. Comin, N. Nembrini, A. Ronchi et al.
doi:10.1038/nphys4112
The electron dynamics of single-layer Bi2Sr2–xLaxCuO6+δ is studied as a function of doping, revealing the evolution of charge-transfer excitations from incoherent and localized (as in a Mott insulator) to coherent and delocalized (as in a conventional metal).

Mixed electrochemical–ferroelectric states in nanoscale ferroelectrics   pp812 - 818
Sang Mo Yang, Anna N. Morozovska, Rajeev Kumar, Eugene A. Eliseev, Ye Cao et al.
doi:10.1038/nphys4103
Nanoscale ferroelectricity is hard to characterize. Studies of BaTiO3 thin films now reveal a close coupling between the ferroelectric and the surface electrochemical states — a notion important for future applications of ferroelectric nanomaterials.

Measure for Measure

Top

The invention of dimension   p820
Steven T. Bramwell
doi:10.1038/nphys4229
Assigning dimensions to physical quantities is not just for practicality. Steven T. Bramwell reflects on the deeper physical connotations of it all.

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