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Nature Physics
TABLE OF CONTENTS

August 2018 Volume 14, Issue 8

Editorial
Comment
Thesis
Obituary
Books & Arts
Research Highlights
News & Views
Letters
Articles
Amendments & Corrections
Measure for Measure
 

Editorial

 

Rethinking our physics heroes    p769
doi:10.1038/s41567-018-0263-0

Comment

 

The physics of infinity    pp770 - 772
George F. R. Ellis, Krzysztof A. Meissner & Hermann Nicolai
doi:10.1038/s41567-018-0238-1

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Thesis

 

Witness the fitness    p773
Mark Buchanan
doi:10.1038/s41567-018-0245-2

Obituary

 

Giancarlo Ghirardi    p774
Angelo Bassi
doi:10.1038/s41567-018-0249-y

Books & Arts

 

The jungle book    p775
Maria Maragkou
doi:10.1038/s41567-018-0244-3

Research Highlights

 

That ticking noise    p776
Andreas H. Trabesinger
doi:10.1038/s41567-018-0253-2

Elastic bits    p776
Abigail Klopper
doi:10.1038/s41567-018-0254-1

Happy together    p776
Federico Levi
doi:10.1038/s41567-018-0255-0

Single-photon gatekeepers    p776
Jan Philip Kraack
doi:10.1038/s41567-018-0256-z

Ballistic versus diffusive    p776
Yun Li
doi:10.1038/s41567-018-0257-y

Physics
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News & Views

 

Clicks for doughnuts    pp777 - 778
Scott R. Waitukaitis
doi:10.1038/s41567-018-0160-6

Stars take centre stage    pp778 - 779
Carlos Garzon-Coral & Jonathon Howard
doi:10.1038/s41567-018-0164-2

A hot debut    pp779 - 780
Joseph N. Talmadge
doi:10.1038/s41567-018-0158-0

Letters

 

Higgs mode in a strongly interacting fermionic superfluid    pp781 - 785
A. Behrle, T. Harrison, J. Kombe, K. Gao, M. Link et al.
doi:10.1038/s41567-018-0128-6

An off-resonant radiofrequency modulation scheme applied to a strongly interacting superfluid Fermi gas reveals the presence of a Higgs mode — an oscillation of the amplitude of the superconducting order parameter.

 

Observation of two types of fractional excitation in the Kitaev honeycomb magnet    pp786 - 790
Nejc Janša, Andrej Zorko, Matjaž Gomilšek, Matej Pregelj, Karl W. Krämer et al.
doi:10.1038/s41567-018-0129-5

α-RuCl3, a promising candidate to realize the Kitaev model, has attracted great interest recently. Two types of fractional excitation—gauge fluxes and Majorana fermions—are observed, which contribute to the spin excitation gap in different ways.

 

Direct evidence of ferromagnetism in a quantum anomalous Hall system    pp791 - 795
Wenbo Wang, Yunbo Ou, Chang Liu, Yayu Wang, Ke He et al.
doi:10.1038/s41567-018-0149-1

Long-range ferromagnetic order in co-doped topological insulator thin films and their typical ferromagnetic domain behaviour is directly evidenced by low-temperature magnetic force microscopy.

 

Ferroelectric quantum Hall phase revealed by visualizing Landau level wavefunction interference    pp796 - 800
Mallika T. Randeria, Benjamin E. Feldman, Fengcheng Wu, Hao Ding, András Gyenis et al.
doi:10.1038/s41567-018-0148-2

A phase of strongly interacting electrons that has a spontaneous dipole moment is seen for the first time using an approach that images the electron's wavefunction through interference at an impurity.

 

Momentum-space indirect interlayer excitons in transition-metal dichalcogenide van der Waals heterostructures    pp801 - 805
Jens Kunstmann, Fabian Mooshammer, Philipp Nagler, Andrey Chaves, Frederick Stein et al.
doi:10.1038/s41567-018-0123-y

A new type of exciton is observed in transition-metal dichalcogenide heterobilayers that is indirect in both real space and momentum space. It consists of a paired electron in MoS2 at the K point and hole spread across MoS2 and WSe2 at the Γ point.

 

Giant magnetic response of a two-dimensional antiferromagnet    pp806 - 810
Lin Hao, D. Meyers, Hidemaro Suwa, Junyi Yang, Clayton Frederick et al.
doi:10.1038/s41567-018-0152-6

A superlattice consisting of SrIrO3 and SrTiO3 is shown to display a giant response to sub-tesla external magnetic fields—a direct consequence of its antiferromagnetic nature.

 

Topological kinematics of origami metamaterials    pp811 - 815
Bin Liu, Jesse L. Silverberg, Arthur A. Evans, Christian D. Santangelo, Robert J. Lang et al.
doi:10.1038/s41567-018-0150-8

Origami-inspired metamaterial design gives rise to structures with kinematic properties dictated by the topology of their configuration space. The approach allows for well-defined metamaterial properties even in the presence of unpredictable forces.

 

Articles

 

Controlling Cherenkov angles with resonance transition radiation    pp816 - 821
Xiao Lin, Sajan Easo, Yichen Shen, Hongsheng Chen, Baile Zhang et al.
doi:10.1038/s41567-018-0138-4

The angle of Cherenkov radiation in one-dimensional photonic crystals can be controlled by making use of constructive interference. This feature allows new design of particle detectors with improved performance.

 

A null test of general relativity based on a long-term comparison of atomic transition frequencies    pp822 - 826
Neil Ashby, Thomas E. Parker & Bijunath R. Patla
doi:10.1038/s41567-018-0156-2

Years of data from atomic clocks around the world allow estimation of the variation of their rates with the spatial change of the solar potential. This allows the most precise null test of the local position invariance principle of general relativity.

 

Quantum simulation and spectroscopy of entanglement Hamiltonians    pp827 - 831
M. Dalmonte, B. Vermersch & P. Zoller
doi:10.1038/s41567-018-0151-7

The entanglement spectrum of a many-body quantum system encodes several of its properties. The construction of an artificial Hamiltonian that encodes the spectrum offers the possibility to probe it via quantum simulation or spectroscopy.

 

Aggregation and collapse dynamics of skyrmions in a non-equilibrium state    pp832 - 836
Xiuzhen Yu, Daisuke Morikawa, Tomoyuki Yokouchi, Kiyou Shibata, Naoya Kanazawa et al.
doi:10.1038/s41567-018-0155-3

A Lorentz transmission electron microscopy study of a thin iron germanium film reveals the aggregation dynamics of skyrmions when pushed out of equilibrium.

 

Pressure tuning of light-induced superconductivity in K3C60    pp837 - 841
A. Cantaluppi, M. Buzzi, G. Jotzu, D. Nicoletti, M. Mitrano et al.
doi:10.1038/s41567-018-0134-8

Superconductivity is studied in the molecular solid K3C60 when it is pressurized and illuminated with short laser pulses. Similarities with the non-illuminated case show that superconductivity exists at higher temperatures than previously thought.

 

Equilibrium free energies from non-equilibrium trajectories with relaxation fluctuation spectroscopy    pp842 - 847
David Ross, Elizabeth A. Strychalski, Christopher Jarzynski & Samuel M. Stavis
doi:10.1038/s41567-018-0153-5

Non-equilibrium physics grants access to equilibrium free energies from the work performed on fluctuating systems—but only when the work itself is measurable. Relaxation fluctuation spectroscopy provides an alternative route to these energies.

 

Physical forces determining the persistency and centring precision of microtubule asters    pp848 - 854
Hirokazu Tanimoto, Jeremy Sallé, Louise Dodin & Nicolas Minc
doi:10.1038/s41567-018-0154-4

To perform key processes like division, many cells use star-shaped polymeric aster structures to find their centre. Force measurements now reveal that an active spring mechanism regulates this process, suppressing noise to ensure precise centration.

 

Magnetic configuration effects on the Wendelstein 7-X stellarator    pp855 - 860
A. Dinklage, C. D. Beidler, P. Helander, G. Fuchert, H. Maaßberg et al.
doi:10.1038/s41567-018-0141-9

Results from the first experimental campaign of the Wendelstein 7-X stellarator demonstrate that its magnetic-field design grants good control of parasitic plasma currents, leading to long energy confinement times.

 

A dynamical systems approach to gross domestic product forecasting    pp861 - 865
A. Tacchella, D. Mazzilli & L. Pietronero
doi:10.1038/s41567-018-0204-y

Inspired to methods developed for the study of complex systems, a framework for predicting gross domestic product growth outperforms the accuracy of the five-year forecast of the International Monetary Fund.

 

Amendments & Corrections

 

Publisher Correction: Pressure tuning of light-induced superconductivity in K3C60    p867
A. Cantaluppi, M. Buzzi, G. Jotzu, D. Nicoletti, M. Mitrano et al.
doi:10.1038/s41567-018-0167-z

Publisher Correction: Magnetic configuration effects on the Wendelstein 7-X stellarator    p867
A. Dinklage, C. D. Beidler, P. Helander, G. Fuchert, H. Maaßberg et al.
doi:10.1038/s41567-018-0215-8

Publisher Correction: Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo2V2O8    p867
Quentin Faure, Shintaro Takayoshi, Sylvain Petit, Virginie Simonet, Stéphane Raymond et al.
doi:10.1038/s41567-018-0248-z

Measure for Measure

 

A short story on length    p868
Richard Davis
doi:10.1038/s41567-018-0243-4

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