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One ID to rule them all p519


Some Springer Nature journals, including Nature Physics, are mandating Open Researcher and Contributor IDs (ORCIDs) for the corresponding authors of accepted papers. We provide some context to this initiative.



Boundary effects on currents around ciliated larvae pp520 - 521

George von Dassow, Richard Emlet & Daniel Grünbaum


See also: Correspondence by Gilpin et al.

Reply to 'Boundary effects on currents around ciliated larvae' pp521 - 522

William Gilpin, Vivek N. Prakash & Manu Prakash


See also: Correspondence by von Dassow et al.



Four decades of open science pp523 - 525

Bernard L. Hecker


INSPIRE, the central information resource of the high-energy physics community, pioneered the open dissemination of scientific literature. It has been evolving to keep up with the new technologies and it is not slowing down.



The origin of cell division p526

Mark Buchanan



Books and Arts

The right answer p527

Iulia Georgescu reviews We Have No Idea: A Guide to the Unknown Universe by Jorge Cham & Daniel Whiteson


Exhibition: The road to bionic man pp527 - 528



News and Views

Axion searches: Exciting times pp530 - 531

Maurizio Giannotti


While axions remain elusive, the CERN Axion Solar Telescope has now reached the interesting region where physics beyond the standard model could be glimpsed.

See also: Article by Anastassopoulos et al.

Particle physics: Alice in strangeland pp531 - 532

Francesco Becattini


An enhanced production of particles with strange quarks has been observed in high-multiplicity proton–proton collisions — an important clue to understand how strange quarks form, and perhaps a hint of the quark–gluon plasma.

See also: Letter by Adam et al.

Topological photonics: Come to light pp532 - 533

Alexander B. Khanikaev


Topological concepts have been demonstrated in microwave photonic systems but laser-written waveguides show the way to topological physics for light at optical frequencies.

See also: Article by Noh et al.

Quantum electrodynamics: Hyperfine puzzle? pp533 - 534

Jean-Philippe Karr


Improved-accuracy measurements of the ground-state hyperfine splitting in highly charged bismuth ions reveal a surprising discrepancy with the predictions of quantum electrodynamics.



Enhanced production of multi-strange hadrons in high-multiplicity proton–proton collisions Open pp535 - 539

ALICE Collaboration


Quark–gluon plasma is an exotic state of matter that can emerge in heavy nuclei high-energy collisions. The ALICE collaboration reports the first observation of strangeness enhancement in proton–proton collisions, a possible signature of this state.

See also: News and Views by Becattini

Weak-value amplification of the nonlinear effect of a single photon pp540 - 544

Matin Hallaji, Amir Feizpour, Greg Dmochowski, Josiah Sinclair & Aephraim M. Steinberg


Using two entangled optical beams and post-selection, a single photon can have the same effect as eight photons in terms of the induced phase shift. This example illustrates the power of the so-called weak-value amplification.

Experimental measurement of the Berry curvature from anomalous transport pp545 - 550

Martin Wimmer, Hannah M. Price, Iacopo Carusotto & Ulf Peschel


The Berry curvature is essential to the study of the topological properties of a system, be it solid-state, atomic or photonic. In 1D photonic lattices there is a new clever way of measuring the Berry curvature.

Experimental quantum Hamiltonian learning pp551 - 555

Jianwei Wang, Stefano Paesani, Raffaele Santagati, Sebastian Knauer, Antonio A. Gentile, Nathan Wiebe, Maurangelo Petruzzella, Jeremy L. OBrien, John G. Rarity, Anthony Laing & Mark G. Thompson


With the help of a quantum simulator and Bayesian inference it is possible to determine the unknown Hamiltonian of a quantum system. An experiment demonstrates this using a photonic quantum simulator and a solid-state system.

Entanglement area law in superfluid 4He pp556 - 558

C. M. Herdman, P.-N. Roy, R. G. Melko & A. Del Maestro


When the entropy of a system scales as a function of its surface area, rather than its volume, it is said to obey an entropy area law. Now, an area law is shown to exist numerically in the entanglement entropy of superfluid helium.

Waveform measurement of charge- and spin-density wavepackets in a chiral Tomonaga–Luttinger liquid pp559 - 562

M. Hashisaka, N. Hiyama, T. Akiho, K. Muraki & T. Fujisawa


The spatial separation of charge and spin densities in one-dimensional electron systems is the hallmark of Tomonaga–Luttinger physics. Waveform measurements now provide direct evidence for spin–charge separation.

Signatures of interaction-induced helical gaps in nanowire quantum point contacts pp563 - 567

S. Heedt, N. Traverso Ziani, F. Crépin, W. Prost, St. Trellenkamp, J. Schubert, D. Grützmacher, B. Trauzettel & Th. Schäpers


Signatures of spin–momentum-locked gap states in nanowire quantum point contacts that have all-electrical origin could provide the conditions for the quasiparticle excitations required for topological quantum computing.

Para-hydrogen raser delivers sub-millihertz resolution in nuclear magnetic resonance pp568 - 572

Martin Suefke, Sören Lehmkuhl, Alexander Liebisch, Bernhard Blümich & Stephan Appelt


A method for narrowing the NMR linewidth of specific molecules to the sub-millihertz range—two orders of magnitude below the natural linewidth—could open up new avenues for molecular characterization.

Collisionless momentum transfer in space and astrophysical explosions pp573 - 577

A. S. Bondarenko, D. B. Schaeffer, E. T. Everson, S. E. Clark, B. R. Lee, C. G. Constantin, S. Vincena, B. Van Compernolle, S. K. P. Tripathi, D. Winske & C. Niemann


Larmor coupling is a collisionless momentum exchange mechanism believed to occur in various astrophysical and space-plasma environments. The phenomenon is now observed in a laboratory experiment.

Bulk rectification effect in a polar semiconductor pp578 - 583

T. Ideue, K. Hamamoto, S. Koshikawa, M. Ezawa, S. Shimizu, Y. Kaneko, Y. Tokura, N. Nagaosa & Y. Iwasa


Electrical rectification is usually achieved by layering p-type and n-type materials, but experiments now demonstrate rectification in a bulk polar semiconductor that has inversion-symmetry breaking and strong Rashba spin–orbit coupling.



New CAST limit on the axion–photon interaction Open pp584 - 590

CAST Collaboration


Axions are hypothetical light particles that could explain the dark matter. They could be produced in the interior of the Sun and the CERN Axion Solar Telescope sets the best limit on how strongly axions can interact with light.

See also: News and Views by Giannotti

Ultrafast terahertz control of extreme tunnel currents through single atoms on a silicon surface pp591 - 598

Vedran Jelic, Krzysztof Iwaszczuk, Peter H. Nguyen, Christopher Rathje, Graham J. Hornig, Haille M. Sharum, James R. Hoffman, Mark R. Freeman & Frank A. Hegmann


Controlling electric currents on the atomic scale requires being able to handle the ultrafast timescales involved. Now, experiments have demonstrated the feasibility of terahertz scanning tunnelling microscopy as a method for doing just that.

Orthogonal magnetization and symmetry breaking in pyrochlore iridate Eu2Ir2O7 pp599 - 603

Tian Liang, Timothy H. Hsieh, Jun J. Ishikawa, Satoru Nakatsuji, Liang Fu & N. P. Ong


A torque magnetometry study of the pyrochlore iridate Eu2Ir2O7 reveals an unusual symmetry-breaking effect that persists above the Néel temperature of this antiferromagnet.

Electron–hole exchange blockade and memory-less recombination in photoexcited films of colloidal quantum dots pp604 - 610

Andrew F. Fidler, Jianbo Gao & Victor I. Klimov


Understanding the recombination dynamics in quantum dots is crucial for their use in optoelectronic devices. A photocurrent spectroscopy study shows how two distinct relaxation mechanisms are at play over different timescales.

Experimental observation of optical Weyl points and Fermi arc-like surface states pp611 - 617

Jiho Noh, Sheng Huang, Daniel Leykam, Y. D. Chong, Kevin P. Chen & Mikael C. Rechtsman


Three-dimensional laser-written waveguide arrays are used to demonstrate type-II Weyl points, along with Fermi arc-like surface states, for light at optical wavelengths.

See also: News and Views by Khanikaev


Measure for Measure

Quantifying the quantum p618

Stephan Schlamminger


Stephan Schlamminger looks at the origins of the Planck constant and its current role in redefining the kilogram.


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