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Nature Physics offers a unique mix of news and reviews alongside top-quality research papers. Published monthly, in print and online, the journal reflects the entire spectrum of physics, pure and applied.
Ενημερώθηκε: πριν από 1 ώρα 10 λεπτά

Magnetic-tunnelling-induced Weyl node annihilation in TaP

Δευ, 10/07/2017 - 00:00

Nature Physics 13, 979 (2017). doi:10.1038/nphys4183

Authors: Cheng-Long Zhang, Su-Yang Xu, C. M. Wang, Ziquan Lin, Z. Z. Du, Cheng Guo, Chi-Cheng Lee, Hong Lu, Yiyang Feng, Shin-Ming Huang, Guoqing Chang, Chuang-Han Hsu, Haiwen Liu, Hsin Lin, Liang Li, Chi Zhang, Jinglei Zhang, Xin-Cheng Xie, Titus Neupert, M. Zahid Hasan, Hai-Zhou Lu, Junfeng Wang & Shuang Jia

Spin conversion on the nanoscale

Δευ, 10/07/2017 - 00:00

Nature Physics 13, 829 (2017). doi:10.1038/nphys4192

Authors: YoshiChika Otani, Masashi Shiraishi, Akira Oiwa, Eiji Saitoh & Shuichi Murakami

Tools of the trade — and how to use them

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 619 (2017). doi:10.1038/nphys4215

The role of physicists in finance is changing, as quantitative trading opens an exciting alternative to traditional financial modelling, and data science lures would-be 'quants' away. But the void is being steadily filled by a new type of analyst.

A matter of responding to stress

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 620 (2017). doi:10.1038/nphys4203

Author: Mark Buchanan

The eternal question

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 621 (2017). doi:10.1038/nphys4199

Author: Abigail Klopper

Exhibition: Destination unknown

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 622 (2017). doi:10.1038/nphys4197

Author: Adam Cox

Biomimetics: A sticky job for suckers

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 623 (2017). doi:10.1038/nphys4206

Author: Abigail Klopper

Applied physics: Martian dust blower

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 623 (2017). doi:10.1038/nphys4207

Author: Bart Verberck

Statistical physics: Dialectic magnetism

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 623 (2017). doi:10.1038/nphys4209

Author: Federico Levi

Anyons: Not just another statistic

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 623 (2017). doi:10.1038/nphys4210

Author: Luke Fleet

Meteoritics: Silica puzzle

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 623 (2017). doi:10.1038/nphys4211

Author: Iulia Georgescu

Superconductivity: When Andreev meets Hall

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 625 (2017). doi:10.1038/nphys4195

Authors: Gleb Finkelstein & François Amet

A device with superconducting contacts connected to graphene in the quantum Hall regime hints at a novel Andreev scattering mechanism.

Magnetic skyrmions: On a wedge

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 629 (2017). doi:10.1038/nphys4200

Author: Bart Verberck

Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 638 (2017). doi:10.1038/nphys4182

Authors: Tao Hong, Masashige Matsumoto, Yiming Qiu, Wangchun Chen, Thomas R. Gentile, Shannon Watson, Firas F. Awwadi, Mark M. Turnbull, Sachith E. Dissanayake, Harish Agrawal, Rasmus Toft-Petersen, Bastian Klemke, Kris Coester, Kai P. Schmidt & David A. Tennant

Spontaneous symmetry-breaking quantum phase transitions play an essential role in condensed-matter physics. The collective excitations in the broken-symmetry phase near the quantum critical point can be characterized by fluctuations of phase and amplitude of the order parameter. The phase oscillations correspond to the massless Nambu–Goldstone modes whereas the massive amplitude mode, analogous to the Higgs boson in particle physics, is prone to decay into a pair of low-energy Nambu–Goldstone modes in low dimensions. Especially, observation of a Higgs amplitude mode in two dimensions is an outstanding experimental challenge. Here, using inelastic neutron scattering and applying the bond-operator theory, we directly and unambiguously identify the Higgs amplitude mode in a two-dimensional S  =  1/2 quantum antiferromagnet C9H18N2CuBr4 near a quantum critical point in two dimensions. Owing to an anisotropic energy gap, it kinematically prevents such decay and the Higgs amplitude mode acquires an infinite lifetime.

Magnetic disunity

Τρί, 04/07/2017 - 00:00

Nature Physics 13, 716 (2017). doi:10.1038/nphys4196

Author: Andreas Trabesinger

The path to consistent cgs magnetic units has been long and winding, as is the process of universally adopting SI units. Andreas Trabesinger peeks into the history of the field.

Testing sub-gravitational forces on atoms from a miniature in-vacuum source mass

Δευ, 03/07/2017 - 00:00

Nature Physics 13, 938 (2017). doi:10.1038/nphys4189

Authors: Matt Jaffe, Philipp Haslinger, Victoria Xu, Paul Hamilton, Amol Upadhye, Benjamin Elder, Justin Khoury & Holger Müller

Traditional gravity measurements use bulk masses to both source and probe gravitational fields. Matter-wave interferometers enable the use of probe masses as small as neutrons, atoms and molecular clusters, but still require fields generated by masses ranging from hundreds of kilograms to the entire Earth. Shrinking the sources would enable versatile configurations, improve positioning accuracy, enable tests for beyond-standard-model (‘fifth’) forces, and allow observation of non-classical effects of gravity. Here we detect the gravitational force between freely falling caesium atoms and an in-vacuum, miniature (centimetre-sized, 0.19 kg) source mass using atom interferometry. Sensitivity down to gravitational strength forces accesses the natural scale for a wide class of cosmologically motivated scalar field models of modified gravity and dark energy. We improve the limits on two such models, chameleons and symmetrons, by over two orders of magnitude. We expect further tests of dark energy theories, and measurements of Newton’s gravitational constant and the gravitational Aharonov–Bohm effect.

Long-distance spin transport in a disordered magnetic insulator

Δευ, 03/07/2017 - 00:00

Nature Physics 13, 987 (2017). doi:10.1038/nphys4175

Authors: Devin Wesenberg, Tao Liu, Davor Balzar, Mingzhong Wu & Barry L. Zink

Contact enhancement of locomotion in spreading cell colonies

Δευ, 03/07/2017 - 00:00

Nature Physics 13, 999 (2017). doi:10.1038/nphys4180

Authors: Joseph d’Alessandro, Alexandre P. Solon, Yoshinori Hayakawa, Christophe Anjard, François Detcheverry, Jean-Paul Rieu & Charlotte Rivière

The physics of data

Δευ, 03/07/2017 - 00:00

Nature Physics 13, 718 (2017). doi:10.1038/nphys4202

Author: Jeff Byers

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.


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