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1 Amorphous topological insulators constructed from random point sets 2018-01-16             

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Amorphous topological insulators constructed from random point sets

Amorphous topological insulators constructed from random point sets, Published online: 15 January 2018; doi:10.1038/s41567-017-0024-5

Whether spatial order is required for structures that support topological modes remains unclear. Amorphous arrangements of interacting gyroscopes suggest that topology arises in materials for which the only design principle is the local connectivity.

2 Superconductivity in few-layer stanene 2018-01-16             

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Superconductivity in few-layer stanene

Superconductivity in few-layer stanene, Published online: 15 January 2018; doi:10.1038/s41567-017-0031-6

Stanene is a single sheet of tin atoms. Here, it is shown that a few stacked layers of stanene can be a superconductor. Changing the thickness of the substrate modifies the form of superconductivity and critical temperature.

3 Ideal Weyl points and helicoid surface states in artificial photonic crystal structures 2018-01-13             

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Weyl points are the crossings of linearly dispersing energy bands of three-dimensional crystals, providing the opportunity to explore a variety of intriguing phenomena such as topologically protected surface states and chiral anomalies. However, the lack of an ideal Weyl system in which the Weyl points all exist at the same energy and are separated from any other bands, poses a serious limitation to the further development of Weyl physics and potential applications. By experimentally characterizing a microwave photonic crystal of saddle-shaped metallic coils, we observe ideal Weyl points that are related to each other through symmetry operations. Topological surface states exhibiting helicoidal structure have also been demonstrated. Our system provides a photonic platform for exploring ideal Weyl systems and developing possible topological devices.

4 Observation of bulk Fermi arc and polarization half charge from paired exceptional points 2018-01-13             

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The ideas of topology have found tremendous success in closed physical systems, but even richer properties exist in the more general open or dissipative framework. We theoretically propose and experimentally demonstrate a bulk Fermi arc that develops from non-Hermitian radiative losses in an open system of photonic crystal slabs. Moreover, we discover half-integer topological charges in the polarization of far-field radiation around the bulk Fermi arc. Both phenomena are shown to be direct consequences of the non-Hermitian topological properties of exceptional points, where resonances coincide in their frequencies and linewidths. Our work connects the fields of topological photonics, non-Hermitian physics and singular optics, providing a framework to explore more complex non-Hermitian topological systems.

5 Destabilizing turbulence in pipe flow 2018-01-10             

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Destabilizing turbulence in pipe flow

Destabilizing turbulence in pipe flow, Published online: 08 January 2018; doi:10.1038/s41567-017-0018-3

Turbulence in pipe flows causes substantial friction (and therefore economic) losses. An experimental and numerical study now shows a solution might be to initially enhance turbulent mixing, which subsequently leads to a collapse of turbulence.

6 Peace in the pipeline 2018-01-10             

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Peace in the pipeline

Peace in the pipeline, Published online: 08 January 2018; doi:10.1038/s41567-017-0037-0

Turbulence in pipe flows causes substantial friction and economic losses. The solution to appease the flow through pipelines might be, counterintuitively, to initially enhance turbulent mixing and get laminar flow in return.

7 Three-component fermions with surface Fermi arcs in tungsten carbide 2018-01-10             

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Three-component fermions with surface Fermi arcs in tungsten carbide

Three-component fermions with surface Fermi arcs in tungsten carbide, Published online: 08 January 2018; doi:10.1038/s41567-017-0021-8

Triply degenerate electronic structure—three-component fermions—protected by crystal symmetries is observed in tungsten carbide. The observed Fermi arcs associated with the surface states provide evidence of the non-trivial topology of the states.

8 Threes company 2018-01-10             

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Threes company

Threes company, Published online: 08 January 2018; doi:10.1038/s41567-017-0032-5

Enabled by recent advances in symmetry and electronic structure, researchers have observed signatures of unconventional threefold degeneracies in tungsten carbide, challenging a longstanding paradigm in nodal semimetals.

9 Economic complexity: From useless to keystone 2018-01-08             

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Economic complexity: From useless to keystone

Economic complexity: From useless to keystone, Published online: 05 January 2018; doi:10.1038/nphys4337

Technological innovation seems to be dominated by chance. But a new mathematical analysis suggests we might be able to anticipate when seemingly useless technologies become keystones of more complex environments.

10 Non-Hermitian physics and PT symmetry 2018-01-08             

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Non-Hermitian physics and PT symmetry

Non-Hermitian physics and PT symmetry, Published online: 05 January 2018; doi:10.1038/nphys4323

This Review Article outlines the exploration of the interplay between parity–time symmetry and non-Hermitian physics in optics, plasmonics and optomechanics.

 
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