1  Amorphous topological insulators constructed from random point sets
20180116 
 Amorphous topological insulators constructed from random point sets Amorphous topological insulators constructed from random point sets, Published online: 15 January 2018; doi:10.1038/s4156701700245 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 fewlayer stanene
20180116 
 Superconductivity in fewlayer stanene Superconductivity in fewlayer stanene, Published online: 15 January 2018; doi:10.1038/s4156701700316 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
20180113 
 Weyl points are the crossings of linearly dispersing energy bands of threedimensional 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 saddleshaped 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
20180113 
 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 nonHermitian radiative losses in an open system of photonic crystal slabs. Moreover, we discover halfinteger topological charges in the polarization of farfield radiation around the bulk Fermi arc. Both phenomena are shown to be direct consequences of the nonHermitian topological properties of exceptional points, where resonances coincide in their frequencies and linewidths. Our work connects the fields of topological photonics, nonHermitian physics and singular optics, providing a framework to explore more complex nonHermitian topological systems. 

5  Destabilizing turbulence in pipe flow
20180110 
 Destabilizing turbulence in pipe flow Destabilizing turbulence in pipe flow, Published online: 08 January 2018; doi:10.1038/s4156701700183 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
20180110 
 Peace in the pipeline Peace in the pipeline, Published online: 08 January 2018; doi:10.1038/s4156701700370 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  Threecomponent fermions with surface Fermi arcs in tungsten carbide
20180110 
 Threecomponent fermions with surface Fermi arcs in tungsten carbide Threecomponent fermions with surface Fermi arcs in tungsten carbide, Published online: 08 January 2018; doi:10.1038/s4156701700218 Triply degenerate electronic structure—threecomponent fermions—protected by crystal symmetries is observed in tungsten carbide. The observed Fermi arcs associated with the surface states provide evidence of the nontrivial topology of the states. 

8  Threes company
20180110 
 Threes company Threes company, Published online: 08 January 2018; doi:10.1038/s4156701700325 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
20180108 
 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  NonHermitian physics and PT symmetry
20180108 
 NonHermitian physics and PT symmetry NonHermitian 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 nonHermitian physics in optics, plasmonics and optomechanics. 

 