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npj 2D Materials and Applications is an online-only, open access journal that aims to become a top-tier interdisciplinary platform for scientists to share research on 2D materials and their applications. Part of the Nature Partner Journals series, npj 2D Materials and Applications is published in partnership with FCT NOVA, Lisbon, with the support of the European Materials Research Society (E-MRS).
npj Materials Degradation is a new open access journal that is now open for submissions. The journal publishes the finest content describing basic and applied research discoveries in the area of corrosion (degradation) and protection of materials.
Beyond particle physics p1139 doi:10.1038/nmat4791 Topological semimetals give access to new quantum phenomena — for example, massless fermions have not been observed as elementary particles, yet they can be realized in the form of quasiparticles in these materials — and could allow the development of robust quantum devices.
Weyl semimetals, Fermi arcs and chiral anomalies pp1140 - 1144 Shuang Jia, Su-Yang Xu and M. Zahid Hasan doi:10.1038/nmat4787 Physicists have discovered a new topological phase of matter, the Weyl semimetal, whose surface features a non-closed Fermi surface whereas the low-energy quasiparticles in the bulk emerge as Weyl fermions. A brief review of these developments and perspectives on the next steps forward are presented.
Topological semimetals pp1145 - 1148 A. A. Burkov doi:10.1038/nmat4788 Topological semimetals and metals have emerged as a new frontier in the field of quantum materials. Novel macroscopic quantum phenomena they exhibit are not only of fundamental interest, but may hold some potential for technological applications.
Weyl semimetals: Magnetically induced pp1149 - 1150 Claudia Felser and Binghai Yan doi:10.1038/nmat4741 The half-Heusler GdPtBi is found to show transport and calorimetric signatures of the existence of Weyl fermions under the application of a magnetic field. The half-Heusler alloys form a big family of tunable compounds that may substantially enlarge the number of Weyl semimetals known.
Amorphous solids: Rayleigh scattering revisited pp1150 - 1151 Jeppe C. Dyre doi:10.1038/nmat4735 Scaling of the phonon damping with the wavevector in glasses is found to be different from the traditionally assumed Rayleigh scattering, and related to surprising, long-range correlations in the local elasticity matrix.
Colloidal crystals: Stresses come to light pp1151 - 1152 Mark Bowick and Paul Chaikin doi:10.1038/nmat4786 Confocal microscopy and computational analysis, now used for measuring microscale stresses in colloidal crystals, could be developed for investigation of amorphous materials, crystal melting, and mechanical properties of tissues.
Materials synthesis: Two-dimensional gallium nitride pp1153 - 1154 Nikhil A. Koratkar doi:10.1038/nmat4740 Graphene is used as a capping sheet to synthesize 2D gallium nitride by means of migration-enhanced encapsulation growth. This technique may allow the stabilization of 2D materials that are not amenable to synthesis by traditional methods.
Spectroscopic evidence for a type II Weyl semimetallic state in MoTe2pp1155 - 1160 Lunan Huang, Timothy M. McCormick, Masayuki Ochi, Zhiying Zhao, Michi-To Suzuki et al. doi:10.1038/nmat4685 MoTe2 is reported to host type II topological Weyl semimetal states. Two sets of Weyl points exist at different energies above the Fermi energy. Fermi arcs that form closed loops and are unique to type II Weyl semimetals are also found.
Two-dimensional gallium nitride realized via graphene encapsulation pp1166 - 1171 Zakaria Y. Al Balushi, Ke Wang, Ram Krishna Ghosh, Rafael A. Vila, Sarah M. Eichfeld et al. doi:10.1038/nmat4742 A method to synthesize 2D layers of gallium nitride on SiC is reported. Epitaxial graphene preliminarily grown on SiC allows intercalation of gallium atoms on the SiC substrate and stabilizes the 2D gallium nitride islands formed by ammonolysis.
Since the proposal for lasing from a condensate of exciton-polaritons, the properties of these quasiparticles have been rigorously studied. Nature Materials presents a Focus which explores the challenges towards the fabrication of practical devices as well as their potential for the demonstration of unique physical phenomena.
Electrochemical stiffness in lithium-ion batteries pp1182 - 1187 Hadi Tavassol, Elizabeth M. C. Jones, Nancy R. Sottos and Andrew A. Gewirth doi:10.1038/nmat4708 Electrochemically induced stresses in battery electrodes leading to performance degradation are still poorly understood. In situ measurements show that stress scales proportionally with lithium intercalation rate and strain with capacity.
Mechanism of hard-nanomaterial clearance by the liver pp1212 - 1221 Kim M. Tsoi, Sonya A. MacParland, Xue-Zhong Ma, Vinzent N. Spetzler, Juan Echeverri et al. doi:10.1038/nmat4718 The blood clearance mechanism, by the liver, of administered hard nanomaterials is reported in relation to blood flow dynamics, organ microarchitecture and cellular phenotype.
Lithium-ion batteries are efficient energy storage devices that have transformed personal electronics. However, questions still remain as to whether they will realise their full market potential. Find out more about the key challenges facing their development here.
npj Computational Materials is a new online only, fully open access journal dedicated to publishing the finest articles on materials by design and integrated computational and experimental materials research.
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