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Nature Materials

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https://www.readbyqxmd.com/read/29760510/electron-phonon-interaction-in-efficient-perovskite-blue-emitters
#1
Xiwen Gong, Oleksandr Voznyy, Ankit Jain, Wenjia Liu, Randy Sabatini, Zachary Piontkowski, Grant Walters, Golam Bappi, Sergiy Nokhrin, Oleksandr Bushuyev, Mingjian Yuan, Riccardo Comin, David McCamant, Shana O Kelley, Edward H Sargent
Low-dimensional perovskites have-in view of their high radiative recombination rates-shown great promise in achieving high luminescence brightness and colour saturation. Here we investigate the effect of electron-phonon interactions on the luminescence of single crystals of two-dimensional perovskites, showing that reducing these interactions can lead to bright blue emission in two-dimensional perovskites. Resonance Raman spectra and deformation potential analysis show that strong electron-phonon interactions result in fast non-radiative decay, and that this lowers the photoluminescence quantum yield (PLQY)...
May 14, 2018: Nature Materials
https://www.readbyqxmd.com/read/29760509/the-role-of-metal-oxide-interfaces-for-long-range-metal-particle-activation-during-co-oxidation
#2
Yuri Suchorski, Sergey M Kozlov, Ivan Bespalov, Martin Datler, Diana Vogel, Zuzana Budinska, Konstantin M Neyman, Günther Rupprechter
No abstract text is available yet for this article.
May 14, 2018: Nature Materials
https://www.readbyqxmd.com/read/29736002/materials-challenges-for-the-starshot-lightsail
#3
REVIEW
Harry A Atwater, Artur R Davoyan, Ognjen Ilic, Deep Jariwala, Michelle C Sherrott, Cora M Went, William S Whitney, Joeson Wong
No abstract text is available yet for this article.
May 7, 2018: Nature Materials
https://www.readbyqxmd.com/read/29736001/atomic-origins-of-water-vapour-promoted-alloy-oxidation
#4
Langli Luo, Mao Su, Pengfei Yan, Lianfeng Zou, Daniel K Schreiber, Donald R Baer, Zihua Zhu, Guangwen Zhou, Yanting Wang, Stephen M Bruemmer, Zhijie Xu, Chongmin Wang
The presence of water vapour, intentional or unavoidable, is crucial to many materials applications, such as in steam generators, turbine engines, fuel cells, catalysts and corrosion1-4 . Phenomenologically, water vapour has been noted to accelerate oxidation of metals and alloys5,6 . However, the atomistic mechanisms behind such oxidation remain elusive. Through direct in situ atomic-scale transmission electron microscopy observations and density functional theory calculations, we reveal that water-vapour-enhanced oxidation of a nickel-chromium alloy is associated with proton-dissolution-promoted formation, migration, and clustering of both cation and anion vacancies...
May 7, 2018: Nature Materials
https://www.readbyqxmd.com/read/29713039/an-unusual-continuous-paramagnetic-limited-superconducting-phase-transition-in-2d-nbse-2
#5
Egon Sohn, Xiaoxiang Xi, Wen-Yu He, Shengwei Jiang, Zefang Wang, Kaifei Kang, Ju-Hyun Park, Helmuth Berger, László Forró, Kam Tuen Law, Jie Shan, Kin Fai Mak
Time reversal and spatial inversion are two key symmetries for conventional Bardeen-Cooper-Schrieffer (BCS) superconductivity 1 . Breaking inversion symmetry can lead to mixed-parity Cooper pairing and unconventional superconducting properties1-5 . Two-dimensional (2D) NbSe2 has emerged as a new non-centrosymmetric superconductor with the unique out-of-plane or Ising spin-orbit coupling (SOC)6-9 . Here we report the observation of an unusual continuous paramagnetic-limited superconductor-normal metal transition in 2D NbSe2 ...
April 30, 2018: Nature Materials
https://www.readbyqxmd.com/read/29713038/motorizing-fibres-with-geometric-zero-energy-modes
#6
Arthur Baumann, Antoni Sánchez-Ferrer, Leandro Jacomine, Philippe Martinoty, Vincent Le Houerou, Falko Ziebert, Igor M Kulić
Responsive materials1-3 have been used to generate structures with built-in complex geometries4-6 , linear actuators7-9 and microswimmers10-12 . These results suggest that complex, fully functional machines composed solely from shape-changing materials might be possible 13 . Nonetheless, to accomplish rotary motion in these materials still relies on the classical wheel and axle motifs. Here we explore geometric zero-energy modes to elicit rotary motion in elastic materials in the absence of a rigid wheel travelling around an axle...
April 30, 2018: Nature Materials
https://www.readbyqxmd.com/read/29686277/vapour-liquid-solid-growth-of-monolayer-mos-2-nanoribbons
#7
Shisheng Li, Yung-Chang Lin, Wen Zhao, Jing Wu, Zhuo Wang, Zehua Hu, Youde Shen, Dai-Ming Tang, Junyong Wang, Qi Zhang, Hai Zhu, Leiqiang Chu, Weijie Zhao, Chang Liu, Zhipei Sun, Takaaki Taniguchi, Minoru Osada, Wei Chen, Qing-Hua Xu, Andrew Thye Shen Wee, Kazu Suenaga, Feng Ding, Goki Eda
Chemical vapour deposition of two-dimensional materials typically involves the conversion of vapour precursors to solid products in a vapour-solid-solid mode. Here, we report the vapour-liquid-solid growth of monolayer MoS2 , yielding highly crystalline ribbons with a width of few tens to thousands of nanometres. This vapour-liquid-solid growth is triggered by the reaction between MoO3 and NaCl, which results in the formation of molten Na-Mo-O droplets. These droplets mediate the growth of MoS2 ribbons in the 'crawling mode' when saturated with sulfur...
April 23, 2018: Nature Materials
https://www.readbyqxmd.com/read/29662160/highly-reversible-zinc-metal-anode-for-aqueous-batteries
#8
Fei Wang, Oleg Borodin, Tao Gao, Xiulin Fan, Wei Sun, Fudong Han, Antonio Faraone, Joseph A Dura, Kang Xu, Chunsheng Wang
Metallic zinc (Zn) has been regarded as an ideal anode material for aqueous batteries because of its high theoretical capacity (820 mA h g-1 ), low potential (-0.762 V versus the standard hydrogen electrode), high abundance, low toxicity and intrinsic safety. However, aqueous Zn chemistry persistently suffers from irreversibility issues, as exemplified by its low coulombic efficiency (CE) and dendrite growth during plating/ stripping, and sustained water consumption. In this work, we demonstrate that an aqueous electrolyte based on Zn and lithium salts at high concentrations is a very effective way to address these issues...
April 16, 2018: Nature Materials
https://www.readbyqxmd.com/read/29662159/hole-trap-formation-in-polymer-light-emitting-diodes-under-current-stress
#9
Quan Niu, Roland Rohloff, Gert-Jan A H Wetzelaer, Paul W M Blom, N Irina Crăciun
Polymer light-emitting diodes (PLEDs) are attractive for use in large-area displays and lighting panels, but their limited stability under current stress impedes commercialization. In spite of large efforts over the last two decades a fundamental understanding of the degradation mechanisms has not been accomplished. Here we demonstrate that the voltage drift of a PLED driven at constant current is caused by the formation of hole traps, which leads to additional non-radiative recombination between free electrons and trapped holes...
April 16, 2018: Nature Materials
https://www.readbyqxmd.com/read/29662158/more-power-to-pyroelectrics
#10
Joseph P Feser, Jayakanth Ravichandran
No abstract text is available yet for this article.
April 16, 2018: Nature Materials
https://www.readbyqxmd.com/read/29662157/pyroelectric-energy-conversion-with-large-energy-and-power-density-in-relaxor-ferroelectric-thin-films
#11
Shishir Pandya, Joshua Wilbur, Jieun Kim, Ran Gao, Arvind Dasgupta, Chris Dames, Lane W Martin
The need for efficient energy utilization is driving research into ways to harvest ubiquitous waste heat. Here, we explore pyroelectric energy conversion from low-grade thermal sources that exploits strong field- and temperature-induced polarization susceptibilities in the relaxor ferroelectric 0.68Pb(Mg1/3 Nb2/3 )O3 -0.32PbTiO3 . Electric-field-driven enhancement of the pyroelectric response (as large as -550 μC m-2  K-1 ) and suppression of the dielectric response (by 72%) yield substantial figures of merit for pyroelectric energy conversion...
April 16, 2018: Nature Materials
https://www.readbyqxmd.com/read/29662156/enhanced-spin-pumping-into-superconductors-provides-evidence-for-superconducting-pure-spin-currents
#12
Kun-Rok Jeon, Chiara Ciccarelli, Andrew J Ferguson, Hidekazu Kurebayashi, Lesley F Cohen, Xavier Montiel, Matthias Eschrig, Jason W A Robinson, Mark G Blamire
Unlike conventional spin-singlet Cooper pairs, spin-triplet pairs can carry spin1,2 . Triplet supercurrents were discovered in Josephson junctions with metallic ferromagnet spacers, where spin transport can occur only within the ferromagnet and in conjunction with a charge current. Ferromagnetic resonance injects a pure spin current from a precessing ferromagnet into adjacent non-magnetic materials3,4 . For spin-singlet pairing, the ferromagnetic resonance spin pumping efficiency decreases below the critical temperature (Tc ) of a coupled superconductor5,6 ...
April 16, 2018: Nature Materials
https://www.readbyqxmd.com/read/29632409/large-local-lattice-expansion-in-graphene-adlayers-grown-on-copper
#13
Chaoyu Chen, José Avila, Hakim Arezki, Van Luan Nguyen, Jiahong Shen, Marcin Mucha-Kruczyński, Fei Yao, Mohamed Boutchich, Yue Chen, Young Hee Lee, Maria C Asensio
Variations of the lattice parameter can significantly change the properties of a material, and, in particular, its electronic behaviour. In the case of graphene, however, variations of the lattice constant with respect to graphite have been limited to less than 2.5% due to its well-established high in-plane stiffness. Here, through systematic electronic and lattice structure studies, we report regions where the lattice constant of graphene monolayers grown on copper by chemical vapour deposition increases up to ~7...
April 9, 2018: Nature Materials
https://www.readbyqxmd.com/read/29632408/electrostrain-in-excess-of-1-in-polycrystalline-piezoelectrics
#14
Bastola Narayan, Jaskaran Singh Malhotra, Rishikesh Pandey, Krishna Yaddanapudi, Pavan Nukala, Brahim Dkhil, Anatoliy Senyshyn, Rajeev Ranjan
Piezoelectric actuators transform electrical energy into mechanical energy, and because of their compactness, quick response time and accurate displacement, they are sought after in many applications. Polycrystalline piezoelectric ceramics are technologically more appealing than single crystals due to their simpler and less expensive processing, but have yet to display electrostrain values that exceed 1%. Here we report a material design strategy wherein the efficient switching of ferroelectric-ferroelastic domains by an electric field is exploited to achieve a high electrostrain value of 1...
April 9, 2018: Nature Materials
https://www.readbyqxmd.com/read/29632407/room-temperature-ductile-inorganic-semiconductor
#15
Xun Shi, Hongyi Chen, Feng Hao, Ruiheng Liu, Tuo Wang, Pengfei Qiu, Ulrich Burkhardt, Yuri Grin, Lidong Chen
Ductility is common in metals and metal-based alloys, but is rarely observed in inorganic semiconductors and ceramic insulators. In particular, room-temperature ductile inorganic semiconductors were not known until now. Here, we report an inorganic α-Ag2 S semiconductor that exhibits extraordinary metal-like ductility with high plastic deformation strains at room temperature. Analysis of the chemical bonding reveals systems of planes with relatively weak atomic interactions in the crystal structure. In combination with irregularly distributed silver-silver and sulfur-silver bonds due to the silver diffusion, they suppress the cleavage of the material, and thus result in unprecedented ductility...
April 9, 2018: Nature Materials
https://www.readbyqxmd.com/read/29632406/deformable-inorganic-semiconductor
#16
Dae-Hyeong Kim, Gi Doo Cha
No abstract text is available yet for this article.
April 9, 2018: Nature Materials
https://www.readbyqxmd.com/read/29610487/collapse-of-superconductivity-in-cuprates-via-ultrafast-quenching-of-phase-coherence
#17
F Boschini, E H da Silva Neto, E Razzoli, M Zonno, S Peli, R P Day, M Michiardi, M Schneider, B Zwartsenberg, P Nigge, R D Zhong, J Schneeloch, G D Gu, S Zhdanovich, A K Mills, G Levy, D J Jones, C Giannetti, A Damascelli
The possibility of driving phase transitions in low-density condensates through the loss of phase coherence alone has far-reaching implications for the study of quantum phases of matter. This has inspired the development of tools to control and explore the collective properties of condensate phases via phase fluctuations. Electrically gated oxide interfaces1,2 , ultracold Fermi atoms3,4 and cuprate superconductors5,6 , which are characterized by an intrinsically small phase stiffness, are paradigmatic examples where these tools are having a dramatic impact...
April 2, 2018: Nature Materials
https://www.readbyqxmd.com/read/29581552/ambipolar-landau-levels-and-strong-band-selective-carrier-interactions-in-monolayer-wse-2
#18
Martin V Gustafsson, Matthew Yankowitz, Carlos Forsythe, Daniel Rhodes, Kenji Watanabe, Takashi Taniguchi, James Hone, Xiaoyang Zhu, Cory R Dean
Monolayers (MLs) of transition-metal dichalcogenides (TMDs) exhibit unusual electrical behaviour under magnetic fields due to their intrinsic spin-orbit coupling and lack of inversion symmetry1-15 . Although recent experiments have also identified the critical role of carrier interactions within these materials11,15 , a complete mapping of the ambipolar Landau level (LL) sequence has remained elusive. Here we use single-electron transistors (SETs)16,17 to perform LL spectroscopy in ML WSe2 , and provide a comprehensive picture of the electronic structure of a ML TMD for both electrons and holes...
March 26, 2018: Nature Materials
https://www.readbyqxmd.com/read/29555999/ultrahigh-piezoelectricity-in-ferroelectric-ceramics-by-design
#19
Fei Li, Dabin Lin, Zibin Chen, Zhenxiang Cheng, Jianli Wang, ChunChun Li, Zhuo Xu, Qianwei Huang, Xiaozhou Liao, Long-Qing Chen, Thomas R Shrout, Shujun Zhang
Piezoelectric materials, which respond mechanically to applied electric field and vice versa, are essential for electromechanical transducers. Previous theoretical analyses have shown that high piezoelectricity in perovskite oxides is associated with a flat thermodynamic energy landscape connecting two or more ferroelectric phases. Here, guided by phenomenological theories and phase-field simulations, we propose an alternative design strategy to commonly used morphotropic phase boundaries to further flatten the energy landscape, by judiciously introducing local structural heterogeneity to manipulate interfacial energies (that is, extra interaction energies, such as electrostatic and elastic energies associated with the interfaces)...
March 19, 2018: Nature Materials
https://www.readbyqxmd.com/read/29555998/spin-currents-and-spin-orbit-torques-in-ferromagnetic-trilayers
#20
Seung-Heon C Baek, Vivek P Amin, Young-Wan Oh, Gyungchoon Go, Seung-Jae Lee, Geun-Hee Lee, Kab-Jin Kim, M D Stiles, Byong-Guk Park, Kyung-Jin Lee
Magnetic torques generated through spin-orbit coupling1-8 promise energy-efficient spintronic devices. For applications, it is important that these torques switch films with perpendicular magnetizations without an external magnetic field9-14 . One suggested approach15 to enable such switching uses magnetic trilayers in which the torque on the top magnetic layer can be manipulated by changing the magnetization of the bottom layer. Spin currents generated in the bottom magnetic layer or its interfaces transit the spacer layer and exert a torque on the top magnetization...
March 19, 2018: Nature Materials
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