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Angle-resolved photoemission spectroscopy shows that the superconducting critical temperature in optimally doped iron pnictide Ba(Fe1−xCox)2As2 can be enhanced upon Na/K surface doping.
The spin-switching of optically induced polariton condensates can be externally controlled with an electric field, with switching energies below 0.5 fJ.
Films based on π-stacked carbon nitride polymers are shown to bend rapidly and jump up to 10,000 times their thickness as a result of minimal variations—induced by changes in the ambient humidity or temperature—of absorbed water.
Strain engineering can ‘hide’ the ordinal ferrometallic state in manganite films, pushing the system to a metastable state, which can then be controlled through photoexcitation.
Metal–dielectric Janus colloids subjected to perpendicular a.c. electric fields can self-organize into swarms, chains, clusters and isotropic gases, depending on the frequency of the field.
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.
The half-Heusler GdPtBi is reported to exhibit negative longitudinal magnetoresistance. This is attributed to the chiral anomaly due to the formation of Weyl nodes with an applied magnetic field. The anomaly is also found to suppress the thermopower.
Charge-density-wave formation in YBa2Cu3O6+δ (δ ∼ 1) is enhanced at the interface with the metallic ferromagnet La2/3Ca1/3MnO3. This long-range proximity effect—it persists over several tens of nm—is claimed to have an electronic origin.
Epitaxial strain is known to induce and enhance ferroelectricity in thin films of complex oxides. It is now shown that a polar-to-nonpolar transition might also occur.
2D surface plasmon polaritons are used to probe the domain-wall solitons in bilayer graphene; near-field infrared nanoscopy reveals various domain-wall structures in mechanically exfoliated graphene bilayers.
Single-cell mechanical homeostasis is found to be driven by the mechanosensitive, collective subcellular dynamics of cytoskeletal tension and focal adhesions.
The dynamics of the magnetic correlations after photo-doping Sr2IrO4 are studied through ultrafast time-resolved resonant inelastic X-ray spectroscopy. The timescales are found to depend on the dimensionality of the correlations.
The transition from a polaronic to a metallic state as the carrier density increases in strontium titanate overlaps with the onset and peak of the bulk superconducting behaviour.
The dispersion of metal–organic framework nanocrystals within a polyimide yields membranes for selective chemical separations with strong resistance to plasticization.
The design of large-pore proton conductors with well-defined high-order structures is challenging. Proton conduction in a crystalline covalent organic framework 2–4 orders of magnitude higher than microporous polymers is now demonstrated.
Experiments with engineered hydrogels show that the geometry of the interface at the perimeter of tumour tissue can guide cancer cells towards a stem-cell-like state.