Física de la Matèria Condensada: Enviaments recents
Ara mostrant els elements 41-60 de 1287
Radiative isotropic cosmologies with extra dimensions
We solve Einsteins equations in an n-dimensional vacuum with the simplest ansatz leading to a Friedmann-Robertson-Walker (FRW) four-dimensional space time. We show that the FRW model must be of radiation. For the open ...
Premartensitic and martensitic phase transition in ferromagnetic Ni2MnGa
We present an experimental study of the premartensitic and martensitic phase transitions in a Ni2MnGa single crystal by using ultrasonic techniques. The effect of applied magnetic field and uniaxial compressive stress has ...
Formation of helical membrane tubes around microtubules by single-headed kinesin KIF1A
Author correction available at: https://doi.org/10.1038/s41467-019-11010-5
Evidence for Quantization of Mechanical Rotation of Magnetic Nanoparticles
We report evidence of the quantization of the rotational motion of solid particles containing thousands of atoms. A system of CoFe 2 O 4 nanoparticles confined inside polymeric cavities has been studied. The particles have ...
An algebraic topological method for multimodal brain networks comparison
Understanding brain connectivity is one of the most important issues in neuroscience. Nonetheless, connectivity data can reflect either functional relationships of brain activities or anatomical connections between brain ...
Photocatalytic magnetic microgyroscopes with activity-tunable precessional dynamics
Magnetic nano/microrotors are passive elements spinning around an axis due to an external rotating field while remaining confined to a plane. They have been used to date in different applications related to fluid mixing, ...
Clogging and jamming of colloidal monolayers driven across disordered landscapes
Understanding microscale transport across heterogeneous landscapes is relevant for many phenomena in condensed matter physics, from pinning of vortices in dirty superconductors, to electrons on liquid helium, skyrmions, ...
Bleb nucleation through membrane pealing
We study the nucleation of blebs, i.e., protrusions arising from a local detachment of the membrane from the cortex of a cell. Based on a simple model of elastic linkers with force-dependent kinetics, we show that bleb ...
Spin dynamics in single-molecule magnets combining surface acoustic waves and high frequency electron paramagnetic resonance
We report an experimental technique that integrates high-frequency surface acoustic waves (SAWs) with high-frequency electron paramagnetic resonance (HFEPR) spectroscopy in order to measure spin dynamics on fast time scales ...
Goya's artwork imaging with Terahertz waves
In this paper we use a Terahertz (THz) time-domain system to image and analyze the structure of an artwork attributed to the Spanish artist Goya painted in 1771. The THz images show features that cannot be seen with optical ...
Dynamic properties of Lennard Jones fluids and liquid metals
The dependence of the dynamic properties of liquid metals and Lennard-Jones fluids on the characteristics of the interaction potentials is analyzed. Molecular-dynamics simulations of liquids in analogous conditions but ...
Interaction effects and energy barrier distribution on the magnetic relaxation of nanocrystalline hexagonal ferrites
The static and dynamic magnetic properties of nanocrystalline BaFe10.4Co0.8Ti0.8O19 M-type doped barium ferrite were studied in detail to clarify the effect of interactions on the magnetic relaxation of an assembly of small ...
Casimir forces exerted by epsilon-near-zero hyperbolic materials
The Casimir force exerted on a gold dipolar nanoparticle by a fnite-thickness slab of the natural hyperbolic material namely, the ortorhombic crystalline modifcation of boron nitride, is investigated. The main contribution ...
Testing the mutual information expansion of entropy with multivariate Gaussian distributions
The mutual information expansion (MIE) represents an approximation of the configurational entropy in terms of low-dimensional integrals. It is frequently employed to compute entropies from simulation data of large systems, ...
Field synchronized bidirectional current in confined driven colloids
We investigate the collective colloidal current that emerges when strongly confined magnetic microspheres are subjected to a biased, but spatially uniform, precessing magnetic field. We observe a net bidirectional current ...
Full phase diagram of active Brownian disks: From melting to motility-induced phase separation
We establish the complete phase diagram of self-propelled hard disks in two spatial dimensions from the analysis of the equation of state and the statistics of local order parameters. The equilibrium melting scenario is ...
Minimum-uncertaity states and pseudoclassical dynamics. II
The set of initial conditions for which the pseudoclassical evolution algorithm (and minimality conservation) is verified for Hamiltonians of degrees N (N>2) is explicitly determined through a class of restrictions for the ...
Effect of elastic colored noise in the hopping dynamics of single molecules in stretching experiments
The influence of colored noise induced by elastic fluctuations in single-molecule stretching experiments is theoretically and numerically studied. Unlike in the thermal white noise case currently considered in the literature, ...
Rheological Characterization of Three-Dimensional Neuronal Cultures Embedded in PEGylated Fibrin Hydrogels
Three-dimensional (3D) neuronal cultures are valuable models for studying brain complexity in vitro, and the choice of the bulk material in which the neurons grow is a crucial factor in establishing successful cultures. ...
Finite-temperature T matrix in a real-time formalism
A generalized off-shell unitarity relation for the two-body scattering T matrix in a many-body medium at finite temperature is derived, through a consistent real-time perturbation expansion by means of Feynman diagrams. ...
