BackBrowsing Artículos by Subject "PHYSICS AND ASTRONOMY"
Now showing items 21-40 of 47
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Entanglement negativity in the harmonic chain out of equilibrium
(IOP Publishing, 2014-12-08)We study the entanglement in a chain of harmonic oscillators driven out of equilibrium by preparing the two sides of the system at different temperatures, and subsequently joining them together. The steady state is constructed ... -
Fitting BICEP2 with defects, primordial gravitational waves and dust
Lizarraga Olano, Joanes
; Urrestilla Urizabal, Jon ; ; ; ; (IOP Publishing, 2015)
In this work we discuss the possibility of cosmic defects being responsible for the B-mode signal measured by the BICEP2 collaboration. We also allow for the presence of other cosmological sources of B-modes such as ... -
Germanene: a novel two-dimensional germanium allotrope akin to graphene and silicene
(IOP Publishing, 2014-09-09)We have grown an atom-thin, ordered, two-dimensional multi-phase film in situ through germanium molecular beam epitaxy using a gold (111) surface as a substrate. Its growth is similar to the formation of silicene layers ... -
Giant diamagnetism of gold nanorods
(IOP Publishing, 2014-07-30)The presence of giant diamagnetism in Au nanorods, NRs, is shown to be a possible consequence of field induced currents in the surface electrons. The distance, Delta , between quantum surface energy levels has been calculated ... -
Hartle's model within the general theory of perturbatiye matchings: the change in mass
; Vera Jiménez, Raül (IOP Publishing, 2015)
Hartle's model provides the most widely used analytic framework to describe isolated compact bodies rotating slowly in equilibrium up to second order in perturbations in the context of General Relativity. Apart from some ... -
Helmholtz Fermi surface harmonics: an efficient approach for treating anisotropic problems involving Fermi surface integrals
Eiguren Goyenechea, Asier; García de Gurtubay Galligo, Idoia (IOP Publishing, 2014-06-09)
We present a new efficient numerical approach for representing anisotropic physical quantities and/or matrix elements defined on the Fermi surface (FS) of metallic materials. The method introduces a set of numerically ... -
Interface electronics for an RF resonance-based displacement sensor
Asua Uriarte, Estibaliz; Echevarría Ecenarro, Víctor ; ; Feuchtwanger Morales, Jorge ; Portilla Rubín, Joaquín ; Lucas, J. (IOP Publishing LTD, 2013)
We propose, design, and test an electronic interface for a new standalone, affordable and compact displacement transducer based on resonant cavities. The operation of the interface establishes a self-resonance in the ... -
Long-lived oscillatory incoherent electron dynamics in molecules: trans-polyacetylene oligomers
(IOP Publishing, 2013-04)We identify an intriguing feature of the electron-vibrational dynamics of molecular systems via a computational examination of trans-polyacetylene oligomers. Here, via the vibronic interactions, the decay of an electron ... -
Magnetization reversal and exchange bias effects in hard/soft ferromagnetic bilayers with orthogonal anisotropies
Navas Otero, David; Torrejón, J.; Béron, F.; Redondo Esteban, Carolina; Batallan, F.; Toperverg, B. P.; Devishvili, A.; Sierra Izquierdo, Borja; Castaño Almendral, Fernando; Pirota, K. R; Ross, C. A (IOP Publishing LTD, 2012-11-02)
The magnetization reversal processes are discussed for exchange-coupled ferromagnetic hard/soft bilayers made from Co0.66Cr0.22Pt0.12 (10 and 20 nm)/Ni (from 0 to 40 nm) films with out-of-plane and in-plane magnetic easy ... -
Metallic thin films on stepped surfaces: lateral scattering of quantum well states
; ; ; ; ; ; ; ; ; ; Ortega Conejero, José Enrique (IOP Publishing, 2014-12-10)
Quantum well states of Ag films grown on stepped Au(111) surfaces are shown to undergo lateral scattering, in analogy with surface states of vicinal Ag(111). Applying angle resolved photoemission spectroscopy we observe ... -
Microwave absorption properties of permalloy nanodots in the vortex and quasi-uniform magnetization states
(IOP Publishing, 2014-06-19)When the in-plane bias magnetic field acting on a flat circular magnetic dot is smaller than the saturation field, there are two stable competing magnetization configurations of the dot: the vortex and the quasi-uniform ... -
Occupational exposure to nano-TiO2 in the life cycle steps of new depollutant mortars used in construction
(IOP Publishing, 2015)The present work is focused on the measurement of workers exposure to nano-TiO2 in the life cycle steps of depollutant mortars. It has been done in the framework of the SCAFFOLD project, which aims at the management of ... -
One-dimensional potential for image-potential states on graphene
(IOP Publishing, 2014-02-05)In the framework of dielectric theory, the static non-local self-energy of an electron near an ultra-thin polarizable layer has been calculated and applied to study binding energies of image-potential states near free-standing ... -
Optimally robust shortcuts to population inversion in two-level quantum systems
(IOP Publishing LTD, 2012-09-21)We examine the stability versus different types of perturbations of recently proposed shortcuts to adiabaticity to speed up the population inversion of a two-level quantum system. We find the optimally robust processes by ... -
Optimization of solution-processed oligothiophene:fullerene based organic solar cells by using solvent additives
(Beilstein Institut, 2013-10)The optimization of solution-processed organic bulk-heterojunction solar cells with the acceptor-substituted quinquethiophene DCV5T-Bu-4 as donor in conjunction with PC61BM as acceptor is described. Power conversion ... -
Permutationally invariant state reconstruction
(IOP Publishing, 2012-10)Feasible tomography schemes for large particle numbers must possess, besides an appropriate data acquisition protocol, an efficient way to reconstruct the density operator from the observed finite data set. Since state ... -
Quantum ricochets: surface capture, release and energy loss of fast ions hitting a polar surface at grazing incidence
(IOP Publishing, 2014-06-09)A diffraction mechanism is proposed for the capture, multiple bouncing and final escape of a fast ion (keV) impinging on the surface of a polarizable material at grazing incidence. Capture and escape are effected by elastic ... -
Quantum simulations of relativistic quantum physics in circuit QED
Simón Pedernales, Julen Jon; Di Candia, Roberto; Ballester, D.; Solano Villanueva, Enrique Leónidas (IOP Publishing, 2013-06)
We present a scheme for simulating relativistic quantum physics in circuit quantum electrodynamics. By using three classical microwave drives, we show that a superconducting qubit strongly coupled to a resonator field mode ... -
Real-Time Dynamics in U(1) Lattice Gauge Theories with Tensor Networks
Pichler, T.; Dalmonte, M.; Rico Ortega, Enrique; Zoller, P.; Montangero, S. (American Physical Society, 2016-03-03)
Tensor network algorithms provide a suitable route for tackling real-time-dependent problems in lattice gauge theories, enabling the investigation of out-of-equilibrium dynamics. We analyze a U(1) lattice gauge theory in ... -
Relativistic force between fast electrons and planar targets
(IOP Publishing, 2014-07-30)The full retarded electromagnetic force experienced by swift electrons moving parallel to planar boundaries is revisited, for both metallic and dielectric targets, with special emphasis on the consequences in electron ...