Oxford, UK, 3-6 April 2017
- Published on Wednesday, 09 November 2016 10:42
Tweaking equations to drive greater superconductivity-inducing crystal vibrations proves theoretical possibility of creating higher temperature superconductors
Superconductivity is like an Eldorado for electrons, as they flow without resistance through a conductor. However, it only occurs below a very low critical temperature. Physicists now believe they can enhance superconductivity - the idea is to externally drive its underlying physical phenomena by changing how ions vibrating in the crystal lattice of the conductor material, called phonons, interact with electron flowing in the material. Andreas Komnik from the University of Heidelberg and Michael Thorwart from the University of Hamburg, Germany, adapted the simplest theory of superconductivity to reflect the consequences of externally driving the occurrence of phonons. Their main result, published in EPJ B, is a simple formula explaining how it is theoretically possible to raise the critical temperature using phonon driving.
- Published on Tuesday, 08 November 2016 15:07
EDP Sciences are pleased to announce that EPJ Nuclear Sciences and Technologies (EPJ-N) has been accepted for indexing in the Thomson Reuters Emerging Sources Citation Index (ESCI). This means that articles published in the journal will be searchable, discoverable and citable via Web of Science.
- Published on Tuesday, 08 November 2016 10:00
We are delighted to announce that "EPJ Applied Metamaterials" is now indexed in the Directory of Open Access Journals (DOAJ), a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.
- Published on Monday, 07 November 2016 12:31
We are delighted to announce that Springer Nature has rolled out its free content sharing initiative, named SharedIt, to all of the Springer Nature-owned journals portfolio, along with 1,000 co-published partner journals. This includes EPJA, EPJB, EPJD, EPJE, EPJ ST, EPJH, EPJ Plus, EPJ DS, EPJ TI, EPJ QT.
We want researchers to share content easily and legally. Our SharedIt content-sharing initiative means that links to view-only, full-text research articles can be posted anywhere - including on social media platforms, author websites and in institutional repositories - so researchers can share research with colleagues and general audiences.
- Published on Friday, 04 November 2016 15:11
The Ψk conference is the foremost event in the field of electronic structure and computation in condensed matter, and the Volker Heine award is one of its highlights. Being intended for young researchers, the award aims at helping their career by exposing their work in a prestigious international conference, and adding a modest point to their Curriculum Vitae.
- Published on Friday, 04 November 2016 14:36
First-principles calculations combining density functional theory and many-body perturbation theory can provide microscopic insight into the dynamics of electrons and phonons in materials. In this EPJ B Colloquium, Marco Bernardi, winner of the Psi’K young investigator award, reviews this theoretical and computational framework, focusing on perturbative treatments of scattering, dynamics, and transport of electrons and phonons. The article examines applications of these first-principles calculations in electronics, lighting, spectroscopy, and renewable energy.
- Published on Wednesday, 02 November 2016 18:46
Study explains how long-range effects in two-liquid cocktails have a bearing on the diffusion of their molecules, resulting in the coexistence of different characteristics within the same fluid
Disturbing a mix of two liquids can yield some surprising effects. For example, if one portion of the mixture is brought to a different composition, it starts a process called diffusion, which continues until the liquid mix reverts to the resting point, which physicists refer to as equilibrium. Understanding the underlying physical phenomenon matters because diffusion is ubiquitous in physical and biological processes, such as the transport of nutrients within our cells. Now, an Italian team of physicists has found that two-liquid cocktails display long-range correlations, both at equilibrium and when disturbed. This means that large regions with slightly different physical properties coexist within the same fluid. Outside the equilibrium condition, the authors explain, this is due to the coupling between the difference in concentration between different portions of the liquid and spontaneous fluctuations, which are also observed when the mix is at equilibrium. These findings have been published in EPJ E as part of the Topical Issue "Non-isothermal transport in complex fluids" by Fabio Giavazzi from the University of Milan, Italy, and colleagues. They imply that the long-range effects, observed when the mixture is not at equilibrium, need to be taken into account as an additional contribution to the effects observed when the mixture is at equilibrium, so as to understand the diffusion mechanisms.
- Published on Wednesday, 02 November 2016 17:20
Analysing the traces of human behaviour from geolocalisation data gives clues for more accurate urban planning
Getting urban planning right is no mean feat. It requires understanding how and when people travel between different places. This knowledge, in turn, helps in dimensioning roads and motorways and in scaling the capacity of utilities, such as power grids or mobile phone towers. Now, physicists at the Institute for Scientific Interchange Foundation in Turin, Italy, have exploited the geolocalisation data from millions of users of the photo sharing site Flickr to show how it is possible to predict crowd movements. Mariano Beiró and colleagues have combined this data with existing theoretical models explaining the movement of people. In a study published in EPJ Data Science, they show that their approach can help improve predictions concerning the nature of travel of large crowds of people between two places.
- Published on Tuesday, 25 October 2016 14:21
Supersonic solitary waves in nano-electronics crystals show potentials for electric charge or matter transport and energy storage with extremely low heat dissipation
Freak waves, as well as other less striking localised excitations, occur in nature at every scale. The current theory and models of such waves can be applied to physics and, among others, to oceanography, nonlinear optics and lasers, acoustics, plasmas, cosmological relativity and neuro-dynamics. However, they could also play a significant role at the quantum scale in nano-electronics. In a recent study, Manuel G. Velarde from the Pluridisciplinary Institute of the University Complutense of Madrid, Spain, and colleagues, performed computer simulations to compare two types of localised excitations in nano-electronics. Their findings, published in a recent study in EPJ B, confirm that such localised excitations are natural candidates for energy storage and transport. These, in turn, could lead to applications such as transistors with extremely low heat dissipation not using silicon.
- Published on Thursday, 20 October 2016 07:38
Exact simulation lifts the 80-year-old mystery of the degree to which atoms can be dressed with photons
In 1937, US physicist Isidor Rabi introduced a simple model to describe how atoms emit and absorb particles of light. Until now, this model had still not been completely explained. In a recent paper, physicists have for the first time used an exact numerical technique: the quantum Monte Carlo technique, which was designed to explain the photon absorption and emission phenomenon. These findings were recently published in EPJ D by Dr Flottat from the Nice –Sophia Antipolis Non Linear Institute (INLN) in France and colleagues. They confirm previous results obtained with approximate simulation methods.