Long-Range Order in Electronic Transport through Disordered Metal Films

Ultracold atom magnetic field microscopy enables the probing of current flow patterns in planar structures with unprecedented sensitivity. In polycrystalline metal (gold) films we observe long-range correlations forming organized patterns oriented at +/- 45 deg relative to the mean current flow, even at room temperature and at length scales orders of magnitude larger than the diffusion length or the grain size. The preference to form patterns at these angles is a direct consequence of universal scattering properties at defects. The observed amplitude of the current direction fluctuations scales inversely to that expected from the relative thickness variations, the grain size and the defect concentration, all determined independently by standard methods. This indicates that ultracold atom magnetometry enables new insight into the interplay between disorder and transport

Manifestly Gauge Covariant Treatment of Lattice Chiral Fermions. II

We propose a new formulation of chiral fermions on a lattice, on the basis of a lattice extension of the covariant regularization scheme in continuum field theory. The species doublers do not emerge. The real part of the effective action is just one half of that of Dirac-Wilson fermion and is always gauge invariant even with a finite lattice spacing. The gauge invariance of the imaginary part, on the other hand, sets a severe constraint which is a lattice analogue of the gauge anomaly free condition. For real gauge representations, the imaginary part identically vanishes and the gauge invariance becomes exact.Comment: 15 pages, PHYZZX. The title is changed. The final version to appear in Phys. Rev.

Analysis of a diffusive effective mass model for nanowires

We propose in this paper to derive and analyze a self-consistent model describing the diffusive transport in a nanowire. From a physical point of view, it describes the electron transport in an ultra-scaled confined structure, taking in account the interactions of charged particles with phonons. The transport direction is assumed to be large compared to the wire section and is described by a drift-diffusion equation including effective quantities computed from a Bloch problem in the crystal lattice. The electrostatic potential solves a Poisson equation where the particle density couples on each energy band a two dimensional confinement density with the monodimensional transport density given by the Boltzmann statistics. On the one hand, we study the derivation of this Nanowire Drift-Diffusion Poisson model from a kinetic level description. On the other hand, we present an existence result for this model in a bounded domain

Education and innovation - vet students into technology companies

VET education is an effective and accessible way for students, to improve their employability and inclusion possibilities. It allows them to train technically in a short time to do a job and try to access the labor market. However, not even obtaining a qualification aimed at vocational training ensures access to the labor market or real possibilities of emancipation. The success of VET graduates in their first work experience joining technology companies requires the development of many skills that are common to all professional careers, but also specific skills that derive from the innovative nature of the work method and objectives of these companies. For this reason, within the framework of the Erasmus + Program, the project VET STUDENTS İNTO TECHNOLOGY COMPANİES: A VET students mobility network in the technological sector through a virtual environment with specific materials for critical thinking is being developed with the aim of promoting employability and inclusion of VET students at risk of exclusion. The project focuses on the creation of virtual tools, collaborative work methodologies and virtual training materials that allow these young people to improve their critical thinking capacity and their technological and digital skills. The project's methodology is based on the combination of the creation of training materials and a network of mobility in high-tech centres, where students will carry out a first work experience. Regarding training materials, one of the main results of this project is PERSONALIZED DIGITAL COURSE FOR LABOR TRAINING IN A TECHNOLOGICAL CENTER. This course generates personalized learning based on the student's previous knowledge and the characteristics of the technological company in which they will carry out their internship. The course follows an innovative methodology based on microlearning, a learning characterized by the resolution of relatively small exercises (pills) that are focused on the development of technical and work skills and the reinforcement of critical thinking as a fundamental mechanism. The objective of this course is not so much to provide new knowledge as to develop skills that allow the students to face problems or tasks unknown to them until then: self-training skills, assess their own way of reasoning, set objectives, raise relevant questions, state hypothesis, search for information, intellectual integrity, oral and written communication, work in multidisciplinary teams. Along with this course, within the framework of this project, the result ON YOUR SIDE is being developed, a digital educational software available for mobile devices, which will accompany the student throughout the mobility process, providing useful information such as specific training resources focused on the company where they will carry out their mobility, linguistic resources, collaborative work tools, as well as social integration resources in the destination country, among others. From this App, students will be able to access the aforementioned course. In this paper we present how, through microlearning methodology and critical thinking, students can solve the content pills through their autonomy and self-discovery.This work has been funded by the Erasmus + program within the 2019-1-ES01-KA202-064569 project, Spanish Service for the Internationalization of Education (SEPIE

VET students into technology companies: a microlearning digital course to train critical thinking skills

This microlearning course is designed to support VET graduates or students, especially those with fewer opportunities, who join a technology company at the beginning of their professional career. It has been developed within the framework of the Erasmus + project “VET STUDENTS İNTO TECHNOLOGY COMPANİES: A VET students mobility network in the technological sector through a virtual environment with specific materials for critical thinking”. This is an intiative co-financed by the Erasmus + Programme, with a personalized digital course format, to take into account both the previous training of the VET student or graduate and the type of company they will join. The course has in its sights to develop in the VET student the specific competences required by the technology company to address the problems typical of fields of leading technology innovation, as well as fitting in multidisciplinary teams. To do this, this course generates an innovative methodology in which the education itinerary is built based on previous knowledge of the student and the needs and work field of the technology company. Besides its contents strengthen critical thinking as an essential mechanism for work in both dynamic and technology sectors. For that purpose, the student is asked a series of questions in the form of problems that, in addition to being related to the study plans of VET studies, require for their solution the search for information, its analysis and many times the making of a decision or adopting a personal position on it. We aim with our training projects, within the Erasmus + program, to convince students that they are capable of going further and further in the development of their professional skills being the technology sector an acceptable option for them, making their work increasingly valuable for their inclusion, for their own personal development, for that of the company in which they work and for society. But for this certain skills are required, and one of the most important is learning to learn autonomously and to accurately analyse the information received and the decisions that are made from it. It is generally true that the problems that one encounters in professional practice are not going to be the ones that you were taught in your VET studies. Vocational training has to head for equipping students with the necessary tools to face the new problems that they will face in their job and to grow professionally every day. We intend to show how valuable critical thinking skills are in analysing our way of thinking and making decisions. In this paper we present examples of the exercises included in the course, how their approach and the processes that have led to a solution relate with the standards of critical thinking and the different levels of help that are offered to the student for their solution. The course is accessible from a digital educational software “ON YOUR SIDE: VIRTUAL ASSISTANT FOR EUROPEAN MOBILITIES IN TECHNOLOGICAL CENTERS” developed in the framework of this Erasmus+ project in order to develop cooperative work between students with fewer opportunities doing their internships in technology companies and their inclusion in new job posts. We will also present this software in a very summarized way in this article.This work has been funded by the Erasmus + program within the 2019-1-ES01-KA202-064569 project, Spanish Service for the Internationalization of Education (SEPIE

Single hadron response measurement and calorimeter jet energy scale uncertainty with the ATLAS detector at the LHC

The uncertainty on the calorimeter energy response to jets of particles is derived for the ATLAS experiment at the Large Hadron Collider (LHC). First, the calorimeter response to single isolated charged hadrons is measured and compared to the Monte Carlo simulation using proton-proton collisions at centre-of-mass energies of sqrt(s) = 900 GeV and 7 TeV collected during 2009 and 2010. Then, using the decay of K_s and Lambda particles, the calorimeter response to specific types of particles (positively and negatively charged pions, protons, and anti-protons) is measured and compared to the Monte Carlo predictions. Finally, the jet energy scale uncertainty is determined by propagating the response uncertainty for single charged and neutral particles to jets. The response uncertainty is 2-5% for central isolated hadrons and 1-3% for the final calorimeter jet energy scale.Comment: 24 pages plus author list (36 pages total), 23 figures, 1 table, submitted to European Physical Journal

Measurement of the cross-section and charge asymmetry of WW bosons produced in proton-proton collisions at s=8\sqrt{s}=8 TeV with the ATLAS detector

This paper presents measurements of the $W^+ \rightarrow \mu^+\nu$ and $W^- \rightarrow \mu^-\nu$ cross-sections and the associated charge asymmetry as a function of the absolute pseudorapidity of the decay muon. The data were collected in proton--proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS experiment at the LHC and correspond to a total integrated luminosity of 20.2~\mbox{fb^{-1}}. The precision of the cross-section measurements varies between 0.8% to 1.5% as a function of the pseudorapidity, excluding the 1.9% uncertainty on the integrated luminosity. The charge asymmetry is measured with an uncertainty between 0.002 and 0.003. The results are compared with predictions based on next-to-next-to-leading-order calculations with various parton distribution functions and have the sensitivity to discriminate between them.Comment: 38 pages in total, author list starting page 22, 5 figures, 4 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-13

Search for chargino-neutralino production with mass splittings near the electroweak scale in three-lepton final states in √s=13 TeV pp collisions with the ATLAS detector

A search for supersymmetry through the pair production of electroweakinos with mass splittings near the electroweak scale and decaying via on-shell W and Z bosons is presented for a three-lepton final state. The analyzed proton-proton collision data taken at a center-of-mass energy of √s=13  TeV were collected between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 139  fb−1. A search, emulating the recursive jigsaw reconstruction technique with easily reproducible laboratory-frame variables, is performed. The two excesses observed in the 2015–2016 data recursive jigsaw analysis in the low-mass three-lepton phase space are reproduced. Results with the full data set are in agreement with the Standard Model expectations. They are interpreted to set exclusion limits at the 95% confidence level on simplified models of chargino-neutralino pair production for masses up to 345 GeV

Standalone vertex finding in the ATLAS muon spectrometer

A dedicated reconstruction algorithm to find decay vertices in the ATLAS muon spectrometer is presented. The algorithm searches the region just upstream of or inside the muon spectrometer volume for multi-particle vertices that originate from the decay of particles with long decay paths. The performance of the algorithm is evaluated using both a sample of simulated Higgs boson events, in which the Higgs boson decays to long-lived neutral particles that in turn decay to bbar b final states, and pp collision data at √s = 7 TeV collected with the ATLAS detector at the LHC during 2011