Organizers: Tim O. Wehling (Bremen), Thomas Frauenheim (Bremen), Silke Biermann (Palaiseau Cedex), Johannes Lischner (London), Nikolay Prokofiev (Amherst, Massachusetts), Malte Schüler (Bremen), Andrew Millis (New York)
Venue: University of Bremen, Bremen Center for Computational Materials Science (BCCMS), Germany, 8th until 12th of October 2018
Sponsors: University of Bremen (BCCMS), Psi-k, DFG, CECAM
Electrons in real materials are subject to Coulomb interaction among each other. This interaction is long-ranged, gives rise to correlation effects, and often poses fundamental problems in ab initio simulations of real materials. A nowadays commonly used ab initio approach for strongly correlated materials is the augmentation of density functional (DFT) based methods with many-body treatments of the Hubbard model, such as the combination of DFT and dynamical mean field theory . This approach, however, neglects all correlation effects stemming from non-local Coulomb interaction, since the Hubbard model only includes the on-site part of the interaction. Combining more sophisticated diagrammatic ab initio methods (GW) with methods and models which contain the long-range contributions of the interaction (EDMFT)  alleviates these problems in part but comes with the introduction of further approximations. Assessing the quality of such approaches is currently hampered by the fact that even the extended Hubbard model, which is the minimal many-body model capturing explicitly non-local interactions, is at best partially understood.Continue reading Report: CECAM / PSI-K Workshop Bremen on Correlated electron physics beyond the Hubbard model→
The fourth Berlin edition of the “HoW exciting! Workshop on excitations in solids” took place in the Campus Adlershof of the Humboldt-Universität zu Berlin between July 31st to August 9th, 2018. Excitations in solids, which were the core topic of the workshop, are among the most exciting phenomena in condensed-matter physics. In this context, the electronic-structure approach provided by density-functional theory (DFT) is only the first level in a hierarchical set of models which are needed to quantitatively describe and understand these phenomena in real materials. The main goal of the “HoW exciting! Workshop on excitations in solids” was to address these issues and to establish a robust relationship between the most recent advances in theoretical and computational methods and the different domains of applicability with respect to experiments. Specifically, in this workshop the state-of-the-art of theoretical and computational approaches to describe different kinds of excitations (optical, magnetic, vibrational, etc.) in solid-state materials were presented. Future perspectives of these methodologies and their applications in different research fields were discussed and new connections between theoretical and experimental groups, who are investigating excitations in materials from different perspectives were established. The main topics spanned the whole range of first-principles methods for excitation processes in solids, including electronic excitations, electron-phonon coupling, core-excitations, and non-equilibrium processes. Continue reading SCIENTIFIC REPORT ON “HOW EXCITING! WORKSHOP ON EXCITATIONS IN SOLIDS HUMBOLDT-UNIVERSITÄT ZU BERLIN”, BERLIN, GERMANY, JULY 31 – AUGUST 9, 2018→
The psi-k sponsored Physics by the Lake Workshop in Theoretical Condensed Matter ran in Cumberland Lodge, Windsor UK from July 30th through August 10th 2018
The course lecturers at the meeting were Sam Carr, Edward McCann, Richard Blythe, Chris Hooley, Martin Lueders, Andrew Fisher, Bartek Waclaw, Buddhapriya Chakrabarti, with technical demonstrators Raul Santos and Miriam Marques
Seminar speakers were Graeme Ackland, Mike Payne, Julie Staunton, Raul Santos Alexandre Zagoskin and Mike Gunn
With the advent of nanoscale physics and ultrafast lasers it is now possible to directly probe real-time the correlated motion of electrons and nuclei in excited quantum states. In addition, the intensity and profile of the laser field can be tuned to control and manipulate the opto-electronic properties of a wide range of molecules and materials. All these progresses have opened new fields of research like, e.g., molecular transport, nanoelectronics, atto-physics/chemistry, nonequilibrium phase transitions, ultracold atomic gases, optimal control theory, etc.
Experiments are usually carried on large molecules, biological systems and nanostructures whose peculiar dynamical properties are inevitably linked to their atomistic structure. Thus, an ab-initio, time-dependent and quantum-mechanical approach is required for reliable calculations. The aim of this workshop was to gather together many of the most prominent theoretical and experimental scientists to advance our fundamental understanding of matter under extreme nonequilibrium conditions. Particular emphasis was given to many-body methods like Nonequilibrium Green’s Functions Theory (NEGF) and how to combine NEGF with ab initio methods like Density Functional Theory.
32 speakers and participants took part in the Psi-k, CCP-magnetism and CECAM financed Workshop on the subject of Ab Initio Spin Modelling, which was held at CECAM-HQ, Lausanne, between 26—28 November 2018. The format of the event was designed to foster discussion between groups working on diverse problems in the ab initio treatment of magnetism in solids. Talks of approximately one hour by the invited speakers were interspaced with much lively and enjoyable discussion. The long talks were intended to allow detailed, in depth presentations and this was indeed the outcome. The speakers represented work in quite different methods with electronic structure (e.g., from fully relativistic KKR to perturbation theory based on pseudopotentials/plane waves) – this seemed, if anything, to motivate and promote questions and active involvement by all the participants. Productive discussion also took place during the poster sessions where the quality of the poster presentations was extremely high.
The Psi-k sponsored “CAMD Summer School 2018 Electronic Structure Theory and Materials Design” took place in the week August 12-17, 2018 at Strandhotel Marienlyst in Helsingør, Denmark. Thanks to the more than 100 external attentive summer school students and the 15 very helpful invited lecturers, the school was the nice success that we had hoped for. The school taught PhD students from all over the world the basic and more advanced concepts in modern electronic structure theory including ground state density functional theory (DFT), many-body methods materials informatics and machine learning. Emphasis was put on the methodology applied “on-top” of ab-initio calculations which is essential for the computational design of new functional materials.
Organizers: J. K. Dewhurst, E. K. U. Gross, and S. Sharma
The Psi-k funded Elk-code tutorial took place at the Max Planck Institute of Microstructure Physics (MPI-Halle) in Halle, Germany, from September 3 – 7, 2018. There were a total of 14 speakers and tutors of the code and 45 students from 16 countries. We were oversubscribed and ,unfortunately, had to turn down several applicants (we received in total 61 requests for attending the Elk-tutorials).
The Elk LAPW
code (http://elk.sourceforge.net/) is an electronic structure code based on the state-of-the-art
full-potential linearized augmented plane-wave (LAPW)
method. It was designed from the start to be a user- and
developer-friendly code, allowing PhD students and post-docs to both use the code for their research as well as implement new ideas in the field of electronic structure.
The present Elk-tutorial was fourth in the series of tutorials. The previous tutorials were held in 2011, 2013 and 2015. The aims of the tutorials have been introduction to the ELK code as well as the cutting edge science and implementations in the field of electronic structure methods.
September 25, 2017 – September 29, 2017
Hotel Promenade, Montesilvano, Pescara (Italy)
Silvia Picozzi (Consiglio Nazionale delle Ricerche CNR-SPIN, Italy)
Stefan Blügel (Forschungszentrum Jülich, Germany)
Ingrid Mertig (Martin Luther University Halle, Germany)
The main purpose of this Psi-k/CECAM research conference (with about 110 participants) has been to highlight the very recent theoretical and computational developments related to the interplay of spin-orbit interaction with electronic structure, magnetism, transport as well as its link to strongly correlated materials and ultrafast currents in diverse materials. We have focused on discussing spin-orbit coupling (SOC) as a means of engendering fundamentally novel physical phenomena in exotic systems. The Conference therefore spanned several research dimensions, ranging from Materials (in the form of bulk compounds, surfaces and interfaces, thin films and heterostructures) to Functionalities (associated with topology, spin-momentum locking, valley degrees of freedom, skyrmions, coupling to electric currents by Berry phases, etc.) to method developments (in terms of dynamical processes in out-of-equilibrium quantum matter, Berry phase physics, etc). A brainstorm about concepts and ideas in a little understood phenomenon, such as orbital magnetization, was carried out under the guidance of Prof. Ivo Souza. While the main focus was on ab initio simulations, a few leading scientists in experiments were invited (Prof. Stuart Parkin, Prof. Claudia Felser, etc) and a strong interface to many-body physics treated on the basis of realistic model Hamiltonians was included.
Title: Emerging Technologies in Scientific Data Visualisation Location: CECAM-IT-SISSA-SNS Node, in Scuola Normale Superiore (Pisa, Italy) Webpage with list of participants, schedule and abstracts of presentations:https://www.cecam.org/workshop-1586.html
Dates: April 4, 2018 to April 6, 2018 Organizers:
Stefano de Gironcoli (International School for Advanced Studies (SISSA) and CNR-DEMOCRITOS IOM, Trieste, Italy)
Visualisation allows us to tap into high-bandwidth cognitive hierarchies of our brains and allows us to process high densities of information at once. In the field of atomistic and molecular simulations, it is a key element to research: we use ball-and-stick figures to represent the simulation scenarios, graphs to recognize or communicate parametric relationships of equations. The “Big Data” trend gave rise to several projects with vast output of data, many data-driven approaches are being introduced. For instance, a new EU Center of Excellence, “NOMAD”, is established to collect, store and regularize data to build a materials encyclopedia. Continue reading Report on CECAM Workshop: “Emerging Technologies in Scientific Data Visualisation”.→
Ab initio (from electronic structure) calculation of complex processes in materials