Opendata, web and dolomites


COUPE - COUPling Excitations

Total Cost €


EC-Contrib. €






 COUPE project word cloud

Explore the words cloud of the COUPE project. It provides you a very rough idea of what is the project "COUPE" about.

transitions    improvement    couples    superconducting    sources    relies    model    density    limitations    satellites    few    dependent    striking    perturbation    dominant    whereas    condensed    magnetic    exist    inhomogeneous    gw    boson    interpretation    kinds    signatures    interaction    proposes    interpreted    functional    exciton    homogeneous    gas    latter    preliminary    time    coupled    previously    secondary    excitations    systematic    particle    coupling    describe    describes    spectra    phonon    first    pertinent    peaks    material    approximation    ubiquitous    theory    bosons    confirm    synchrotron    spectroscopic    couple    structures    series    soleil    bosonic    cumulant    ct    severe    materials    precise    electron    resort    spin    pure    quasiparticle    led    paris    resolution    signature    tddft    modern    followed    description    characterization    fact    combination    interactions    body    radiation    envisaged    excitation    consist    linked    expansion    inaccessible    plasmon    discoveries    quasiparticles    coupe    simulation    quasi    science    connector   

Project "COUPE" data sheet

The following table provides information about the project.


Organization address
postcode: 91128

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country France [FR]
 Total cost 184˙707 €
 EC max contribution 184˙707 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2019
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2020
 Duration (year-month-day) from 2020-05-01   to  2022-04-30


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    ECOLE POLYTECHNIQUE FR (PALAISEAU CEDEX) coordinator 184˙707.00


 Project objective

Spectroscopic characterization of matter is ubiquitous in modern material science. Increased resolution and precise control over radiation sources have led to numerous discoveries of previously inaccessible spectroscopic signatures, often linked to complex excitation processes. The main challenge in their interpretation is the fact that excitations are coupled through interactions. A striking signature for this is that spectra often consist of one or more dominant peaks (called quasi-particle), followed by a series of secondary structures (called satellites). The latter, which can be very strong, are pure interaction effects and may be interpreted in terms of coupling of a quasiparticle to a bosonic excitation of the material: a plasmon, exciton, phonon, or any other boson. To solve the electron-boson problem, and, first of all, to set up the description in terms of the most pertinent quasiparticles and bosons, is a major challenge of condensed matter theory. COUPE will face this challenge. Today, quasiparticles are most often described in the GW approximation to many-body perturbation theory, whereas for bosonic excitations one can resort to time-dependent density-functional theory (TDDFT). Only a few approaches exist to describe the coupled problem, with severe limitations. For example, a cumulant expansion on top of GW describes plasmon satellites, but cannot couple to spin excitations, and there is yet no systematic way for improvement. COUPE proposes a new combination of GW and TDDFT which couples quasiparticles to all kinds of bosonic excitations. This combination relies on a recently developed “connector theory” (CT), which allows using results from the homogeneous electron gas to describe inhomogeneous materials. COUPE will further apply it to the simulation of phase transitions in magnetic and superconducting materials under study at the synchrotron SOLEIL in Paris. Preliminary model results confirm the great potential of the approach envisaged in COUPE.

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The information about "COUPE" are provided by the European Opendata Portal: CORDIS opendata.

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