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Articles by Philipp Werner
Plasmon assisted superconductivity in LiTi 2 O 4
Abstract We combine GW plus extended dynamical mean field theory (GW+EDMFT) with the density functional theory for superconductors (SCDFT) framework to study the electronic properties of LiTi2O4. Excellent agreement with experiment is obtained for the density of states, mass enhancement, Sommerfeld coefficient and superconducting Tc, if the dynamical nature of the screened Coulomb interaction is taken into account.
European Commission's Proposed Cloud Sovereignty Framework Creates New Compliance Tiers for Software Providers | JD Supra
The Situation: On June 3, 2026, the European Commission ("EC") published the proposed EU Cloud and AI Development Act ("CADA") as part of its broader Tech Sovereignty Package. At its core, CADA establishes a four-level assurance framework for cloud sovereignty. The Result: The framework creates immediate and material implications for U.S. hyperscalers, enterprise software providers, and platform businesses alike.
EU Proposes Tech Sovereignty Package with Major Implications for Digital Markets | JD Supra
The European Commission's new legislative package introduces significant measures across semiconductors, cloud, AI, open source, and data centers that will reshape the regulatory landscape for technology companies operating in Europe. On June 3, 2026, the European Commission proposed the European Technological Sovereignty Package, marking a significant shift in the European Union's approach to reducing its dependence on non-EU technology providers.
Germany's 12th GWB Amendment: A Paradigm Shift for Merger Control or Just Catching Up?
On 4 June 2026, the German Federal Ministry for Economic Affairs and Energy published the long-awaited draft 12th Amendment to the Act Against Restraints of Competition ("ARC" or "GWB"). The draft bill ("Referentenentwurf") implements the coalition agreement between CDU, CSU, and SPD for the 21st legislative period, which committed the new government to ensuring the effective application of competition law while making proceedings faster and more efficient.
German Competition Authority Fines Amazon For Allegedly Influencing Prices Of Third-Party Sellers On Amazon Marketplace
Jürgen Beninca’s articles from Jones Day are most popular: in European Union in European Union with readers working within the Property and Construction & Engineering industries Jones Day are most popular: within Accounting and Audit topic(s) In a landmark ruling, the German Bundeskartellamt fined Amazon EUR 59 million ($70 million) and prohibited Amazon from discriminating against third-party sellers for offering prices Amazon deems too high.
Momentum-resolved fingerprint of Mottness in layer-dimerized Nb3Br8 - Nature Communications
Abstract Crystalline solids can become band insulators due to fully filled bands, or Mott insulators due to strong electronic correlations. While Mott insulators can theoretically occur in systems with an even number of electrons per unit cell, distinguishing them from band insulators experimentally has remained a longstanding challenge.
EU Foreign Subsidies Regulation: European Commission Launches Consultation On Guidelines
The European Commission seeks stakeholders' views on the guidelines for the application of the Foreign Subsidies Regulation ("FSR"). Key Aspects of the Substantive Assessment Under the FSR The substantive FSR review essentially follows a three-step test: (i) assessing whether a foreign subsidy distorts the EU market; (ii) weighing the foreign subsidy's negative effects against its positive impacts ("balancing test"); and (iii) imposing remedies if necessary.
EU Foreign Subsidies Regulation: European Commission Launches Consultation on Guidelines
The European Commission seeks stakeholders' views on the guidelines for the application of the Foreign Subsidies Regulation ("FSR"). Key Aspects of the Substantive Assessment Under the FSR The substantive FSR review essentially follows a three-step test: (i) assessing whether a foreign subsidy distorts the EU market; (ii) weighing the foreign subsidy's negative effects against its positive impacts ("balancing test"); and (iii) imposing remedies if necessary.
Theory of ultrafast screening of $U$ in driven charge-transfer insulators: A time-resolved x-ray absorption study
Recent seminal experiments have utilized time-resolved x-ray absorption spectroscopy (XAS) to investigate the ultrafast photoinduced renormalization of the electron interaction (“Hubbard ”) in Mott and charge transfer insulators. In this paper, we theoretically analyze the change of interactions due to dynamical screening as it is encoded in the XAS signal, using the nonequilibrium formalism.
Quantification of Synergistic Two‐Color Covalent Bond Formation
Supporting Information As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors.
The EC Issues Guidance On Assessing Market Distortions Under The Foreign Subsidies Regulation
The Situation: The European Commission ("EC") has released its first guidance on assessing market distortions under the Foreign Subsidies Regulation ("FSR"). The Result: The Commission Staff Working Document offers some initial guidance and clarifications on the interpretation of the distortion of the internal market and the application of the balancing test. Looking Ahead: Important questions of interpretation and application of central concepts remain open.
Photoinduced insulator-metal transition in paramagnetic ${({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x})}_{2}{\mathrm{O}}_{3}$
Pump-probe experiments with femtosecond time resolution can be used to disentangle the electronic dynamics from the lattice response and thus provide valuable insights into the nonequilibrium behavior of correlated materials. In Cr-doped V2O3, a multiorbital Mott-Hubbard material which has been intensively investigated for decades, time-resolved experiments reported a photoinduced insulator-metal transition leading to a transient metal state with nonthermal properties.
Quaternary borocarbides: A testbed for DFT for superconductors
Using ab initio density functional theory for superconductors (SCDFT), we systematically study the quaternary borocarbides RM2B2C. Treating the retarded (frequency-dependent) interaction W(ω) within the random-phase approximation, we find good agreement with experiments for the calculated superconducting critical temperature Tc in the nonmagnetic Ni- and Pd-based compounds.
Nature of the photoinduced metallic state in monoclinic ${\mathrm{VO}}_{2}$
The metal-insulator transition of VO2, which in equilibrium is associated with a structural phase transition, has been intensively studied for decades. It is challenging to disentangle the role of Mott physics from dimerization effects in the insulating phase. Femtosecond time-resolved experiments showed that optical excitations can induce a transient metallic state in the dimerized phase, which is distinct from the known equilibrium phases.
Nonequilibrium diagrammatic many-body simulations with quantics tensor trains
The nonequilibrium Green's function formalism provides a versatile and powerful framework for numerical studies of nonequilibrium phenomena in correlated many-body systems. For calculations starting from an equilibrium initial state, a standard approach consists of discretizing the Kadanoff-Baym contour and implementing a causal time-stepping scheme in which the self-energy of the system plays the role of a memory kernel.
Maximum entropy analytic continuation of anomalous self-energies
The anomalous self-energy plays an important role in the analysis of superconducting states. Its spectral weight provides information on the pairing glue of superconductors, but it can change in sign. In many numerical approaches, for example, Monte Carlo methods based on the Nambu formalism, the anomalous self-energy is obtained on the Matsubara axis, and nonpositive spectral weight cannot be directly obtained using the standard maximum entropy analytic continuation method.
Correlated electronic structure of ${\mathrm{Pb}}_{10\ensuremath{-}x}{\mathrm{Cu}}_{x}{({\mathrm{PO}}_{4})}_{6}\mathrm{O}$
Recently, above-room-temperature superconductivity was reported in the Cu-doped lead apatite Pb10−xCux(PO4)6O, dubbed LK-99. By relaxing the structure with Cu substitution, we derive a four-band low-energy model with two 3/4 filled bands of predominantly Cu−dxz,yz character and two filled O−px,y bands. This model is further downfolded to a two-band Cu−dxz/yz model.
Nonthermal superconductivity in photodoped multiorbital Hubbard systems
Superconductivity in laser-excited correlated electron systems has attracted considerable interest due to reports of light-induced superconductinglike states. Here we explore the possibility of nonthermal superconducting order in strongly interacting multiorbital Hubbard systems, using nonequilibrium dynamical mean field theory.
JONES DAY TALKS® - Charting the Course: Antitrust's Past, Present, and Future in Labor Markets
Click here to listen to the audio. Antitrust enforcement in labor markets continues to escalate worldwide. Jones Day partners Kevin Hart and Philipp Werner talk about the continuing crackdown on anticompetitive labor practices in the U.S. and across the EU, review recent developments in case law, and explain what employers need to know.
Quantum Optics Measurement Scheme for Quantum Geometry and Topological Invariants
We show how a quantum optical measurement scheme based on heterodyne detection can be used to explore geometrical and topological properties of condensed matter systems. Considering a 2D material placed in a cavity with a coupling to the environment, we compute correlation functions of the photons exiting the cavity and relate them to the hybrid light-matter state within the cavity.
Dynamical mean-field approach to disordered interacting systems and applications to the quantum transport problem
We discuss a nonequilibrium dynamical mean-field framework for simulating inhomogeneous Hubbard models with local disorders. Our approach treats electron interactions and disorders on equal footing, by considering only local dynamical fluctuations. The theory reduces to nonequilibrium dynamical mean-field theory in the presence of only electron-electron interactions and to the coherent potential approximation in noninteracting systems with disorders.
Fermion quartets on the square lattice
We study a microscopic model for four spinless fermions on the square lattice which exhibits a quartet bound state in the strong coupling regime. The four-particle quantum states are analyzed using symmetry arguments and by introducing a zoo of relevant lattice animals.
Automated Electrodermal Activity and Facial Expression Analysis for Continuous Pain Intensity Monitoring on the X-ITE Pain Database
3.1. Database Prepossessing In this section, we provide an overview of the multimodal Experimentally Induced Thermal and Electrical (X-ITE) Pain Database [28], which we used to validate the performance of various automatic methods for continuous pain intensity recognition.
EU Adopts Reporting Requirements For Transactions And Public Bids Under The Foreign Subsidies Regulation - Antitrust, EU Competition - European Union
In Short The Situation: On July 10, 2023, the European Commission ("EC") adopted the Implementing Regulation ("IR") and the corresponding notification forms (Form FS-CO and Form FS-PP), which specify the information and documents companies will need to disclose as part of notifications under the Foreign Subsidies Regulation ("FSR").
Stochastic semiclassical theory for nonequilibrium electron-phonon coupled systems
Abstract We discuss a semiclassical approach to solve the quantum impurity model within nonequilibrium dynamical mean-field theory for electron-lattice models. The effect of electronic fluctuations on the phonon is kept beyond Ehrenfest dynamics, leading to a stochastic phonon evolution with damping and noise terms that are self-consistently determined by the electronic correlation functions in the fluctuating phonon field.
Dynamical mean field theory extension to the nonequilibrium two-particle self-consistent approach
Abstract Nonlocal correlations play an essential role in correlated electron systems, especially in the vicinity of phase transitions and crossovers, where two-particle correlation functions display a distinct momentum dependence. In nonequilibrium settings, the effect of nonlocal correlations on dynamical phase transitions, prethermalization phenomena, and trapping in metastable states is not well understood.
Time-resolved photoemission and resonant inelastic x-ray scattering study of a site-selective Mott insulator
Abstract Inspired by the physics of rare-earth nickelates, we study the photoemission (PES) and resonant inelastic x-ray scattering (RIXS) spectra of a correlated electron system with two types of insulating sublattices. Sublattice A is characterized by a hybridization gap and a low-spin state, while sublattice B features a Mott gap and a local magnetic moment.
$GW+\mathrm{EDMFT}$ investigation of ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{NiO}}_{2}$ under pressure
Abstract Motivated by the recent experimental observation of a large pressure effect on Tc in Pr1−xSrxNiO2, we study the electronic properties of this compound as a function of pressure for x=0 and 0.2 doping using self-consistent GW+EDMFT. Our numerical results demonstrate a nontrivial interplay between chemical doping and physical pressure, and small but systematic changes in the orbital occupations, local level energies, and interaction parameters with increasing pressure.
Vertex-Based Diagrammatic Treatment of Light-Matter-Coupled Systems
Abstract We propose a diagrammatic Monte Carlo approach for quantum impurity models, which can be regarded as a generalization of the strong-coupling expansion for fermionic impurity models. The algorithm is based on a self-consistently computed three-point vertex and a stochastically sampled four-point vertex, and it allows one to obtain numerically exact results in a wide parameter regime.
EU Foreign Subsidies Regulation Filings Mandatory Starting in October 2023 | JD Supra
The European Commission ("EC") has published the FSR in the Official Journal of the EU, meaning it will take effect on January 12, 2023, and notifications will become mandatory as of October 12, 2023. Although the prenotification requirements in M&A and public bids do not begin until October, the FSR empowers the EC to launch investigations as early as July 12, 2023.
EU Foreign Subsidies Regulation Filings Mandatory Starting in October 2023
The foreign subsidies regulation ("FSR") requires prenotification of certain large M&A transactions and public bids involving companies that receive subsidies from governments outside the European Union ("EU"). The European Commission ("EC") has published the FSR in the Official Journal of the EU, meaning it will take effect on January 12, 2023, and notifications will become mandatory as of October 12, 2023.
Nonequilibrium two-particle self-consistent approach
Abstract We present the nonequilibrium implementation of the two-particle self-consistent (TPSC) approach, which has been shown to provide a reliable equilibrium description of interacting lattice systems in the weak- and intermediate-correlation regime. This method captures the effects of local and nonlocal correlations in two- and higher-dimensional systems and satisfies the Mermin-Wagner theorem.
Dynamical mean-field study of a photon-mediated ferroelectric phase transition
Abstract The interplay of light and matter gives rise to intriguing cooperative effects in quantum many-body systems. This is even true in thermal equilibrium, where the electromagnetic field can hybridize with collective modes of matter, and virtual photons can induce interactions in the solid. Here, we show how these light-mediated interactions can be treated using the dynamical mean-field theory formalism.
Initial Tracking, Fast Identification in a Swarm and Combined SLR and GNSS Orbit Determination of the TUBIN Small Satellite
This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by Clément Jonglez *, Julian Bartholomäus , Philipp Werner and Enrico Stoll Chair of Space Technology, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany * Author to whom correspondence should be addressed.
Field-induced ultrafast modulation of Rashba coupling at room temperature in ferroelectric α-GeTe(111) - Nature Communications
Abstract Rashba materials have appeared as an ideal playground for spin-to-charge conversion in prototype spintronics devices. Among them, α-GeTe(111) is a non-centrosymmetric ferroelectric semiconductor for which a strong spin-orbit interaction gives rise to giant Rashba coupling. Its room temperature ferroelectricity was recently demonstrated as a route towards a new type of highly energy-efficient non-volatile memory device based on switchable polarization.
Superconductivity in black phosphorus and the role of dynamical screening
Abstract Simple cubic phosphorus exhibits superconductivity with a maximum Tc of up to 12 K under pressure. The pressure dependence of Tc cannot be consistently explained with a simple electron-phonon mechanism, which has stimulated investigations into the role of electronic correlations and plasmonic contributions. Here we solve the gap equation of density functional theory for superconductors using different electron-electron and electron-phonon contributions to the kernel.
European Union: EU Competition Enforcers Permit "Necessary And Temporary" Cooperation To Mitigate Disruption From Ukrainian Conflict 28 March 2022 by Philipp Werner , Yvan Desmedt , Mario Todino , Donald McGahn II , Philippe Laconte , Charlotte Breuvart and Marta Delgado Echevarría Jones Day Your LinkedIn Connections with the authors The European Competition Network ("ECN") issued a policy statement indicating that member agencies will not intervene in legitimate, cooperative efforts to...
EU Competition Enforcers Permit "Necessary and Temporary" Cooperation to Mitigate Disruption from Ukrainian Conflict | JD Supra
EU competition enforcers will not intervene in "necessary and temporary" cooperation to avoid or to mitigate severe disruptions caused by the conflict in Ukraine. The European Competition Network ("ECN") issued a policy statement indicating that member agencies will not intervene in legitimate, cooperative efforts to address disruptions caused by the conflict in Ukraine and related sanctions.
EU Adopts Revised Guidelines on State Aid for Climate, Environmental Protection and Energy
In Short The Development: The European Commission ("Commission") adopted new Guidelines on State Aid for Climate, Environmental Protection and Energy ("CEEAG") on 27 January 2022. The CEEAG revise criteria that the Commission will now apply to determine whether EU Member State financing to private companies in the field of climate, environmental protection, and energy is compatible with EU law.
EU Revises State Aid Rules for Important Projects of Common European Interest
In Short The Situation: The European Commission ("Commission") has adopted revised guidance setting out the criteria to assess Important Projects of Common European Interest ("IPCEI") under EU State aid rules ("Communication").
EU Revises State Aid Rules For Important Projects Of Common European Interest
To print this article, all you need is to be registered or login on Mondaq.com. In Short The Situation: The European Commission ("Commission") has adopted revised guidance setting out the criteria to assess Important Projects of Common European Interest ("IPCEI") under EU State aid rules ("Communication").
Black Boxes In Automobiles: European Union Requires Installation Of Event Data Recorders
European Union: Black Boxes In Automobiles: European Union Requires Installation Of Event Data Recorders 06 July 2021 by Ozan Akyurek (Paris) , Alexandre de Verdun (Paris), Amy Kläsener (Frankfurt) and Philipp Werner (Brussels) Jones Day Your LinkedIn Connections with the authors To print this article, all you need is to be registered or login on Mondaq.com.
France Plans On Adopting New Rules For Self-Driving Cars - Transport - France
France: France Plans On Adopting New Rules For Self-Driving Cars 12 April 2021 by Ozan Akyurek , Olivier Haas , Charles Moellenberg Jr. and Philipp Werner Jones Day Your LinkedIn Connections with the authors To print this article, all you need is to be registered or login on Mondaq.com. In Short The Background: In 2016, the French government authorized, for experimental purposes only, the deployment of autonomous vehicles?so-called "self-driving cars"?on public roads.
Nickelate superconductors: Multiorbital nature and spin freezing
Abstract Superconductivity with a remarkably high Tc has recently been found in Sr-doped NdNiO2 thin films. While this system bears strong similarities to the cuprates, some differences, such as a weaker antiferromagnetic exchange coupling and possible high-spin moments on the doped Ni sites have been pointed out.
Entropy-cooled nonequilibrium states of the Hubbard model
Abstract We show that the recently proposed cooling-by-doping mechanism allows one to efficiently prepare interesting nonequilibrium states of the Hubbard model.
Synthesis of trans-Isotactic Poly(norbornene)s through Living Ring-Opening Metathesis Polymerization Initiated by Group VI Imido Alkylidene N-Heterocyclic Carbene Complexes
The selectivity of several molybdenum and tungsten imido alkylidene N-heterocyclic carbene (NHC) complexes in the ring opening metathesis polymerization (ROMP) of enantiomerically pure endo,exo-2,3-dicarbomethoxynorborn-5-ene (DCMNBE) was examined by 1H- and 13C NMR spectroscopy. With one exception, all complexes showed a strong bias toward the formation of trans-isotactic polymers, some yielding polymers based on >98% trans-isotactic repeat units.
Multi-Modal Signals for Analyzing Pain Responses to Thermal and Electrical Stimuli
Behavior Unable to load video. Please check your Internet connection and reload this page. If the problem continues, please let us know and we'll try to help. An unexpected error occurred. Please check your Internet connection and reload this page. If the problem continues, please let us know and we'll try to help. Summary This article focuses on the experimental elicitation of pain through heat (thermal) and electrical stimulation while recording physiological, visual, and paralinguistic responses.
Unfair Data Protection Practices May Constitute an Abuse of Market Power | JD Supra
Updated: May 25, 2018: JD Supra is a legal publishing service that connects experts and their content with broader audiences of professionals, journalists and associations.
Connected Cars and Autonomous Driving - EU Antitrust Challenges (Part II) | Lexology
The Background: The automotive industry has achieved a number of technological advances aimed at developing connected cars, automated vehicles, and ultimately autonomous driving. These innovations are expected to pose a series of legal challenges, including those related to competition law. The Issue: Smart cars will collect, process, and store huge amounts of data.
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