DTU Chemistry’s Post

Polarized #neutrons can provide unique information on the structure and dynamics of #materials, especially #quantum materials. When conducting spin-echo small-angle neutron scattering experiments it is generally thought that the spin up and spin down components of polarized neutrons coexist in the same spot. However, a recent work strongly suggests that both components are spatially separated (yet entangled) questioning the validity of the conventional Larmor precession model when applied to polarized neutrons. This interesting result was obtained by #SCGSR awardee Samuel McKay in collaboration with Dr. Abu Irfan, Quan Le Thien, Prof. Gerardo Ortiz, and Prof. Roger Pynn of Indiana University Bloomington, Niels Geerits from the Technical University of Vienna, Dr. Steven Parnell from Delft University of Technology, Dr. Robert Dalgliesh from Rutherford Appleton Laboratory, Dr. Nickolay Lavrik, and Dr. Ivan Kravchenko from Oak Ridge National Laboratory. Check out their interesting article at: https://lnkd.in/gChJ4ktU Applications for the 2024 SCGSR awards are about to close! The submission deadline is this Wednesday May 1, 2024 at 5:00 PM ET. If you are a #PhDstudent: apply now and contribute to pushing the boundaries of science. If you know a PhD student who may be interested in conducting part of their thesis research at a #DOE National Lab, please tell them to check out the SCGSR program at: https://lnkd.in/eKDGfTA

Transitioning from theoretical studies during my PhD to experimental research in my postdoc was a significant challenge, but I try to do it. I’m happy to share my first experimental paper from my postdoc period! I would like to thank my supervisor Chen Wang and co-authors Yingying Wang, Tal Sheffer for their invaluable contributions throughout all phases of this work. We report observations of discrete charge states of a coherent two-level system (TLS) that is strongly coupled to an offset-charge-sensitive superconducting transmon qubit. We measure an offset charge of 0.072⁢𝑒 associated with the two TLS eigenstates, which have a transition frequency of 2.9 GHz and a relaxation time exceeding 3 ms. Combining measurements in the strong dispersive and resonant regime, we quantify both transverse and longitudinal coupling of the TLS-qubit interaction. We further perform joint tracking of TLS transitions and quasiparticle tunneling dynamics but find no intrinsic correlations. This Letter demonstrates microwave-frequency TLS as a source of low-frequency charge noise.

🌟 We are happy to announce Prof. Tibor Grasser’s presentation at the IEEE International Reliability Physics Symposium (IRPS) 🌟 It has recently been observed that bipolar switching between accumulation and inversion can result in an unexpected threshold voltage drift in SiC MOSFETs. This gate switching instability (GSI) is characterized by power-law time exponents significantly larger than what is known for bias temperature instability (BTI).  Since the bias, frequency, and temperature dependence of GSI are the same as what is seen in charge pumping experiments, we stipulate that recombination events at the interface lead to recombination enhanced defect reactions (REDR) via a "phonon kick", which can eventually lead to a large degradation. In his presentation, he will show and discuss a comprehensive physical model for GSI that is based on these observations and validate it against detailed experimental data. Prof. Grasser is looking forward to insightful discussions and sharing groundbreaking insights with fellow researchers! Don't miss it! #IRPS2024 #SiCMOSFET #IuE2024 #innovation #BTI #GSI

🎉 I am thrilled to share the exciting news that the main results of my PhD research have been accepted for publication in Physical Review Letters! This is a major achievement as it represents the first results in the search for Dark Sectors and light Dark Matter with a muon beam using the missing energy-momentum technique. You can find the accepted paper here: [https://lnkd.in/emZGPavc] 🔍 These findings contribute significantly to the ongoing experimental program of the NA64 collaboration at the CERN Super Proton Synchrotron. They provide new insights and constraints on the parameter space related to the thermal Dark Matter relic abundance. For more details about the experimental methods and data analysis, you can refer to the pre-print document: [https://lnkd.in/e22ekJjA] 📖 A comprehensive overview of the research can be found in my thesis: [https://lnkd.in/eMuG3uQh] I am immensely grateful for the support, help, and guidance of my thesis supervisors, Prof. Dr. Paolo Crivelli and Dr. Laura Molina Bueno, as well as the dedicated work and collaboration of my NA64 colleagues. #PhysicalReviewLetters #HighEnergyPhysics #DarkMatter #DarkSectors #CERN

Hooray! It is high time to announce that our research has been published in the Journal of Materials Research! https://lnkd.in/g4zsdc6j Our paper, titled "A study on the role of construction methods of an edge dislocation on final arrangements of atoms via MD simulations," explores the significance of different methods used to create an edge dislocation in FCC pure Aluminum using Molecular Dynamics simulations. We examined various techniques and their impact on atomic configurations after equilibrium, highlighting the importance of initial configurations in shaping the interatomic forces for successful dislocation creation. I want to extend my gratitude to my co-authors, Prof. Mohammad Habibi Parsa and Prof. Reza Roumina, for their invaluable contributions. This research could not have been completed without their guidance. Please feel free to reach out if you’d like to discuss the findings! #Dislocation #MolecularDynamics #ComputationalMaterialsScience

✨ …and just like that - the last arc is in the tunnel of the Swiss Light Source SLS! ✨   The SLS is currently undergoing a major modernisation programme that will significantly increase the density of the X-ray light. The upgrade began in September 2023 and promises an improvement in emittance of up to a factor of 40. Now the last of the 12 arcs that together form the new diffraction-limited storage-ring (DLSR) is installed in the tunnel, leading us into the final months of the 💫 SLS 2.0 upgrade project.   The SLS is the only research facility in Switzerland 🇨🇭 that uses synchrotron light for scientific experiments in many fields, including physics, materials science, chemistry, biology and medicine.   #UpgradingSLS #SLS2.0 #LightSourceScience #ExcitedAboutSLS

🌟 My Recent PTEP Publication! 🌟 I am delighted to announce that my recent work, "TMD Relations: Insights from a Light-Front Quark–Diquark Model," has been published in the prestigious JPS journal, Progress of Theoretical and Experimental Physics (PTEP). This study establishes relationships between T-even transverse-momentum-dependent parton distributions (TMDs) at all twist levels (up to twist-4) using the light-front quark–diquark model. Notably, for the first time, we present a parameterization table linking TMDs to the helicity states of the proton, making it easier to recognize and derive TMDs. The research also explores linear and quadratic relationships of TMDs at intra- and inter-twist levels and examines the inequality relations these distributions follow. This publication marks a significant step in understanding proton structure and highlights the strength of theoretical modeling in hadron physics. I am deeply grateful to all contributors and collaborators for their support and efforts in making this work possible. 🚀 📌 Link to the paper: [https://lnkd.in/gZeYUxKz] #PTEP #PhysicsResearch #HadronPhysics #TMDs #QCD #ParticlePhysics

𝐏𝐡𝐃 𝐬𝐭𝐮𝐝𝐞𝐧𝐭 𝐃𝐚𝐧𝐢𝐞𝐥 𝐀𝐡𝐥𝐢𝐧 𝐇𝐞𝐢𝐤𝐤𝐢𝐧𝐞𝐧 𝐰𝐢𝐧𝐬 𝐭𝐡𝐞 𝐬𝐞𝐜𝐨𝐧𝐝 𝐩𝐥𝐚𝐜𝐞 𝐢𝐧 𝐭𝐡𝐞 𝐏𝐡𝐃 𝐏𝐨𝐬𝐭𝐞𝐫 𝐂𝐨𝐦𝐩𝐞𝐭𝐢𝐭𝐢𝐨𝐧 𝐚𝐭 𝐭𝐡𝐞 33𝐫𝐝 𝐒𝐲𝐦𝐩𝐨𝐬𝐢𝐮𝐦 𝐨𝐧 𝐅𝐮𝐬𝐢𝐨𝐧 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐲, 𝐈𝐫𝐞𝐥𝐚𝐧𝐝.   👏A big congratulations to Daniel Ahlin Heikkinen for winning the second place in the poster competition for presenting his PhD project on the behavior of tungsten fiber-reinforced tungsten composite materials at high temperatures.   “My research focuses on the behavior of tungsten fiber-reinforced tungsten composite materials at high temperatures and their potential application in future fusion reactors. I am conducting high-temperature annealing on the composite material, followed by post-annealing microstructural investigations, to assess its thermal stability. Ultimately, I aim to connect the microstructural evolution to the mechanical behavior of the material.” – Daniel Ahlin Heikkinen   His project is carried out within the framework of the EUROfusion consortium and the EuroTech Universities Alliance. He collaborates with the Max Planck Institute for Plasma Physics in Garching and the Technical University of Munich with the objective of optimizing tungsten fiber-reinforced tungsten composites in terms of their stability and extending their lifespan.   The 33rd Symposium on Fusion Technology, Dublin City University, Ireland was held on 22-27 September 2024 and is a major international symposium with 98 lectures and 711 posters. Read more about Daniel's research here: https://lnkd.in/d6HbxJSb #poster #prize #symposium #tungsten #composites #DTUdk

👏👏👏 The CESQ is very proud to announce that Johannes Schachenmayer was granted the European Research Council (ERC) Consolidator Grant #ERCCoG for his project MATHLOCCA: Many-body Theory of Local Chemistry in Cavities. The project will develop a quantum optics theory to uncover new emergent #quantum many-body physics in minimal molecular models with coupled electronic, nuclear, and photonic degrees of freedom. The theory approach is based on the #physics of cavity-modified dark states, and takes strong quantum correlations into account, which may play a decisive role in our understanding of cavity-modified #chemistry. Gaining a detailed understanding will open up possibilities of systematically using cavity fields as new types of “catalysts” and will also introduce new numerical theories for general open quantum many-body simulations. Johannes has joined the CESQ in 2016 as CNRS Chargé de Recherche where he is currently leading research on computational quantum many-body theory. He is also co-founder of the start-up company QPerfect. Congratulations Johannes! CNRS | University of Strasbourg | Institute of Supramolecular Science and Engineering - ISIS | European Center for Quantum Sciences aQCess platform

[LE STUDIUM Conference] We are glad to announce that the programme for the 13th International Symposium on Crystallization in Glasses and Liquids is now available online. 👉 4 days of conference on : •   Fundamental approaches to nucleation and crystal growth in glasses and liquids (interaction between theory, modelling and experiment) - Simulations, modelling, theory, contribution of artificial intelligence •   Developments and novel nucleation/crystallization processes (spray melting, photo-, laser-induced crystallization, sol-gel, magnetic field induced nucleation) - Crystallisation phenomena in natural glasses/melts and amorphous materials (polymers, sol-gel, metallic glasses, thin films) •   Relationships between glass structure and nucleation - Liquid phase separation, heterogeneities - Role of nucleating agents 📅 24-27 September 2024 📍 Hôtel Dupanloup - Orléans - FR 📣 Programme: https://urlr.me/NfyBF 📣 Registration: https://urlr.me/CvXJd Région Centre-Val de Loire Orléans Métropole ICG - International Commission on Glass CNRS - Centre national de la recherche scientifique CEMHTI - UPR3079 CNRS ARD MATEX