SALD BV’s Post

Would you have stopped at this poster? 🧐 This week I had the opportunity to present our recently published results on “Laser-induced modification of an excited-state vibrational wave packet in neutral H2 observed in a pump-control scheme“, Phys. Rev. Research 6, 033326, https://lnkd.in/gssxrimJ, at the Ultrafast Dynamic Imaging of Matter conference 2024, held at DESY in Hamburg, Germany (https://lnkd.in/gvgJ7Ua4). My “experimental puzzle” poster on “Imaging and control of ultrafast dynamics of correlated two-electron atomic and molecular systems” managed to provoke a lot of interest and win the FELs of Europe poster prize awarded at the conference (https://lnkd.in/gUESjAXZ ). As much as it was an experience to handle the poster in this format that I wanted to try out for quite some time, I am mostly glad for the many inspiring discussions I had around the poster about our already published XUV time-delay absorption work as well as the new results on ionization out of FEL-prepared states in Helium. This was a combination of topics in the spirit of the conference focusing on new techniques for imaging the dynamics of matter on #ultrafast timescales, from #femtoseconds to #attoseconds.

In collaboration with the Paul Scherrer Institute, the University of Cambridge and others, we've published a new paper in Physical Review Accelerators and Beams, reporting experimental results of a YBCO bulk superconducting undulator magnetic optimisation. The magnetic field optimisation of RE-Ba-Cu-O (REBCO, RE=rare earth) bulk superconducting undulators is a fundamental step toward their implementation in an accelerator driven photon source, like a synchrotron or a free electron laser. We propose a sorting algorithm to reduce the undulator’s phase error based on the reconstruction of the trapped current inside the bulks of a staggered array undulator. The results obtained with a YBCO short prototype field-cooled down to 10 K in a 10 T magnetic field are reported, which suggest a potential improvement in the homogeneity of the on-axis undulator field of a full scale prototype by more than an order of magnitude. The paper can be downloaded, open access, here: https://lnkd.in/eYFN_C2E

Save the date for our next webinar!

When solving ordinary differential equations numerically, we usually aim for the biggest stable step size, as this leads to faster simulations when aiming to cover a set domain. However, this might lead to some non-physical results. This was the main idea behind the work presented in the 14th ERCOFTAC Workshop on Direct and Large Eddy Simulation (#DLES14) held on FAU Erlangen-Nürnberg, related to the research done in CTTC - UPC | Universitat Politècnica de Catalunya - Centre Tecnològic de Transferència de Calor. After finding some non-physical spurious modes when pushing the timestep close to the stability limit in the simulation of a turbulent planar channel flow, we delved deep in the stability of Runge-Kutta schemes, and how this affects the outcome of the integration.

Electron beam-induced carbon deposition irritatingly occurs in large areas of otherwise pristine graphene, even with sparsely absorbed hydrocarbons. Intentional adsorption of another ubiquitous molecule species, which alters the chemistry towards volatile products, turns out to be an effective, robust and simple way to achieve ultraclean graphene under a focused beam. Learn more about how IAMM researchers Hao Wang, Milinda Randeniya, Austin Houston, Gerd Duscher and Gong Gu, made graphene ultraclean and solved a long-standing problem! ➡ https://lnkd.in/ecGHDZ3M

We are at the precipice of a quantum revolution enabled by quantum materials and quantum technologies. Historically, quantum materials and quantum technologies have developed independently. While quantum materials evolved out of modern chemistry and the ability to fashion materials with unprecedented atomic precision, quantum technologies share lineage with optics and the ability to manipulate quanta of light. A marriage between these two fields is expected to hold the key to a quantum future. At Harvard, in the laboratories of Philip Kim and Amir Yacoby, we are taking the first steps toward realizing this vision. For starters, we show that microwave reflectometry, a standard technique to measure qubits, can be adapted to extract thermodynamic properties of atomically thin 2D materials. Thermodynamic measurements are otherwise notoriously challenging in such systems because of their small sample volume. Come find out more about our research this APS March meeting:  Superfluid stiffness measurements in twisted graphene:(https://lnkd.in/ehze9A3q, https://lnkd.in/eDC-Pqxi)  Complex conductivity measurements in monolayer WTe2:(https://lnkd.in/eD25y3vj) Quantum geometry and quantum capacitance in graphene quantum Hall insulators (https://lnkd.in/eZnSAT44) 

New paper from Nan Jiang's lab at UIC is featured on the cover of ACS Nano! "Chemically Interrogating N-Heterocyclic Carbenes at the Single-Molecule Level Using Tip-Enhanced Raman Spectroscopy" Read it here: t.co/pLEXMqF6mm

We're thrilled to share a recent publication by the group of Prof. Christoph Lienau in Oldenburg, who have made progress in understanding charge transfer dynamics in diaminoterephthalate-C60 dyads. Their research revealed that structural flexibility in these dyads slows down the charge transfer process. The study focuses on electron-donor–acceptor (D–A) dyads, model systems for solar cell applications and mimicking natural reaction centers. Preliminary TD-DFT simulations predicted ultrafast charge separation dynamics, highlighting the need for time-resolved experimental studies. Using a PicoQuant TCSPC module ⏱, they conducted precise time- and spectrally resolved photoluminescence measurements. These showed that the observed triplet state absorption is not a result of the charge separation process but is caused by direct optical excitation of the fullerene moiety. ➡ Dive deeper into the research: https://lnkd.in/gjpPPeie Interested in performing similar experiments to study fast processes with high time resolution? Check out our new ⏱ PicoHarp 330 TCSPC module, featuring: - Cutting-edge time resolution of 1 ps - Outstanding timing precision of 2 ps RMS for single channel and 3 ps RMS between channels ➡ https://lnkd.in/dY39RKG7

More visualisations from our ongoing exploration of black holes: in this case, we rendered the plasma density around a black hole using data from MHD simulations processed by the BHAC tool. The initial plasma configuration is shaped as a Fishbone & Moncrief torus, and the colour of particles determines the plasma density. In order to read the snapshots generated by the simulation through AMRVAC (Adaptive Mesh Refinement - Versatile Advection Code, a specific code was written to load the values and density distribution in real-time into the particle system displayed. BHAC credits: Created by Oliver Porth and the development team Hector Olivares, Bart Ripperda, Fabio Bacchini, Yosuke Mizuno, Ziri Younsi, Luciano Rezzolla, Elias Most and Lukas Weih, at Goethe University Frankfurt within the ERC Synergy grant “BlackHoleCam: Imaging the Event Horizon of Black Holes” (Grant No. 610058), PI: H. Falcke, M. Kramer, L. Rezzolla.

There’s a new paper from the clock team at Strathclyde and our friends at University of Neuchâtel in Scientific Reports. The big picture synopsis is that we’ve been able to scale all the atomics gubbins required for a cold-atom microwave atomic clock down to the size of an espresso cup. This involved combining a nanofabricated gMOT grating with a 3D-printed microwave cavity to let us make clouds of ultracold atoms inside the cavity. These first results show that the system works and that there is a path to main an extremely compact laser-cooled atomic clock that would demonstrate high performance in a small package. The goal now is to investigate the stability and accuracy of the system, with an ambition to look at instabilities on the 15th digit, which is on the scale of a nanosecond over a week. The paper is open access and available to read -> https://lnkd.in/grdt5NP7