TDA Research’s Post

📢 Check out our latest published article in the Open Journal of IEEE Signal Processing Society. It is about Spectral Estimation and evaluates different parameters involved in the implementation of direct sampling FFT-based measuring receivers. It might be of interest if you... ✔ ... want to know more about the processing behind time-domain emissions measurement. ✔ ...need guidance for selecting and adjusting spectral estimation parameters for your own FFT-based measuring receiver implementation using scopes. ✔ ...are interested in quantifying the numerical errors in the calculated spectrum due to particular windowing, overlapping and interpolation factors. 👉 The paper is #OpenAccess and available in the IEEE Xplore (Early Access) and at our Zenodom GmbH community (https://lnkd.in/dCnDHhyJ) 🌐. This work is part of the EMC-STD project from EURAMET - The European Association of National Metrology Institutes Metrology Partnership. 💯 #EMC #EMI #IEEE #CISPR #Metrology #EMCBarcelona

#OnTheBeamlines: Loop current order is an idea or concept thought to explain a special way that particles arrange themselves in a material at the quantum level. Researchers believe the concept could help explain unusual behaviours that occur in some materials – in particular high-temperature superconductors. While the idea has been around since the 1990s, no one has definitively demonstrated that it actually exists. Researchers from the Massachusetts Institute of Technology (MIT) used a technique called spin-resolved angle-resolved photoemission spectroscopy (SR-ARPES) at our QMSC beamline to collect evidence that loop current order exists. “Experimental confirmation of the loop current order in condensed matter systems is of great academic significance as it has been a long-standing enigma in this field,” says Dongjin Oh (in photo), a member of the Comin Photon Scattering Lab at MIT. “Direct observation of it would be a milestone in understanding various exotic quantum phases appearing in condensed matter.” Deepening our understanding of quantum materials, he says, will make it possible to leverage their electronic and magnetic properties in next-generation technologies. #QuantumMaterials #LoopCurrentOrder #Superconductors

#OnTheBeamlines: Loop current order is an idea or concept thought to explain a special way that particles arrange themselves in a material at the quantum level. Researchers believe the concept could help explain unusual behaviours that occur in some materials – in particular high-temperature superconductors. While the idea has been around since the 1990s, no one has definitively demonstrated that it actually exists. Researchers from the Massachusetts Institute of Technology (MIT) used a technique called spin-resolved angle-resolved photoemission spectroscopy (SR-ARPES) at our QMSC beamline to collect evidence that loop current order exists. “Experimental confirmation of the loop current order in condensed matter systems is of great academic significance as it has been a long-standing enigma in this field,” says Dongjin Oh (in photo), a member of the Comin Photon Scattering Lab at MIT. “Direct observation of it would be a milestone in understanding various exotic quantum phases appearing in condensed matter.” Deepening our understanding of quantum materials, he says, will make it possible to leverage their electronic and magnetic properties in next-generation technologies. #QuantumMaterials #LoopCurrentOrder #Superconductors

I FIND MUCH BEAUTY IN SCIENCE. Even a deeper beauty by gaining knowledge over the years. About what the components do, what the system aims to do, and what are the applications. There is little appreciation for the massive amount of work and development that are needed to reach such levels. ``Higher``, as TEMS would sing (https://lnkd.in/eNFubuc6) There is this misconception that scientific discovery is a matter of luck, or a one-man show, as reflected in the Nobel prize for example. The truth is, each one of us is ``standing on the shoulders of giants``, inching ever so slowly towards progression. My wish is to propagate accurately what science really is, and move away from the stereotypes that STEM*** from a lack of proper knowledge. P.S.: As I was writing, I realized that I was generating a ``double entendre`` (incidentally, this wording does not even exist in French), with STEM. I threw in the stars to remember: *** STEM Science Technology Engineering Mathematics (and I have just noticed that "TEMS" is a derivative of "STEM": Coincidence?) #stem

📢 Our latest paper  "THz Quantum Well Photodetector based on LO-phonon scattering-assisted extraction" has been finally published! Some key takeaways: 1. **Challenges in THz Photodetection**: THz photon energies are extremely small, posing challenges in directly applying strategies from the mid-infrared range to THz photodetection. 2. **Approach**: We introduce an intersubband THz photodetector inspired by a Quantum Cascade Detector  but tailored to operate under bias. 3. **Effective Extraction Mechanism**: Our device's band structure is carefully designed to absorb photons at 15 meV (3.5 THz). By applying a bias, we establish a rapid extraction pathway for photo-excited electrons, facilitated by an LO phonon transition (36 meV) even though this transition exceeds the energy of the photons to be detected. 4. **Significant Dark Current**: The design inherently yields a substantial dark current, driven by the necessity to bias the devices. 5. **Metamaterial Solution**: To mitigate the high dark current, we employ a patch antenna metamaterial, effectively impacting on device performance. 6. **Simplified Epitaxial Growth**: Our design allows for the utilization of standard Al fractions, streamlining the epitaxial growth process and enabling the full utilization of quantum engineering of electronic states. Feel free to reach out for more details.

Check out our latest preprint https://lnkd.in/eDuZwzTG - observation of Bose-Einstein condensation of dipolar ground state molecules. We evaporatively cool a gas of NaCs molecules from 700 nK to 6 nK above absolute zero. At this point the molecular gas forms a Bose-Einstein condensate, the coldest molecular gas to date. The lifetime of the BEC is ~2 sec. This becomes possible with an enhanced collisional shielding method that suppresses loss rates by 4 orders of magnitude. We could not be more excited exploring this new quantum liquid... Thanks so much to the entire NaCs team for the amazing work, Niccolò Bigagli, Weijun YUAN, Siwei Zhang, Boris Bulatovic, Tijs Karman, and Ian Stevenson -- and former lab members Aden Lam and Claire Warner!! Columbia University Columbia Quantum Initiative

Excited to share our latest publication in ACS Nano: "High-Efficiency Coupling of Free Electrons to Sub-λ³ Modal Volume, High-Q Photonic Cavities." This collaborative effort within Paris-Saclay features Malo Bézard, Yves Auad, Luiz Tizei, Mathieu Kociak and Luigi Ruggierio from Laboratoire de Physique des Solides (LPS), Imene SI HADJ MOHAND, Arthur Le Roux, Paul Baroux, and Xavier Checoury from C2N - Centre de Nanosciences et de Nanotechnologies. The research explores high-quality-factor cavities with modal volumes smaller than λ³ using spatially resolved monochromated electron energy loss spectroscopy (EELS). Key findings include: High coupling of electrons to quasi-transverse electrical modes. Detailed study of cavities using advanced microscopy. Identification of modes and dielectric slot mode energies. This work paves the way for applications in quantum nano-optics. Read more: https://lnkd.in/e44X7NZg

#OnTheBeamlines: Loop current order is an idea or concept thought to explain a special way that particles arrange themselves in a material at the quantum level. Researchers believe the concept could help explain unusual behaviours that occur in some materials – in particular high-temperature superconductors. While the idea has been around since the 1990s, no one has definitively demonstrated that it actually exists. Researchers from the Massachusetts Institute of Technology (MIT) used a technique called spin-resolved angle-resolved photoemission spectroscopy (SR-ARPES) at our QMSC beamline to collect evidence that loop current order exists. “Experimental confirmation of the loop current order in condensed matter systems is of great academic significance as it has been a long-standing enigma in this field,” says Dongjin Oh (in photo), a member of the Comin Photon Scattering Lab at MIT. “Direct observation of it would be a milestone in understanding various exotic quantum phases appearing in condensed matter.” Deepening our understanding of quantum materials, he says, will make it possible to leverage their electronic and magnetic properties in next-generation technologies. #QuantumMaterials #LoopCurrentOrder #Superconductors

#OnTheBeamlines: Loop current order is an idea or concept thought to explain a special way that particles arrange themselves in a material at the quantum level. Researchers believe the concept could help explain unusual behaviours that occur in some materials – in particular high-temperature superconductors. While the idea has been around since the 1990s, no one has definitively demonstrated that it actually exists. Researchers from the Massachusetts Institute of Technology (MIT) used a technique called spin-resolved angle-resolved photoemission spectroscopy (SR-ARPES) at our QMSC beamline to collect evidence that loop current order exists. “Experimental confirmation of the loop current order in condensed matter systems is of great academic significance as it has been a long-standing enigma in this field,” says Dongjin Oh (in photo), a member of the Comin Photon Scattering Lab at MIT. “Direct observation of it would be a milestone in understanding various exotic quantum phases appearing in condensed matter.” Deepening our understanding of quantum materials, he says, will make it possible to leverage their electronic and magnetic properties in next-generation technologies. #QuantumMaterials #LoopCurrentOrder #Superconductors

📃Scientific paper: Cyclotron line formation in the radiative shock of an accreting magnetized neutron star Abstract: Magnetic neutron stars (NSs) often exhibit a cyclotron resonant scattering feature (CRSF) in their X-ray spectra, but the site of the CRSF formation is still an open puzzle. A promising candidate for high-luminosity sources has always been the radiative shock (RS) in the accretion column. Yet, no quantitative calculations of spectral formation at the RS have been performed so far. Here we explore the scenario where the shock is the site of the CRSF formation. We study spectral formation at the RS and the emergent spectral shape across a wide range of the parameter space. We developed a Monte Carlo code to conduct radiation transfer simulations at the RS, adopting a fully relativistic scheme for the interaction between radiation and electrons. We properly treated bulk-motion Comptonization in the pre-shock region, thermal Comptonization in the post-shock region, and resonant Compton scattering in both regions. We calculated the angle- and energy-dependent emergent X-ray spectrum from the RS, focusing on both the CRSF and the X-ray continuum, under diverse conditions. We find that a power law, hard X-ray continuum and a CRSF are naturally produced by the first-order Fermi energization as the photons criss-cross the shock. The CRSF shape depends mainly on the transverse optical depth and the post-shock temperature. We show that the CRSF energy centroid is shifted by ~(20-30)% to lower energies compared to the classical cyclotron energy, due to the Doppler boosting be... Continued on ES/IODE ➡️ https://etcse.fr/DtwPe ------- If you find this interesting, feel free to follow, comment and share. We need your help to enhance our visibility, so that our platform continues to serve you.