Abhijeet Kumar’s Post

What can one learn from torturing a 2D Semiconductor?🤔 The photons with zero momentum can only initialize direct bandgap transitions, hence, the conventional spectroscopy often ignores the rest of the band structure. Most excitons residing in other parts of the band structure remain 😶🌫️ invisible (dark) despite their significant technological importance. We realized that one can study dark excitons by stretching these crystals. In our latest research published in Nature Communications 📝, we've developed a straining technique to "fingerprint" and "brighten" these elusive species. We show that mechanical stretching: ✔️Drastically changes the band structure ✔️Transforms the energy hierarchy of excitons ✔️ Tunes the brightness of excitons. Using these insights, we discovered dark excitons from different points in the momentum space of WSe₂ and WS₂ monolayers, controlled their coupling and hybridization, and achieved large energy tuning of localized quantum emitters. You can read more about our work here: 🔗 https://lnkd.in/egj_Exq4 Looking ahead: We are excited to explore the potential of our technique to break the symmetry of excitons, manipulate valley dynamics, and engineer exciton transport. The future seems bright as we continue tuning the "strain knob". Thank you, Abhijeet Kumar, for being an equal partner in the journey. Especial shoutout to our collaborators Roberto Rosati, Joakim Hagel, Ermin Malic, Christoph Schattauer, Sarah Tobisch, and Florian Libisch for their theory calculations; @Pablo H. López and Sebastian Heeg for optimizing the straining technique; Douglas James Bock, Bianca Höfer, Jan Niklas Kirchhof, Kenneth Burfeindt for their assistance; Cornelius Gahl and Kirill Bolotin for supervision. #Semiconductors #2D #Research #Strain #TMDs #Excitons #Photonics

Today our newsletter is all about #quantum, starting with a look at the bright future of #QuantumSensing. In addition, PI (Physik Instrumente) Group writes about nanopositioning automation for the quantum era and IDEX Health & Science, LLC explains how to unlock the power of #QuantumComputing with advanced optical filters. In addition, Zygo provided tips on glass compensated objectives for surface inspection through a window, Alluxa, Inc writes about CHA and how it impacts optical filter spectra, and Iridian Spectral Technologies talks about emerging applications of optical filters. https://lnkd.in/egJaEMHC

Qubit analog with polariton superfluid in an annular trap Science Advances https://lnkd.in/gDt2-aJm

Analysis of heterostructures for spintronics shows how two desired quantum-physical effects reinforce each other https://lnkd.in/evSmQxvZ

In what ways are #superconducting magnets critical for the development of strong magnetic fields in #MRIsystems and #quantumcomputers? The burgeoning demand for advanced #MRIsystems in medical imaging fuels a growing need for superconducting magnets, pivotal in generating robust magnetic fields. Concurrently, #quantumcomputing strides forward, elevating the market, with superconducting materials essential for quantum computer enhancement. This synergy propels innovations at the intersection of #medicaldiagnostics and #computingtechnologies, fostering a transformative era in healthcare and computational sciences. Key Market Players: LS Cable & System., Sumitomo Electric , Hyper Tech Research Inc.., Cryomagnetics, Inc.., Fujikura Ltd., Bruker, Hitachi., Furukawa Electric LatAm Explore the market overview: https://lnkd.in/dNtjigdc #AMR #SuperconductingInnovations #MRIAdvancements #QuantumComputingImpact #MedicalImagingTechnology #SuperconductorsInHealthcare #InnovationsInMRI #QuantumComputingMaterials #MagneticFieldsInnovation #HealthTechRevolution #FutureOfMedicalTechnology

A study published in Nature Communications presents an innovative on-chip metasurface design that enhances guided wave radiation, surpassing traditional grating couplers. By employing a supercell design based on detour phase and geometric phase, researchers achieved full-parametric modulation of the Jones matrix, enabling four independent amplitude-phase channels through a single metasurface. Additionally, joint modulation of detour, geometric, and propagation phases allows for direction multiplexing by decoupling the Jones matrix from forward- and backward-propagating waves. This advancement could significantly impact optical communications, displays, and AR/VR technologies. Read the full article here: https://lnkd.in/gh-crPiq Citation: Ji, J., Li, J., Wang, Z. et al. On-chip multifunctional metasurfaces with full-parametric multiplexed Jones matrix. Nat Commun 15, 8271 (2024). https://lnkd.in/g-YkNicH

### The Cutting-Edge Field of Terahertz Technology Terahertz technology, utilizing the electromagnetic spectrum between microwaves and infrared light, is opening new frontiers in imaging, communication, and spectroscopy. This field explores the unique properties of terahertz waves, which can penetrate materials like clothing, paper, and plastic without the harmful effects of X-rays. Recent advancements include the development of terahertz imaging systems for security screening and medical diagnostics, as well as high-speed terahertz communication networks that could surpass current wireless technologies. Terahertz spectroscopy is also being used to analyze chemical compositions and material properties at a molecular level. This technology holds significant promise for applications across various industries, from healthcare to telecommunications. #TerahertzTechnology #AdvancedImaging #FutureCommunication

Researchers have demonstrated a groundbreaking non-volatile photonic-electronic memory based on a 3D monolithic integrated ferroelectric-silicon ring resonator. This memory can be programmed and erased using both electrical and optical methods, bridging the interface between electronic and photonic circuits. The device shows a high optical extinction ratio of 6.6 dB at a low working voltage of 5V and an endurance of 40,000 cycles. This innovation could enable future hybrid electronic-photonic systems for applications in photonic interconnects, high-speed data communication, and neuromorphic computing. https://lnkd.in/giJWgsw6 #Photonics #IntegratedCircuits Figure 1 from Zhang, G., Chen, Y., Zheng, Z. et al. Thin film ferroelectric photonic-electronic memory. Light Sci Appl 13, 206 (2024). https://lnkd.in/gs5Tyzu2

Skyrmions are magnetic nanobubbles and can move at a speed of 900 m/sec with electrical current.These nanobubbles offer enhanced information processing possibilities in electronic devices, expected to be the next bits on computer memory. They have great computing and information storage capacity and low energy consumption due to their small size. These results, which have been published in Science, offer new prospects for the development of more efficient and less energy intensive computing devices. #nanotechnology #nanomagnet #topological #quantum #quantumbit #quantuminformation #semiconductor #semiconductordevice #magneticmemory

Glad to be part of this collaborative effort! The work demonstrates the ferroelectric properties of the HZO films and monolithic integration into back-end-of-the-line (BEOL) 2D-FeFET device architectures with WSe2. https://lnkd.in/dMm3FM_t #neuromorphic #AI