C.J. Reddy

Kagome metal KV₃Sb₅ KV₃ Sb₅ is a fascinating quantum material that has attracted enormous attention due to its interplay of topology, strong correlations, charge ordering, and chirality. It is a layered material where V atoms form a kagome lattice (a 2D network of corner-sharing triangles), interleaved with K and Sb. Its electronic properties are also very fascinating: It features Dirac cones, van Hove singularities, Flat bands, a charge density wave (CDW) below ~78 K, and superconductivity below ~1 K. Although the material is nonmagnetic, a spontaneous anomalous Hall effect (AHE) was observed, indicating time-reversal symmetry (TRS) breaking which is unexpected in a non-magnetic metal. This signals hidden chiral order in the charge or orbital degrees of freedom. In fact, at low temperatures, KV₃Sb₅ enters a CDW phase. But it's not a simple- it breaks inversion symmetry and is believed to be chiral, i.e. that the charge order forms a loop current pattern. Furthermore, the CDW can exist in configurations spontaneously breaking mirror symmetry. Theoretical models propose loop currents in the kagome planes(circulating electronic currents on V₃ triangular plaquettes.)These patterns break both inversion symmetry (IS) and time-reversal symmetry (TRS) producing a chiral CDW without magnetic moments. The orbital-selective currents give rise to AHE, despite the absence of net magnetization. Optical Kerr rotation and second-harmonic generation confirm broken time-reversal or inversion symmetry. Scanning tunneling microscopy (STM) shows bond order modulation with asymmetric (rotational) features: It shows bond-centered CDW modulations with broken C₆ rotational symmetry. It also reveals domains with clockwise or counterclockwise bond patterns. Kerr rotation angle (rotation of polarization of reflected light) indicates broken TRS and chirality. Nonzero Kerr signal appears well above the superconducting transition, linked to CDW onset. The persistence of AHE without magnetic order strongly suggesting orbital currents and chiral electronic order.The chiral CDW can couple to topological bands, potentially enabling chiral superconductivity, unconventional pairing states, and Majorana edge modes in vortex cores. There's ongoing research on whether the chirality survives into the superconducting phase, possibly leading to time-reversal breaking superconductivity. Reference: M Zahid Hasan et al., Nat Mater. Oct;20(10):1353 2021.Caption:The KV3Sb5 prototype structure (a) crystallizes in the P6/mmm space group, featuring a layered structure of V-Sb sheets intercalated by K. The vanadium sublattice forms a structurally perfect Kagome lattice. Two distinct Sb sublattices exist. The Sb1 sublattice forms a simple hexagonal net centered on each Kagome hexagon, while the Sb2 sublattice creates a graphene-like Sb sheet above and below each Kagome layer. Atomic resolution TEM (b) partially decouples the Sb sublattices (orange) from the K-V (red and purple) sublattices.

2

I have conducted advanced research on enhancing the performance of MoS2/graphene-based field-effect transistors (FETs) for next-generation electronic applications. By doping APTES passivation and doping techniques, we successfully increased the mobility of MoS2 from 103 to 135 cm²/Vs and reduced the threshold voltage, enhancing device stability and performance. Our findings demonstrate that APTES prevents electron trapping and serves as an effective n-type dopant, making it a promising candidate for neuromorphic computing and high-performance logic applications. This research highlights the potential of vertical heterostructures and graphene electrodes in achieving reliable, low-power, and efficient devices for the future of electronics.

5

🚀📡 Excited to Share Our Latest Research Milestone! 📡🚀 Our paper titled "Optimised Printed Antenna for Aerospace IoT Wireless Connectivity" has been officially published by Springer in the eBook Data Processing and Networking (First Online: 📅 July 5, 2025). This work highlights innovative antenna designs for enhancing IoT-based aerospace wireless communication-paving the way for smarter, more efficient connectivity solutions ✈️📶. 👨‍💻 Authors: Jay Jivani, Sidharth Sharma, Dr. Manish Varun Yadav, Dr Swati Varun Yadav, Dr. Dinesh Yadav, Dr. Tanweer Ali 🌐 Now accessible worldwide via Springer Nature Link! 🙏 Grateful to my co-authors, mentors, and supporters for their valuable contributions throughout this journey. #Springer #Research #Publication #Aerospace #IoT #Wireless #Connectivity #Antennas #Innovation #Manipal #MITMAHE #Engineering #Technology, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal University Jaipur, Director MIT, Manipal

52

2 Comments

Alhamdulillah, another journal article has been published in IEEE Sensors Council Journal. Here we have developed a #laser-based processing technique to improve the #response #speed of #flexible #MEMS #thermal #sensors. Flexible sensors typically suffer from slow thermal response due to excess thermal mass, and conventional thinning methods often compromise handling and integration. Our #localized backside laser ablation approach selectively removes substrate material only beneath the sensing area, preserving the overall device structure. Using pulsed UV laser processing on a polyimide film sensor, we achieved a significant improvement in time response while maintaining mechanical stability. Airflow experiments, including dynamic flow conditions, successfully demonstrated the effectiveness of this technique for high-speed flexible sensing applications. https://lnkd.in/gmBfpZSq 論文1報掲載されました。本研究では、フレキシブルMEMS熱式センサの応答速度を向上させる裏面レーザ加工技術を開発しました。センシング素子領域の裏面を局所的に除去することで、構造の安定性を保ちながら熱容量を低減しました。ポリイミド基板上のセンサで大幅な応答高速化を確認し、高周波往復気流の安定した計測に成功しました。 Hiroshima City University

10

1 Comment

Pleased to share that our paper has been published in the Wiley International Journal of Circuit Theory and Applications: “Comparative Analysis of Modulation Shapes on Laser Diode Performance With a High‐Efficiency LLC Resonant Converter Driver” Access link: https://lnkd.in/drbpuM54 Many thanks to my co-authors Ali Rıfat Boynueğri and HAYRİ YİĞİT for their valuable contributions and efforts throughout this work. #AGÜ #YTÜ #Wiley #PowerElectronics #ResonantConverters

99

📽️ December TCAS-I Highlight Video Now Available Watch the latest IEEE Transactions on Circuits and Systems I (TCAS-I) December highlight video featuring the paper “Weak Nonlinearities in Active Filters and Continuous-Time Pipeline ADCs.” Authored by: Chaitanya Kumar and Shanthi Pavan Paper overview: Traditional ADCs rely on a stand-alone analog anti-aliasing filter to suppress out-of-band signals prior to sampling. While essential, this filter can be power-hungry and is often a major source of distortion. Continuous-time pipeline (CTP) ADCs integrate the anti-aliasing function directly into the conversion process, effectively replacing the filter–ADC cascade with a single unified system. This architectural shift raises an important question regarding the impact of practical amplifier imperfections on linearity. In this paper, we analyze the effect of weak amplifier nonlinearities and demonstrate that an appropriately designed CTP can achieve inherently superior linearity compared to an equivalent traditional solution operating under identical noise and power constraints. 🎬 Watch the highlight video to learn how integrated anti-aliasing in CTP ADCs influences linearity under real-world conditions. Access the paper here: https://loom.ly/VcuOwB4 #IEEE #CASS #TCASI #AnalogDesign #ADCs #SignalProcessing #IntegratedCircuits

51

  Attending workshops on advanced titles is the need of hour for every faculty member of the engineering field. Millimeter Wave (mmWave) and Terahertz (THz) technologies are part of the electromagnetic spectrum that lies between microwave and infrared frequencies. I have actively attended the workshop titled "Millimeter Wave and THz Technology and Their Contemporary Applications," organized by Jaypee Institute of Information Technology in collaboration with the IEEE chapter and Jyoti Electronics from 14 Jul 2025 to 18 Jul 2025. The workshop was well-organized to highlight the various fields, like exposure to cutting-edge technologies, curriculum development and enrichment, research and interdisciplinary collaboration, industry readiness, and funding proposals. A big thank you to the organizing members of Jaypee Institute of Information Technology, the esteemed speakers, and fellow participants for such an enriching learning experience. Looking forward to applying these concepts in future research and innovations!

19

Interesting use of AI/ML for microwave circuit design! Will need a fast EM Solver to determine the S-parameters of the circuit. Look forward to how AI/ML can be applied to non-linear designs like Power Amplifiers

16

1 Comment

🎯 Understanding FIR Filters Made Simple! FIR (Finite Impulse Response) filters are one of the most important building blocks in Digital Signal Processing (DSP). They are widely used because they offer: ✅ Stability ✅ Linear phase response ✅ Predictable performance ✅ Easy implementation in digital systems 📘 In this infographic, I’ve explained: 🔹 What an FIR filter is 🔹 How it works 🔹 Different FIR filter types 🔹 FIR vs IIR comparison 🔹 Real-world applications in audio, communication, radar, and biomedical systems 💡 Think of an FIR filter like a weighted moving average that smooths and shapes signals intelligently. From smartphones 🎵 to medical devices ❤️ and wireless communication 📡, FIR filters are everywhere. Hope this visual guide helps students, engineers, and DSP enthusiasts understand FIR filters more intuitively! #DSP #FIRFilter #SignalProcessing #DigitalSignalProcessing #Electronics #Engineering #EmbeddedSystems #CommunicationSystems #AudioProcessing #Technology

4

New Publication! New Publication in IEEE Journal on Flexible Electronics (J-FLEX) Link: https://lnkd.in/gSBuG4Hd Title of paper: Optimizing Material Choices for Flexible Pressure Sensors Driven by Triboelectric Nanogenerators. Authors: Km Neeraj and Navneet Gupta EEE Department BITS Pilani - Pilani Campus Birla Institute of Technology and Science, Pilani #flexibleelectronics

116

9 Comments

🔋 Solving ZCS Issues in LLC Controllers – New Design Insights! https://zurl.co/5QRtq Struggling with Zero Current Switching (ZCS) issues during burst mode in your LLC resonant converters? Explore Texas Instruments' latest insights on preventing ZCS failures using the UCC256404 controller. 🚀 Key Takeaways: ✅ Understanding burst mode switching challenges ✅ External circuit designs for ZCS-free burst transitions ✅ Efficient auto-standby control circuits for improved performance ✅ Tested solutions ensuring energy-efficient operation across 90V to 264V AC inputs Optimize your TV and monitor power supplies (SMPS) with these expert recommendations and circuit improvements for high efficiency & reliability. #powerconversion #llccontroller #zcsprotection #powersupplydesign #texasinstruments #ucc256404 #resonantconverter #burstmodeoperation #efficientdesign #zcsissues #smpsdesign #standbypower #energyefficiency #circuitdesign #llctopology #electronicsengineering #hardwaredesign #designoptimization #powersystemengineering #powersupplysolutions

47

Early Access on IEEE Xplore “Dynamic Modeling and Physical Insights into Peltier Module Behavior Enabling a Foundation for Model-Based Control in Power Electronics” has been published in Early Access in IEEE Transactions on Industry Applications. 🔗 DOI: 10.1109/TIA.2025.3644991 📍 Journal: IEEE Transactions on Industry Applications In this work, we develop a physics-based, control-oriented dynamic model of a Peltier (thermoelectric) module that goes beyond conventional steady-state or lumped-circuit representations. Starting from fundamental thermoelectric and thermal energy balance equations, the study: • Derives a small-signal dynamic model linking thermoelectric physics directly to control-relevant parameters • Reduces the system to an interpretable second-order transfer function • Reveals how gain, poles, zeros, bandwidth, and phase margin evolve with operating current and temperature • Provides physical insight into electro–thermal coupling, Joule heating dominance, and robustness limits • Establishes a practical foundation for model-based control, gain scheduling, and robust design of thermoelectric systems The results are particularly relevant for power electronics, precision thermal management, heat pumps, energy conversion systems, and advanced control applications, where understanding dynamic behavior is critical. Looking forward to discussions, feedback, and potential collaborations in this area. #IEEE #EarlyAccess #Thermoelectric #Peltier #PowerElectronics #DynamicModeling #ControlSystems #HeatPumps #EnergySystems #ThermalManagement #Research #IISc

36

Around 20% of world's chip design engineers based in India, key to global semiconductor ecosystem: Report - The Economic Times https://lnkd.in/gdvraumA

3

A new book on 6G Communications networking and signal processing has just been published by Springer Nature. This volume 1437 in the Electrical Engineering Series contains full length articles of the SGCNSP 2025 conference presentations. Should be of interest to those working on networks and machine learning.

18

New Publication Alert I am delighted to share that my latest research article, "A Transformerless Bidirectional Active Switched Inductor-Based SEPIC High-Gain DC–DC Converter With Buck–Boost Capability," has been published in IEEE Access. The paper is now online: https://lnkd.in/gi2mWuzV

51

4 Comments

Conquering the complexities of high-resolution data converters! 🚀 Our IEEE CAS Magazine archive article from Vol. 23, Issue 3, "Challenges in Precision Continuous-Time Delta-Sigma Data Converter Design," dives into the hurdles of achieving over 16-bit resolution across wide bandwidths. ✍️ Authored by: Raviteja Theertham; Shanthi Pavan Discover the primary problems designers face, including feedback DAC linearity and flicker noise introduced by loop filters. This paper describes innovative techniques like the virtual-ground-switched resistor DAC and the zapped virtual-ground-switched dual return-to-open DAC, which are inherently more linear than prior-art solutions. Learn how chopping can eliminate flicker noise while minimizing artifacts. The article illustrates the efficacy of these techniques with example multi-bit and single-bit designs achieving over 100 dB SNDR over a 250 kHz bandwidth in 180 nm CMOS technology. A must-read for anyone pushing the boundaries of precision analog design! 🔗Check it out at the link in the comments. #IEEE #CASMAG #DataConverters #AnalogDesign #DeltaSigma #CMOS #HighResolution #ResearchArchive

1

1 Comment

Publication: IEEE Journal of Solid-State Circuits (JSSC) Article: A Blocker-Tolerant Receiver With VCO-Based Non-Uniform Multi-Level Time-Approximation Filter Authors: Ce Yang; Shiyu Su; Mostafa Ayesh; Soumya Mahapatra; Maysara Hamada; Vinay Chenna; Hossein Hashemi; Mike Shuo-Wei Chen EiC Note: This article presents a blocker-tolerant mm-Wave receiver that achieves spectral selectivity and high blocker rejection with low power and area overhead. The prototype chip consumes 87 mW in 28 nm CMOS and achieves −31 dB EVM with a 24-dBc blocker at 1.217-GHz offset from a 32-GHz LO. Read the full article on IEEE Xplore here: https://bit.ly/48bl4fP #IEEESSCS #JSSC #IEEE #SolidStateCircuits #RFIC #mmWave #BlockerTolerance #VCO #TimeApproximationFilter #SpectralSelectivity #AnalogDesign #WirelessInfrastructure #5G #6G #28nmCMOS #ICDesign #SemiconductorEngineering

108

⚡Mesoporous Silicon in Semiconductor industry⚡ As Moore’s Law slows and device complexity increases, the semiconductor industry is turning to innovative material platforms — and Mesoporous Silicon (MePSi) is emerging as a key player. 🔍 What Is Mesoporous Silicon? Mesoporous silicon is formed by electrochemical etching of crystalline silicon in hydrofluoric acid. This process creates uniform nanopores ranging from 2 to 50 nanometers. A material that is still “silicon” but behaves differently — with: →Massive surface-to-volume ratio →Controllable porosity and thickness →Biocompatibility and biodegradability →Enhanced light absorption and photonic behavior 🧪 Where It’s Useful 1. Photonic Crystals & Optical Devices Tunable refractive index improves light trapping, making it valuable for solar cells & photonic devices. 2. High-Energy Batteries Porous silicon anodes for faster ion diffusion and higher capacity – Up to 10x more than graphite. 3. Biomedical Applications Biodegradable implants Smart drug delivery platforms Ultra-sensitive biosensors 4. Thermal Insulation Low thermal conductivity enables improved thermal barriers 🔧 Impact on the industry ⚙️ 1. Functional Scaling Beyond Moore’s Law Instead of shrinking transistors, MePSi adds new capabilities — sensing, photonics, bio-interfacing — directly on silicon. It supports the shift from “smaller” to smarter, multifunctional chips. 🧩 2. Heterogeneous Integration Enables hybrid systems by combining logic, sensing, energy storage, and optics into one platform — perfect for lab-on-chip, AI edge devices, and wearables. 🏗️ 3. CMOS-Compatible Manufacturing MePSi can be fabricated using existing silicon processes, which means it’s ready for mass production and doesn’t require entirely new infrastructure. 🌱 4. Sustainable & Biodegradable Electronics Supports green tech goals: Reduces electronic waste Enables temporary medical implants Paves the way for eco-friendly sensors and devices 🔋 5. Energy & Photonics Revolution Improves performance in: Lithium-ion batteries (porous anodes) On-chip photonics Thermal management systems 💡 Whether in batteries, biosensors, or wearable devices — MePSi isn’t just passive material… it’s engineered functionality at the nanoscale. #MesoporousSilicon #SemiconductorInnovation #Wearables #FlexibleElectronics #Biosensors #SolarTech #Transistors #CMOSCompatible #AdvancedMaterials #FutureTech Image source : Helmholtz-Zentrum Berlin(HZB)

11