A5077672671- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- 2D Materials and Applications
- Graphene research and applications
- Vibrio bacteria research studies
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor materials and devices
- MXene and MAX Phase Materials
- Multiferroics and related materials
- Aquaculture disease management and microbiota
- Ferroelectric and Negative Capacitance Devices
- Nanowire Synthesis and Applications
- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Salmonella and Campylobacter epidemiology
- Ga2O3 and related materials
- Heusler alloys: electronic and magnetic properties
- Advanced Photocatalysis Techniques
- Perovskite Materials and Applications
- Advanced Memory and Neural Computing
- Transition Metal Oxide Nanomaterials
- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Enzyme Production and Characterization
- Peptidase Inhibition and Analysis
Indraprastha Institute of Information Technology Delhi
2022-2025
Morgan State University
2022
Jawaharlal Nehru University
2011-2022
Midnapore Homeopathic Medical College and Hospital
2021
Central Council for Research in Homoeopathy
2021
Government of West Bengal
2021
University of Notre Dame
2016-2019
Center for NanoScience
2019
Notre Dame of Dadiangas University
2019
Pennsylvania State University
2014-2015
Vertical integration of two-dimensional van der Waals materials is predicted to lead novel electronic and optical properties not found in the constituent layers. Here, we present direct synthesis two unique, atomically thin, multi-junction heterostructures by combining graphene with monolayer transition-metal dichalocogenides: MoS2, MoSe2, WSe2.The realization MoS2-WSe2-Graphene WSe2-MoSe2-Graphene leads toresonant tunneling an thin stack spectrally narrow room temperature negative...
Heterogeneous engineering of two-dimensional layered materials, including metallic graphene and semiconducting transition metal dichalcogenides, presents an exciting opportunity to produce highly tunable electronic optoelectronic systems. In order engineer pristine layers their interfaces, epitaxial growth such heterostructures is required. We report the direct crystalline, monolayer tungsten diselenide (WSe2) on (EG) grown from silicon carbide. Raman spectroscopy, photoluminescence,...
We investigate the gate controlled direct band-to-band tunneling (BTBT) current in monolayer transition-metal dichalcogenide (MX <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) channel-based tunnel field effect transistor (TFET). Five MX materials (MoS ,MoSe ,MoTe ,WS ,WSe their 2-D sheet forms are considered for this purpose. first study real and imaginary band structure of those by density-functional theory (DFT), which is then used...
Ultrathin two-dimensional (2D) ferromagnets with intrinsic half-metallicity are highly prospective in designing nanoscale spintronics devices. In this work, we systematically investigate the spin transport and dynamical properties of one such group promising 2D ferromagnets---monolayer iron dihalides (${\mathrm{FeX}}_{2}$, X = Cl, Br, I)---using density functional theory (DFT). First, explore these ${\mathrm{FeX}}_{2}$ monolayers by combining nonequilibrium Green's function (NEGF) technique...
We have shown that organic folded structures can be utilized to elicit piezo-, ferroelectric and efficient second harmonic generation – all within a single component, macroscopically dipole active system.
We demonstrate a novel Ag/HfO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> based threshold switch (TS) with selectivity~10 <sup xmlns:xlink="http://www.w3.org/1999/xlink">7</sup> , high ON-state current (Ion) of 100μA, and ~10pA leakage current. The thresholding characteristics the TS result from electrically triggered spontaneous formation rupture an Ag filament which acts interstitial dopant in HfO insulating matrix. Further, we...
We investigate the electronic properties of Germanane and analyze its importance as 2-D channel material in switching devices. Considering two types morphologies, namely, chair boat, we study real band structure, effective mass variation, complex structure unstrained by density-functional theory. The morphology turns out to be a more for devices than boat morphology. Furthermore, effect elastic strain, van der Waals force, vertical electric field on these properties. Due very low with...
Shift current is the dominant dc-current response in bulk photovoltaic effect (BPVE), which conversion of solar energy into electricity materials with broken inversion symmetry. While guiding principle BPVE a lack symmetry material also results ferroelectricity, it therefore, expected that significantly large shift achieved ferroelectric materials. In this work, we calculate using first principles two-dimensional...
Sixty-one clinical strains of Vibrio cholerae Ol El Tor isolated in Calcutta before, during, and after the V. O139 Bengal outbreak were examined to see if O1 post-O139 period different from those existence before. Comparison restriction fragment length polymorphism rRNA genes (ribotyping) CTX genetic element revealed that all "before" except 1 belonged a single known ribotype, whereas "after" 2 hitherto undescribed ribotype. Also, 23 25 harbored two or more copies tandem also "free" RS1 away...
Tantalum disulfide (TaS2) is a transition metal dichalcogenide (TMD) that exhibits phase induced electronic property modulation at low temperature. However, the appropriate must be grown to enable semiconductor/metal of interest for next generation applications. In this work, we demonstrate direct and controllable synthesis ultra-thin 1T-TaS2 2H-TaS2 on variety substrates (sapphire, SiO2/Si, graphene) via powder vapor deposition. The process leads single crystal domains ranging from 20 200...
We establish an active electrode (AE) selection criterion for volatile and non-volatile switching in metallic conducting bridge (CB) RAM, relevant to cross-point selector memory applications. Using first principle calculations, we show that: (a) versus is determined by the energy difference A between cluster configuration of AE atoms high-resistance (HRS) state, filament low-resistance (LRS) state; achieved when large, whereas system will exhibit behavior ~ 0; (b) maximum LRS (ON-state)...
Two-dimensional (2D) materials with intrinsic piezo- and ferro-electricity are highly prospective in designing novel catalysts for green hydrogen generation. This work systematically investigates the photocatalytic piezocatalytic capabilities of buckled hexagonal (h-) NbP NbN ferroelectric monolayers utilizing hybrid density functional theory (DFT) calculations. First, we delve into monolayers' structural, electronic, ferroelectric, optical properties. reveals that can drive evolution...
We present a detailed study on fabrication and characterization of Ge/GeSn heterojunction p-type tunnel-field-effect-transistors (TFETs). Critical process modules as high-k stack p-i-n diodes are addressed individually. As result an ultrathin equivalent oxide thickness 0.84 nm with accumulation capacitance 3 μF/cm <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> was achieved extremely scaled tri-layer GeSnOx/Al O...
We studied the restriction fragment length polymorphism of rRNA gene and CTX genetic element in Vibrio cholerae O139 Bengal, which resurged Calcutta September 1996 after a gap 32 months. While strains from this resurgence were indistinguishable earlier by ribotyping, structure present current was found to be unconventional.
Summary Sixty-nine strains of Vibrio cholerae 01 isolated at different times were analysed to investigate if there any differences among the before, during and after advent O139 serogroup. Of 69 examined, 68 belonged Ogawa serotype while one Inaba serotype. With exception strain all other V. eltor biotype. A single O1 before emergence serogroup could not be classified as either or classical biotype because it was resistant both specific bacteriophages. Marked variations in susceptibility...
We present a computational study on the impact of tensile/compressive uniaxial ($\varepsilon_{xx}$) and biaxial ($\varepsilon_{xx}=\varepsilon_{yy}$) strain monolayer MoS$_{2}$ NMOS PMOS FETs. The material properties like band structure, carrier effective mass multi-band Hamiltonian channel, are evaluated using Density Functional Theory (DFT). Using these parameters, self-consistent Poisson-Schrödinger solution under Non-Equilibrium Green's Function (NEGF) formalism is carried out to...
Rotavirus infections, prevalent in human populations worldwide are mostly caused by Group A viruses. Live attenuated rotavirus vaccines highly effective preventing severe gastroenteritis. However, the cost of these and local availability can be a barrier for widespread adoption public health programs developing countries where infants suffer heavy burden related morbidity mortality. phase I/II study was carried out with long term aim to produce locally licensed vaccine which is equally safe...
We experimentally demonstrate and benchmark the performance of p-channel TFETs (PTFETs) comparing Group III-V (In <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.65</sub> Ga xmlns:xlink="http://www.w3.org/1999/xlink">0.35</sub> As/GaAs xmlns:xlink="http://www.w3.org/1999/xlink">0.4</sub> SW xmlns:xlink="http://www.w3.org/1999/xlink">0.6</sub> ) against IV (Ge/Ge xmlns:xlink="http://www.w3.org/1999/xlink">0.93</sub> Sn...
Spintronic functionality in ferromagnetic materials is a next-generation technique, to be used data storage, high-frequency communications, and logic devices with minimum energy consumption. Ultra-low consumption high-speed can envisioned by inducing behavior into room temperature multiferroic materials. However, there scarcity of which have definite spin degree freedom. To fully exploit these technological challenges, we introduce the induced ferromagnetism bismuth ferrite (BiFeO3, BFO)...
A large ferroelectric (FE) polarization and low bandgap are essential to improving the bulk photovoltaic response which is generation of photocurrent in polar non-centrosymmetric materials such as FE perovskite oxides. Among various oxides, Potassium Niobate (KNbO3, KNO) a promising material for applications its can be tuned effectively by strain, doping, or applying an electric field. In this work, using density functional theory calculations, we present insight into strain engineering...
The magnetostructural phase transition in Fe50Al50 alloy with chemically ordered paramagnetic B2 and disordered ferromagnetic (FM) A2 has applications spintronics such as phase-change magnetic memory magnonic devices. We first conducted a systematic first-principles density functional theory study of the phases alloy. A theoretical understanding this equiatomic alloy’s electronic spin-dynamical properties leads us to experimental exploration FM phase. Therefore, we deposit 50 nm thin film...