Publications (95)
Quantum-Enhanced Plasmonic Sensing
Mohammadjavad Dowran, Ashok Kumar, Benjamin J. Lawrie +2
Quantum resources can enhance the sensitivity of a device beyond the classical shot noise limit and, as a result, revolutionize the field of metrology through the development of qu…
Physical and Dielectric Properties of Polycrystalline LaVNbO
Ashok Kumar, Simranjot K. Sapra, Ramcharan Meena +3
We report a detailed investigation of the structural, electronic, vibrational, and dielectric properties of polycrystalline LaVNbO samples, prepared at two sint…
Anisotropic Spatial Entanglement
Satyajeet Patil, Shashi Prabhakar, Ayan Biswas +2
The photon-pairs generated through spontaneous parametric down-conversion (SPDC) possess strong correlations in their transverse position and momentum degrees of freedom. For such…
Study of the Bound State, Electron-Detachment Energy and Reactivity of Hydride Ion using Variational Quantum Eigensolver
Abdul Kalam, Ashok Kumar, Prasanta K. Panigrahi
The accurate prediction and understanding of molecular energy and chemical reactivity are fundamental pursuits in the field of molecular quantum chemistry. With the limitations of…
NbOx based memristor as artificial synapse emulating short term plasticity
Sweety Deswal, Ashok Kumar, Ajeet Kumar
Memristors can mimic the functions of biological synapse, where it can simultaneously store the synaptic weight and modulate the transmitted signal. Here, we report Nb/Nb2O5/Pt bas…
Ferroelectric Capped Magnetization in Multiferroic PZT/LSMO Tunnel Junctions
Ashok Kumar, D. Barrionuevo, N Ortega +4
Self-poled ultra-thin ferroelectric PbZr0.52Ti0.48O3 (PZT) (5 and 7 nm) films have been grown by pulsed laser deposition technique on ferromagnetic La0.67Sr0.33MnO3 (LSMO) (30 nm)…
Measuring Mueller matrix of an arbitrary optical element with a fixed set of polarization optics
Salla Gangi Reddy, Shashi Prabhakar, A. Aadhi +4
We have described a novel way to determine the Mueller matrix of any optical element by using projection method. For this purpose, we have used two universal SU(2) gadgets for pola…
Study of RPC bakelite electrodes and detector performance for INO-ICAL
Ashok Kumar, Ankit Gaur, Md. Hasbuddin +5
The Resistive Plate Chambers (RPCs) are going to be used as the active detectors in the India-based Neutrino Observatory (INO)-Iron Calorimeter (ICAL) experiment for the detection…
Einstein-Podolsky-Rosen Paradox with Position-Momentum Entangled Macroscopic Twin Beams
Ashok Kumar, Gaurav Nirala, Alberto M. Marino
Spatial entanglement is at the heart of quantum enhanced imaging applications and high-dimensional quantum information protocols. In particular, for imaging and sensing application…
Stability and Carrier Transport Properties of Phosphorene Based Polymorphic Nanoribbons
Sumandeep Kaur, Ashok Kumar, Sunita Srivastava +2
A few-layer black phosphorene has recently gained significant interest in the scientific community. In this paper, we consider several polymorphs of phosphorene nanoribbons (PNRs)…
Tunable resonant Raman scattering with temperature in vertically aligned 2H-SnS2
Atul G. Chakkar, Deepu Kumar, Ashok Kumar +2
Two-dimensional semiconducting materials have a wide range of applications in various fields due to their excellent properties and rich physics. Here, we report a detailed investig…
Ion implantation in \b{eta}-Ga2O3: physics and technology
Alena Nikolskaya, Evgenia Okulich, Dmitry Korolev +12
Gallium oxide and in particular its thermodynamically stable \b{eta}-Ga2O3 phase is within the most exciting materials in research and technology nowadays due to its unique propert…
Unipolar resistive switching in cobalt titanate thin films
Atul Thakre, A. K. Shukla, R. S. Katiyar +1
We report giant resistive switching of an order of 104, long-time charge retention characteristics up to 104 s, non-overlapping SET and RESET voltages, ohmic in low resistance stat…
Higher order optical vortices and formation of speckles
Salla Gangi Reddy, Shashi Prabhakar, Ashok Kumar +2
We have experimentally generated higher order optical vortices and scattered them through a ground glass plate that results in speckle formation. Intensity autocorrelation measurem…
Fundamental Sensitivity Bounds for Quantum Enhanced Optical Resonance Sensors Based on Transmission and Phase Estimation
Mohammadjavad Dowran, Timothy S. Woodworth, Ashok Kumar +1
Quantum states of light can enable sensing configurations with sensitivities beyond the shot-noise limit (SNL). In order to better take advantage of available quantum resources and…
Investigating Unipolar Switching in Niobium Oxide Resistive Switches: Correlating Quantized Conductance and Mechanism
Sweety Deswal, Ashok Kumar, Ajeet Kumar
Memory devices based on resistive switching (RS) have not been fully realised due to lack of understanding of the underlying switching mechanisms. Nature of ion transport responsib…
Pyroelectric Control of Spin Polarization Assisted Coexistence of Giant Positive and Negative Magnetocaloric Effects
Gaurav Vats, Ashok Kumar, Ram S. Katiyar +1
Electric field control of magnetism is the key to many next generation spintronics applications1. Ferroelectric control of spin polarization2,3 followed by the electrically driven…
Magnetic control of large room-temperature polarization
Ashok Kumar, G. L. Sharma, R. S. Katiyar R. Pirc +1
Numerous authors have referred to room-temperature magnetic switching of large electric polarizations as The Holy Grail of magnetoelectricity.We report this long-sought effect usin…
Spatial squeezing in bright twin beams generated with four-wave mixing: constraints on characterization with an EMCCD camera
Ashok Kumar, Alberto M. Marino
The observation of spatial quantum noise reduction, or spatial squeezing, with a large number of photons can lead to a significant advantage in quantum imaging and quantum metrolog…
Observation of the rare decay from the combined analysis of CMS and LHCb data
The CMS, LHCb Collaborations, : +2807
A joint measurement is presented of the branching fractions and in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data…
Quantum Computing of Phonon Spectra and Thermal Properties of Crystalline Solids
Naman Khandelwal, Bikash K. Behera, Ashok Kumar +1
Variational quantum algorithms offer a promising framework for solving eigenvalue problems on near-term quantum hardware, yet their applicability beyond electronic structure calcul…
On minimal surfaces immersed in three dimensional Kropina Minkowski space
Ranadip Gangopadhyay, Ashok Kumar, Bankteshwar Tiwari
In this paper we consider a three dimensional Kropina space and obtain the partial differential equation that characterizes a minimal surfaces with the induced metric. Using this c…
Impedance Spectroscopy Study in the vicinity of Ferroelectric Phase Transition
Hitesh Borkar, M Tomar, Vinay Gupta +1
An impedance spectroscopy (IS) is a versatile tool to study the effect of grains (bulk), grain boundaries and electrode-electrolyte interface on dielectric and electrical propertie…
Stability tests performed on the triple GEM detector built using commercially manufactured GEM foils in India
Mohit Gola, Shivali Malhotra, Ashok Kumar +1
The Gas Electron Multiplier (GEM) technology is based on thin polymer foils cladded with copper on both the sides with a regular matrix of holes. Due to the limited manufacturing c…
Performance of the triple GEM detector built using commercially manufactured GEM foils in India
Mohit Gola, Aashaq Shah, Asar Ahmed +3
The Gas Electron Multiplier (GEM) detectors has been utilized for various applications due to their excellent spatial resolution, high rate capabilities and flexibility in design.…
Giant Magnetoelectric coupling in Single Phase Pb(Zr0.20Ti0.80)0.70Pd0.30O3-δ Multiferroics
Shalini Kumari, Dhiren K. Pradhan, Nora Ortega +6
During the last fifteen years, multiferroic (MF) research communities have been searching for an alternative room temperature MF material with large magnetoelectric (ME) coupling f…
Janus -PdXY (X/Y = S, Se, Te) Materials with high Anisotropic Thermoelectric Performance
Mukesh Jakhar, Raman Sharma, Ashok Kumar
Two-dimensional (2D) materials have garnered considerable attention as an emerging thermoelectric (TE) material owing to their unique density of state (DOS) near the Fermi level. W…
Localized to delocalized spatial quantum correlation evolution in structured bright twin beams
Jerin A Thachil, Chirang R Patel, U. Ashwin +1
Quantum correlations in the spatial domain hold great promise for applications in quantum imaging, quantum cryptography and quantum information processing, owing to the infinite di…
The Funk-Finsler structure on the unit disc in the hyperbolic plane
Ashok Kumar, Hemangi Madhusudan Shah, Bankteshwar Tiwari
In this paper, we construct the Funk-Finsler structure in various models of the hyperbolic plane. In particular, in the unit disc of the Klein model, it turns out to be a Randers m…
Anomalous change in leakage and displacement currents after electrical poling on lead-free ferroelectric ceramics
Hitesh Borkar, M. Tomar, Vinay Gupta +2
We report the polarization, displacement current and leakage current behavior of a trivalent nonpolar cation Al cation substituted lead free ferroelectric NBT-BT electroceramics wi…
Quantum Information Scrambling and Entanglement: An Elegant Mathematical Connection
Kapil K. Sharma, Rishikant Rajdeepak, Ashok Kumar +1
Studying the behavior of quantum information scrambling in various quantum systems is an active area of research. Recently, Sharma et al. [K.K. Sharma, V.P Gerdt, Quantum Inf. Proc…
Dielectric behavior and impedance spectroscopy of Niobium substituted Lanthanum based orthovanadates at high temperatures
Ashok Kumar, Vikas N. Thakur, Ajay Kumar +3
We present the detailed study of the temperature dependent dielectric properties, impedance spectroscopy and electrical conductivity of LaVNbO ( 0-1) samples pr…
Ferroelectric and Photovoltaic Properties of Transition Metal doped Pb(Zr0.14Ti0.56Ni0.30)O3-delta Thin Films
Shalini Kumari, Nora Ortega, Ashok Kumar +2
We report nearly single phase Pb(Zr0.14Ti0.56Ni0.30)O3-delta(PZTNi30) ferroelectric having large remanent polarization (15-30 μC/cm2), 0.3-0.4 V open circuit voltage (VOC), reduce…
Quantum Sensing with Bright Two-Mode Squeezed Light in a Distributed Network of Gyroscopes
Priyanka M. Kannath, Girish S. Agarwal, Ashok Kumar
Recent developments in quantum technologies have enabled significant improvements in the precision of optical sensing systems. This work explores the integration of distributed qua…
Impact of Single-Mask Hole Asymmetry on the Properties of GEM Detectors
Aashaq Shah, Archana Sharma, Ashok Kumar +2
A single-mask Gas Electron Multiplier (GEM) technique overcomes the cumbersome practice of alignment of two masks and allows the production of foils with very large area as needed…
Multifunctional Magnetoelectric Materials for Device Applications
N. Ortega, Ashok Kumar, J. F. Scott +1
Mutiferroics are a novel class of next generation multifunctional materials, which display simultaneous magnetic spin, electric dipole, and ferroelastic ordering, and have drawn in…
Electronic Structure and Carrier Mobilities of Twisted Graphene Helix
Rajesh Thakur, P. K. Ahluwalia, Ashok Kumar +2
We have investigated the effect of twisting on electronic band structure, effective mass and carrier mobilities of three prototypes of AGNRs (N=6, 7 & 8) using Density functional t…
Timing and Charge measurement of single gap Resistive Plate Chamber Detectors for INO-ICAL Experiment
Ankit Gaur, Ashok Kumar, Md. Naimuddin
The recently approved India-based Neutrino Observatory will use the world's largest magnet to study atmospheric muon neutrinos. The 50 kiloton Iron Calorimeter consists of iron alt…
Comparison of coherence area measurement techniques for bright entangled twin beams
Ashok Kumar, Hayden Nunley, Alberto M. Marino
Quantum states of light with multiple spatial modes are fundamental for quantum imaging and parallel quantum information processing. Thus, their characterization, which can be achi…
The Qualification of GEM detector and its application to Imaging
Asar Ahmed, Ashok Kumar, Md. Naimuddin +2
The Gas Electron Multiplier (GEM) is a new age detector, which can handle the high flux of particles. The GEM foil, which is constructed using 50m highly insulating foil (Kapto…
Systematic study of projectile structure effect on fusion barrier distribution
Pratap Roy, A. Saxena, B. K. Nayak +7
Quasielastic excitation function measurement has been carried out for the He + Th system at =160 with respect to the beam direction, to obtain a rep…
The Long-Baseline Neutrino Experiment: Exploring Fundamental Symmetries of the Universe
LBNE Collaboration, Corey Adams, David Adams +482
The preponderance of matter over antimatter in the early Universe, the dynamics of the supernova bursts that produced the heavy elements necessary for life and whether protons even…
Magnetic Effects on Dielectric and Polarization Behavior of Multiferroic Hetrostructures
Sandra Dussan, Ashok Kumar, J. F. Scott +1
PbZr0.52Ti0.48O3/La0.67Sr0.33MnO3(PZT/LSMO) bilayer with surface roughness ~ 1.8 nm thin films have been grown by pulsed laser deposition on LaAlO3(LAO) substrates. High remnant po…
Characterisation of Glass Electrodes and RPC Detectors for Experiment
Md. Naimuddin, Daljeet Kaur, Purnendu Kumar +5
India-based Neutrino Observatory (INO) is a planned neutrino experiment to be build up in southern part of India.The INO observatory will host a 51 kton Iron Calorimeter (ICAL) det…
Parallel Quantum-Enhanced Sensing
Mohammadjavad Dowran, Aye L. Win, Umang Jain +4
Quantum metrology takes advantage of quantum correlations to enhance the sensitivity of sensors and measurement techniques beyond their fundamental classical limit given by the sho…
As-based ternary Janus monolayers for efficient thermoelectric and photocatalytic applications
Poonam Chauhan, Jaspreet Singh, Ashok Kumar
Highly efficient and sustainable resources of energy are of great demand today to combat with environmental pollution and the energy crisis. In this work, we have examined the nove…
Effect of Substrate Temperature on Structural and Magnetic Properties of c-axis Ori-ented Spinel Ferrite Ni0.65Zn0.35Fe2O4 (NZFO) Thin Films
Dhiren K. Pradhan, Shalini Kumari, Dillip K. Pradhan +3
Varying the substrate temperature changes structural and magnetic properties of spinel ferrite NZFO thin films. XRD of films grown at different temperature display only 004 reflect…
Van der Waals Heterostructures Based on Allotropes of Phosphorene and MoSe2
Sumandeep Kaur, Ashok Kumar, Sunita Srivastava +1
The van der Waals heterostructures of allotropes of phosphorene (- and ) with MoSe2 (H-, T-, ZT- and SO-MoSe2) are investigated in the framework of state-of-the-art densi…
Photoconductivity and photo-detection response of multiferroic bismuth iron oxide
Avneesh Anshul, Hitesh Borkar, Paritosh Singh +3
We report visible light detection with in-plane BiFeO3 (BFO) thin films grown on pre-patterned inter-digital electrodes. In-plane configured BFO film displayed photocurrents with a…
Faceting Oscillations in Nano-Ferroelectrics
J. F. Scott, Ashok Kumar
We observe periodic faceting of 8-nm diameter ferroelectric disks on a 10 s time-scale when thin Pb(Zr0.52Ti0.48)O3 (PZT) film is exposed to constant high-resolution transmission e…
Classification analysis of transition-metal chalcogenides and oxides using quantum machine learning
Kurudi V Vedavyasa, Ashok Kumar
Quantum machine learning (QML) leverages the potential from machine learning to explore the subtle patterns in huge datasets of complex nature with quantum advantages. This exponen…
Electron Transport and Thermoelectric Performance of Defected Monolayer MoS2
Munish Sharma, Ashok Kumar, P. K. Ahluwalia
Electronic and thermoelectric properties of a two-dimensional MoS2 monolayer containing atomic defects are investigated using density functional theory. All the atomic defects have…
Isometric models of the Funk disc and the Busemann function
Ashok Kumar, Hemangi Madhusudan Shah, Bankteshwar Tiwari
In this article, we find three isometric models of the Funk disc: Finsler upper half of the hyperboloid of two sheets model, the Finsler band model and the Finsler upper hemi spher…
Search for Dark Matter with LHC proton Beam Dump
Ashok Kumar, Archana Sharma
Dark Matter (DM) comprising particles in the mass range of a few MeV to GeV is waiting to be explored, given the many theoretical models accommodating cosmological abundance. We he…
Generation of Correlated Quantum Random Number Sequences with Bright Twin Beams
Anirudh Shekar, Chirang R. Patel, Jerin A. Thachil +1
Quantum random number generators play a vital role in securing communication and encryption. In the present work, we have produced bright twin beams using four-wave mixing in a dou…
In-plane Dielectric and Magnetoelectric Studies of BiFeO3
Ashok Kumar, J. F. Scott, R. Martinez +2
In-plane temperature dependent dielectric behavior of BiFeO3 (BFO) as-grown thin films show diffuse but prominent phase transitions near 450 (+/-10) K and 550 K with dielectric los…
Physics Potential of the ICAL detector at the India-based Neutrino Observatory (INO)
The ICAL Collaboration, Shakeel Ahmed, M. Sajjad Athar +89
The upcoming 50 kt magnetized iron calorimeter (ICAL) detector at the India-based Neutrino Observatory (INO) is designed to study the atmospheric neutrinos and antineutrinos separa…
Finsler structure of the Apollonian weak metric on the unit disc
Alok Kumar Pandey, Ashok Kumar, Bankteshwar Tiwari
In this paper, we {\it find} the Finsler structure of the Apollonian weak metric on the open unit disc in , which turns out to be a Randers type Finsler structure and…
On Minimal Surfaces of Revolutions Immersed in Deformed Hyperbolic Kropina Space
Ashok Kumar, Ranadip Gangopadhyay, Bankteshwar Tiwari +1
In this paper we consider three dimensional upper half space equipped with various Kropina metrics obtained by deformation of hyperbolic metric of th…
Morphotropic Phase Boundary (MPB) Induced Enhancement of Ferroelectric and Piezoelectric Properties in Li and Ta modified K0.5Na0.5NbO3
Satyaranjan Sahoo, Dhiren K. Pradhan, Shalini Kumari +9
Lead-free (K0.48Na0.48Li0.04)(Nb1-xTax)O3 (KNLNT-x) ceramics were synthesized to study the effects of Li and Ta substitution on phase transition behavior, microstructure, and ferro…
Giant Enhancement in Ferroelectric Polarization under Illumination
Hitesh Borkar, Vaibhav Rao, M Tomar +3
We report optical enhancement in polarization and dielectric constant near room temperature in Pb0.6Li0.2Bi0.2Zr0.2Ti0.8O3 (PLBZT) electro-ceramics; these are doubly substituted me…
Novel optically active lead-free relaxor ferroelectric (Ba0.6Bi0.2Li0.2)TiO3
Hitesh Borkar, Vaibhav Rao, Soma Dutta +6
We discovered a near room temperature lead-free relaxor-ferroelectric (Ba0.6Bi0.2Li0.2)TiO3 (BBLT) having A-site compositional disordered ABO3 perovskite structure. Microstructure-…
Laser based optical interferometer manometer design for primary pressure standard in India
Manoj Das, Sandip Kumar Ghosh, Kuldeep Kumar +3
The SI unit of pressure, i.e. Pascal is realized with mechanical devices such as ultrasonic interferometer manometers and pressure balances for the pressure range 1 Pa to 100 kPa.…
Spatial distribution of Spontaneous Parametric Down-Converted Photons for higher order Optical Vortices
Shashi Prabhakar, Salla Gangi Reddy, A Aadhi +4
We make a source of entangled photons (SEP) using spontaneous parametric down-conversion (SPDC) in a non-linear crystal and study the spatial distribution of photon pairs obtained…
Quantum Computation of the Electronic Structure of Some Prototype Solids
Naman Khandelwal, Nidhi Verma, Pooja Jamdagni +1
Over the last decade, researchers have been working to improve a crucial aspect of quantum computing to predict Hamiltonian energy of solids. Quantum algorithms such as Variational…
Tin Titanate: the hunt for a new ferroelectric perovskite
J. Gardner, Atul Thakre, Ashok Kumar +1
We review all the published literature and show that there is no experimental evidence for homogeneous tin titanate SnTiO3 in bulk or thin-film form. Instead a combination of unrel…
Structural, vibrational and electronic properties of Nb substituted orthovanadates LaVNbO
Ashok Kumar, Anurag Sharma, Madhav Sharma +3
We investigate the structural, vibrational, morphological, and electronic properties of Nb substituted orthovanadate LaVNbO samples prepared by the solid-state reac…
Two Dimensional Allotropes of Arsenene with Wide Range of High and Anisotropic Carrier Mobility
Pooja Jamdagni, Anil Thakur, Ashok Kumar +2
Considering the rapid development of experimental techniques for fabricating 2D materials in recent years, various monolayers are expected to be experimentally realized in the near…
The Funk-Finsler Structure in the Constant Curvature Spaces
Ashok Kumar, Hemangi Madhusudan Shah, Bankteshwar Tiwari
In this paper, we {\it find} the infinitesimal structure of Funk-Finsler metric in spaces of constant curvature. We investigate the geometry of this Funk-Finsler metric by explicit…
Experimental generation of ring-shaped beams with random sources
Salla Gangi Reddy, Ashok Kumar, Shashi Prabhakar +1
We have experimentally reproduced ring shaped beams from the scattered Laguerre-Gaussian and Bessel-Gaussian beams. A rotating ground glass plate is used as a scattering medium and…
Structural phase transitions in perovskite BaCeO3 with data mining and first-principles theoretical calculations
Farha Naaz, Manendra S. Chauhan, Kedar Yadav +3
Several experiments conducted over decades have revealed that the perovskite-structured BaCeO3 goes through a series of temperature-induced structural phase transitions. However, i…
High-temperature spin-wave propagation in BiFeO3: relation to the Polomska transition
Ashok Kumar, J. F. Scott, R. S. Katiyar
In bismuth ferrite thin films the cycloidal spiral spin structure is suppressed, and as a result the spin-wave magnon branches of long wavelength are reduced from a dozen to one, a…
The Impact of Meteorological Factors on Crop Price Volatility in India: Case studies of Soybean and Brinjal
Ashok Kumar, Abbinav Sankar Kailasam, Anish Rai +4
Climate is an evolving complex system with dynamic interactions and non-linear feedback mechanisms, shaping environmental and socio-economic outcomes. Crop production is highly sen…
Stable Robot Motions on Manifolds: Learning Lyapunov-Constrained Neural Manifold ODEs
David Boetius, Abdelrahman Abdelnaby, Ashok Kumar +3
Learning stable dynamical systems from data is crucial for safe and reliable robot motion planning and control. However, extending stability guarantees to trajectories defined on R…
First Principles Study of 2D Ring-Te and its Electrical Contact with Topological Dirac Semimetal
Jaspreet Singh, Ashok Kumar
In recent years, researchers have manifested their interest in the two-dimensional (2D) mono-elemental materials of group-VI elements because of their excellent optoelectronic, pho…
Characterization of 3 mm Glass Electrodes and Development of RPC Detectors for Experiment
Daljeet Kaur, Ashok Kumar, Ankit Gaur +5
India-based Neutrino Observatory (INO) is a multi-institutional facility, planned to be built up in South India. The INO facility will host a 51 kton magnetized Iron CALorimeter (I…
Processing and Characterization of Multiferroic Bi-relaxors
Ashok Kumar, R. S. Katiyar, J. F. Scott
We compare chemical solution deposition (CSD), and pulsed-laser-deposition (PLD), specimens of the new room-temperature, single-phase, multiferroic magnetoelectric, [PbFe2/3W1/3O3]…
Monolayer, Bilayer and Heterostructures of Green Phosphorene for Water Splitting and Photovoltaics
Sumandeep Kaur, Ashok Kumar, Sunita Srivastava +2
We report the results of density functional theory (DFT) based calculations on monolayer and bilayer green phosphorene and their heterostructures with MoSe2. Both monolayer and bil…
Observation of Spatial Quantum Correlations in the Macroscopic Regime
Ashok Kumar, Hayden Nunley, A. M. Marino
Spatial quantum correlations in the transverse degree of freedom promise to enhance optical resolution, image detection, and quantum communications through parallel quantum informa…
First Principles Insight into Antiperovskite c-Na3HS Solid State Electrolyte
Sananya Chakraborty, Nidhi Verma, Ashok Kumar
We explore the potential of novel antiperovskite c-Na3HS to be a solid-state electrolyte for sodium-ion batteries. To investigate the dynamical stability, phase stability, thermal…
Information encoding in the spatial correlations of entangled twin beams
Gaurav Nirala, Siva T. Pradyumna, Ashok Kumar +1
The ability to use the temporal and spatial degrees of freedom of quantum states of light to encode and transmit information is crucial for the implementation of a robust and effic…
Janus -TeX (X = S, Se) Monolayers for Efficient Excitonic Solar Cells and Photocatalytic Water Splitting
Jaspreet Singh, Ashok Kumar
Highly efficient, environmental friendly and renewable sources of energy are of great need today to combat with increasing energy demands and environmental pollution. In this work,…
Development, Characterization and Qualification of first GEM foils produced in India
Aashaq Shah, Asar Ahmed, Mohit Gola +6
The increasing demand for Gas Electron Multiplier (GEM) foils has been driven by their application in many current and proposed high-energy physics experiments. Micropack, a Bengal…
Two-Dimensional -PdX (X = S, Te) Monolayers for Efficient Solar Energy Conversion Applications
Mukesh Jakhar, Ashok Kumar
The search for highly effective and environmentally safe photocatalysts for water splitting and photovoltaic solar cells is essential for renewable solar energy conversion and stor…
Twisted Helical shaped Graphene Nano-Ribbons: Role of Symmetries and Passivation
Rajesh Thakur, P. K. Ahluwalia, Ashok Kumar +2
The Hydrogen and Fluorine planar armchairs graphene nanoribbons (H and F AGNRs), subjected to twist deformation within fixed periodic boundary conditions, eventually morph to a hel…
Development and Commissioning of the HARDROC based Readout for the INO-ICAL Experiment
Ashok Kumar, Ankit Gaur, Aman Phogat +2
Glass based Resistive Plate Chambers (RPCs) are going to be used as an active element in the Iron Calorimeter (ICAL) experiment at the India based Neutrino Observatory (INO), which…
Mechanical, Optical and Thermoelectric Properties of Janus BiTeCl Monolayer
Poonam Chauhan, Jaspreet Singh, Ashok Kumar
We report mechanical, optical and thermoelectric properties of recently fabricated Janus BiTeCl monolayer using density functional and semi-classical Boltzmann transport theory. Ja…
Novel room temperature Multiferroics for Random Access Memory Elements
Ashok Kumar, Ram S. Katiyar, James F. Scott
We have fabricated a variety of "PZT-PFW" (PbZr0.52Ti0.48O3)1-x(PbFe2/3W1/3O3)x [PZTFWx; 0.2 < x < 0.4] single-phase tetragonal ferroelectrics via chemical solution deposition (CSD…
Isotropic uncharged model with compactness and stable con gurations
Amit Kumar Prasad, Jitendra Kumar, Ashok Kumar
In present work, we have studied a new stellar distribution model with spherically symmetric matter and an uncharged isotropic distribution in general relativity. In this model, we…
Electron-Beam Driven Relaxation Oscillations in Ferroelectric Nanodisks
Nathaniel Ng, Rajeev Ahluwalia, Ashok Kumar +3
Using a combination of computational simulations, atomic-scale resolution imaging and phenomenological modelling, we examine the underlying mechanism for nanodomain restructuring i…
Quantum random number generation using spatial quantum noise of light
Mohamed Armoon Shaliq, Ashok Kumar
The paper presents a quantum random number generator that extracts high‑entropy bits from the spatial quantum noise of light measured with a high‑speed EMCCD, achieving a raw rate…
Optically Controlled Polarization in Highly Oriented Ferroelectric Thin Films
Hitesh Borkar, M Tomar, Vinay Gupta +3
The out-of-plane and in-plane polarization of (Pb0.6Li0.2Bi0.2)(Zr0.2Ti0.8)O3(PLBZT) thin film has studied in the dark and under illumination of a weak light source of a comparable…
Tunnelling Characteristics of Stone-Wales Defects in Monolayers of Sn and Group-V Elements
Pooja Jamdagni, Ashok Kumar, Anil Thakur +2
Topological defects in ultrathin layers are often formed during synthesis and processing, thereby, strongly influencing their electronic properties . In this paper, we investigate…
Photocatalytic Properties of Anisotropic -PtX (X= S, Se) and Janus -PtSSe monolayers
Pooja Jamdagni, Ashok Kumar, Sunita Srivastava +2
The highly efficient photocatalytic water splitting to produce clean energy requires novel semiconductor materials to achieve high solar-to-hydrogen energy conversion efficiency. H…
Controlled inter-state switching between quantized conductance states in resistive devices for multilevel memory
Sweety Deswal, Rupali R. Malode, Ashok Kumar +1
A detailed understanding of quantization conductance (QC), their correlation with resistive switching phenomena and controlled manipulation of quantized states is crucial for reali…