Publications (116)
Dynamics of 2D Monolayer Confined Water in Hydrophobic and Charged Environments
Pradeep Kumar
Using molecular dynamics simulations we study the dynamics of a water-like TIP5P model of water in hydrophilic and hydrophobic confinement. We find that in case of extreme nanocofi…
Charging capacitors from thermal fluctuations using diodes
P. M. Thibado, J. C. Neu, Pradeep Kumar +2
We theoretically consider a graphene ripple as a Brownian particle coupled to an energy storage circuit. When circuit and particle are at the same temperature, the second law forbi…
Diverse Trends of Electron Correlation Effects for Properties with Different Radial and Angular Factors in an Atomic System: A case study in Ca
Pradeep Kumar, Cheng-Bin Li, B. K. Sahoo
Atomic properties such as field shift constants, magnetic dipole and electric quadrupole hyperfine structure constants, Landé factors, and electric quadrupole moments that a…
Orbiton-Phonon coupling in Ir5+(5d4) double perovskite Ba2YIrO6
Birender Singh, G. A. Cansever, T. Dey +4
Ba2YIrO6, a Mott insulator, with four valence electrons in Ir5+ d-shell (5d4) is supposed to be non-magnetic, with Jeff = 0, within the atomic physics picture. However, recent sugg…
Thermal Expansion Coefficient and Phonon Dynamics in Coexisting Allotropes of Monolayer WS2 Probed by Raman Scattering
Deepu Kumar, Birender Singh, Pawan Kumar +2
We report a comprehensive temperature dependent Raman measurements on three different phases of monolayer WS2 from 4K to 330K in a wide spectral range. Our studies revels the anoma…
Tuning the ferro- to para-electric transition temperature and dipole orientation of group-IV monochalcogenide monolayers
Salvador Barraza-Lopez, Thaneshwor P. Kaloni, Shiva P. Poudel +1
Coordination-related, two-dimensional (2D) structural phase transitions are a fascinating and novel facet of two-dimensional materials with structural degeneracies. Nevertheless, a…
Exciton dynamics and exciton-phonon coupling in bulk and thin flakes of layered van der Waals antiferromagnet NiPS
Nasaru Khan, Yuliia Shemerliuk, Sebastian Selter +3
The Zhang-Rice (ZR) singlet is an intriguing quantum state offering potential to realize a spin-orbit-entangled bosonic quasiparticle, which gives rise to the Zhang-Rice exciton. I…
Structural phase transition and material properties of few-layer monochalcogenides
Mehrshad Mehboudi, Benjamin M. Fregoso, Yurong Yang +6
GeSe and SnSe monochalcogenide monolayers and bilayers undergo a two-dimensional phase transition from a rectangular unit cell to a square unit cell at a temperature well bel…
Significance of Mobility on Received Signal Strength: An Experimental Investigation
Pavan Kumar Pedapolu, Pradeep Kumar, Vaidya Harish +4
In this paper, estimation of mobility using received signal strength is presented. In contrast to standard methods, speed can be inferred without the use of any additional hardware…
Non-Markovian evolution: a quantum walk perspective
Pradeep Kumar, Subhashish Banerjee, R. Srikanth +2
Quantum non-Markovianity of a quantum noisy channel manifests typically as information backflow, characterized by the departure of the intermediate map from complete positivity, th…
High Field Ultrasound Measurements in UPt3 and the Single Energy Scale Model of Metamagnetism
B. S. Shivaram, V. W. Ulrich, Pradeep Kumar +1
We report longitudinal ultrasound velocity measurements for magnetic fields up to 33 T applied parallel to the a-axis of the heavy electron compound UPt. A characteristic dip…
Effect of water-wall interaction potential on the properties of nanoconfined water
Pradeep Kumar, Francis W. Starr, Sergey V. Buldyrev +1
Much of the understanding of bulk liquids has progressed through study of the limiting case in which molecules interact via purely repulsive forces, such as a hard-core potential.…
Quantitative Lineshape Analysis for Arbitrary Inhomogeneity in Two-Dimensional Coherent Spectroscopy
Bhaskar De, Pradeep Kumar, Krishna K. Maurya +2
Two-dimensional coherent spectroscopy (2DCS) provides simultaneous measurement of homogeneous and inhomogeneous linewidths through quantitative lineshape analysis. However, convent…
Molecular Scale Hydrophobicity in Varying Degree of Planar Hydrophobic Nanoconfinement
Sudip Nepal, Pradeep Kumar
We have studied the molecular scale hydrophobicity of an apolar solute, argon, confined between hydrophobic planar surfaces with different confinement widths. Specifically, we find…
Effects of Next-Nearest-Neighbor Hopping on the Hole Motion in an Antiferromagnetic Background
Avraham Schiller, Pradeep Kumar, Rainer Strack +1
In this paper we study the effect of next-nearest-neighbor hopping on the dynamics of a single hole in an antiferromagnetic (Néel) background. In the framework of large dimensions…
Fluctuating Fractionalized Spins in Quasi Two-dimensional Magnetic V0.85PS3
Vivek Kumar, Deepu Kumar, Birender Singh +5
Quantum spin liquid (QSL), a state characterized by exotic low energy fractionalized excitations and statistics is still elusive experimentally and may be gauged via indirect exper…
Effects of Diffuse and Collimated Beam Radiation on a Symmetrical Cooling Case of Natural Convection
G. Chanakya, Pradeep Kumar
In the present work, the effects of diffuse and collimated radiation on the symmetrical cooling case of natural convection in a two-dimensional cavity heated from the bottom have b…
Absence of a Diffusion Anomaly in Water Perpendicular to Hydrophobic Nanoconfining Walls
Sungho Han, Pradeep Kumar, H. Eugene Stanley
We perform molecular dynamics simulations to investigate the diffusive motion of TIP5P water in the direction perpendicular to the two hydrophobic confining walls. To calculate the…
Phonon Anomalies, Orbital-Ordering and Electronic Raman Scattering in iron-pnictide Ca(Fe0.97Co0.03)2As2: Temperature-dependent Raman Study
Pradeep Kumar, D. V. S. Muthu, L. Harnagea +3
We report inelastic light scattering studies on Ca(Fe0.97Co0.03)2As2 in a wide spectral range of 120-5200 cm-1 from 5K to 300K, covering the tetragonal to orthorhombic structural t…
Tunable Resonance and Electron-Phonon Coupling in Layered MoS2
Deepu Kumar, Nasaru Khan, Rahul Kumar +2
Resonance Raman scattering, a very effective and sensitive technique for atomically thin semiconducting transition metal dichalcogenide, can be used to observe the phonons from the…
Load Balanced Demand Distribution under Overload Penalties
Sarnath Ramnath, Venkata M. V. Gunturi, Subi Dangol +2
Input to the Load Balanced Demand Distribution (LBDD) consists of the following: (a) a set of public service centers (e.g., schools); (b) a set of demand (people) units and; (c) a…
Unravelling the coupling between excitonic quasiparticles-electron-phonon and role of interlayer coupling in vertically and horizontally aligned layered MoS2
Deepu Kumar, Rahul Kumar, Mahesh Kumar +1
Excitonic quasi-particles, excitons/trions/bi-excitons, and their coupling with phonons and charge carriers play a crucial role in controlling the optical properties of atomically…
Interplay of phonons, intertwined density waves, and induced spin density wave in trilayer nickelates Pr4-xLaxNi3O10
Sonia Deswal, Dibyata Rout, Nirmalya Jana +3
Lattice degrees of freedom (DoF) play a central role in correlated electron systems, strongly influencing the dynamics of the underlying charge carriers and spin excitations. In ni…
Finite frequency Seebeck coefficient of metals: A memory function approach
Pankaj Bhalla, Pradeep Kumar, Nabyendu Das +1
We study the dynamical thermoelectric transport in metals subjected to the electron-impurity and the electron-phonon interactions using the memory function formalism. We introduce…
Proximate transition temperatures amplify linear magnetoelectric coupling in strain-disordered multiferroic BiMnO3
Patrick R. Mickel, Hyoungjeen Jeen, Pradeep Kumar +2
We report a giant linear magnetoelectric coupling in strained BiMnO3 thin films in which the disorder associated with an islanded morphology gives rise to extrinsic relaxor ferroel…
Terrestrial Very-Long-Baseline Atom Interferometry: Workshop Summary
Sven Abend, Baptiste Allard, Iván Alonso +250
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around the world…
Deep Learning to Address Candidate Generation and Cold Start Challenges in Recommender Systems: A Research Survey
Kiran Rama, Pradeep Kumar, Bharat Bhasker
Among the machine learning applications to business, recommender systems would take one of the top places when it comes to success and adoption. They help the user in accelerating…
Pressure Effects in Supercooled Water: Comparison between a 2D Model of Water and Experiments for Surface Water on a Protein
Giancarlo Franzese, Kevin Stokely, Xiang-qiang Chu +4
Experiments in bulk water confirm the existence of two local arrangements of water molecules with different densities, but, because of inevitable freezing at low temperature , c…
Kramer doublets, phonons, crystal-field excitations and their coupling in Nd2ZnIrO6
Birender Singh, M. Vogl, S. Wurmehl +3
We report comprehensive Raman-scattering measurements on a single crystal of double-perovskite Nd2ZnIrO6 in temperature range of 4-330 K, and spanning a broad spectral range from 2…
Pressure and temperature dependence of growth and morphology of Escherichia coli: Experiments and Stochastic Model
Pradeep Kumar, Albert Libchaber
We have investigated the growth of Escherichia coli E.coli, a mesophilic bacterium, as a function of pressure and temperature . E.coli can grow and divide in a wide range of…
Pressure and temperature dependence of fluorescence anisotropy of Green Fluorescent Protein
Harpreet Kaur, Khanh Nguyen, Pradeep Kumar
We have studied the effect of high hydrostatic pressure and temperature on the steady state fluorescence anisotropy of Green Fluorescent Protein (GFP). We find that the fluorescenc…
Topology of atomically thin soft ferroelectric membranes at finite temperature
John W. Villanova, Pradeep Kumar, Salvador Barraza-Lopez
One account of two-dimensional (2D) structural transformations in 2D ferroelectrics predicts an evolution from a structure with Pnm2 symmetry into a structure with square P4/nm…
Quantum resources in Harrow-Hassidim-Lloyd algorithm
Pradeep Kumar, Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju +1
Quantum algorithms have the ability to reduce runtime for executing tasks beyond the capabilities of classical algorithms. Therefore, identifying the resources responsible for quan…
Raman evidence for coupling of superconducting quasi-particles with a phonon and crystal field excitation in superconductor Ce0.6Y0.4FeAsO0.8F0.2
Pradeep Kumar, D. V. S. Muthu, J. Prakash +2
We report inelastic light scattering experiments on superconductor Ce0.6Y0.4FeAsO0.8F0.2 from 4K to 300K covering the superconducting transition temperature Tc ~ 48.6K. A strong ev…
Hypersurfaces of a Projective Randers conformal change
V. K. Chaubey, Pradeep Kumar
In the year 1984 Shibata investigated the theory of a change which is called a -change of a Finsler metric. On the other hand in 1985 a systematic study of geometry of hypersu…
Investigation of Thermal Adiabatic Boundary Condition on Semitransparent Wall in Combined Radiation and Natural Convection
G Chanakya, Pradeep Kumar
Two thermal adiabatic boundary conditions arise on the semitransparent window owing to the fact that whether semitransparent window allows the energy to leave the system by radiati…
Superconducting Fluctuations and Anomalous Phonon Renormalization much above superconducting transition temperature in Ca4Al2O5.7Fe2As2
Pradeep Kumar, A. Bera, D. V. S. Muthu +3
Raman studies on Ca4Al2O5.7Fe2As2 superconductor in the temperature range of 5 K to 300 K, covering the superconducting transition temperature Tc ~ 28.3 K, reveal that the Raman mo…
Raman Evidence for Superconducting Gap and Spin-Phonon Coupling in Superconductor Ca(Fe0.95Co0.05)2As2
Pradeep Kumar, Achintya Bera, D. V. S. Muthu +8
Inelastic light scattering studies on single crystal of electron-doped Ca(Fe0.95Co0.05)2As2 superconductor, covering the tetragonal to orthorhombic structural transition as well as…
Evolution of elastic moduli through a two-dimensional structural transformation
Alejandro Pacheco-Sanjuan, Tyler B. Bishop, Erin E. Farmer +2
We use a classical analytical and separable elastic energy landscape describing SnO monolayers to estimate the softening of elastic moduli through a mechanical instability occurrin…
Temperature-dependent Raman study of CeFeAsO0.9F0.1 Superconductor: Crystal field excitations, phonons and their coupling
Pradeep Kumar, Anil Kumar, Surajit Saha +5
We report temperature-dependent Raman spectra of CeFeAsO0.9F0.1 from 4 K to 300 K in spectral range of 60 to 1800 cm-1 and interpret them using estimates of phonon frequencies obta…
Exciton-exciton Interactions -- A Quantitative Comparison Between Complimentary Phenomenological Models
Pradeep Kumar, Bhaskar De, Rishabh Tripathi +1
Many-body interactions (MBIs) such as exciton-exciton interactions significantly affect the optical response of semiconductor nanostructures. These interactions can be rigorously m…
Correlated Paramagnetism and Interplay of Magnetic and Phononic Degrees of Freedom in 3d-5d Coupled La2CuIrO6
Birender Singh, Deepu Kumar, Kaustuv Manna +6
Conventional Paramagnetism - a state with finite magnetic moment per ion sans long range magnetic ordering, but with lowering temperature the moment on each ion picks up a particul…
Thermal Conductivity Minimum: A New Water Anomaly
Pradeep Kumar, H. Eugene Stanley
We report a new anomaly of water, a minimum in the thermal conductivity in the supercooled region. Our findings are consistent with the presence of a liquid-liquid phase transition…
Solubility of nitrogen in methane, ethane, and mixtures of methane and ethane at Titan-like conditions: A molecular dynamics study
Pradeep Kumar, Vincent F. Chevrier
We have studied the temperature dependence of the solubility of nitrogen in methane, ethane, and mixtures of methane and ethane using vapor-liquid equilibrium simulations of binary…
Morphology, cell division, and viability of Saccharomyces cerevisiae at high hydrostatic pressure
Khanh Nguyen, Steven Murray, Jeffery A. Lewis +1
High hydrostatic pressure is commonly encountered in many environments, but the effects of high pressure on eukaryotic cells have been understudied. To understand the effects of hy…
Metamagnetism and the Fifth Order Susceptibility in UPt3
B. S. Shivaram, Brian Dorsey, D. G. Hinks +1
An enhanced susceptibility is a natural consequence of the "heavy fermion" (HF) state rendering the possibility of measurably large nonlinear susceptibilities. In recent work a uni…
The Boson peak in supercooled water
Pradeep Kumar, K. Thor Wikfeldt, Daniel Schlesinger +2
We perform extensive molecular dynamics simulations of the TIP4P/2005 model of water to investigate the origin of the Boson peak reported in experiments on supercooled water in nan…
Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map
Ivan Alonso, Cristiano Alpigiani, Brett Altschul +246
We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportu…
Surface phonons and possible structural phase transition in a topological semimetal PbTaSe2
Vivek Kumar, Pradeep Kumar
Topological insulators are a novel class of quantum materials characterized by protected gapless surface or edge states but insulating bulk states which is due to presence of spin-…
Spectral Tailoring of Inhomogeneous Optical Response Using Two-Dimensional Coherent Spectroscopy
Pradeep Kumar, Rohan Singh
Controlling the coherent optical response of inhomogeneous ensembles is a key challenge in advancing light-matter interaction engineering. We present a comparative study of two spe…
Raman signatures of pressure induced electronic topological and structural transitions in Bi2Te3
Gopal K. Pradhan, Achintya Bera, Pradeep Kumar +2
We report Raman signatures of electronic topological transition (ETT) at 3.6 GPa and rhombohedral (α-Bi2Te3) to monoclinic (β-Bi2Te3) structural transition at ~ 8 GPa. At the ons…
Coupling of lattice, spin and intra-configurational excitations of Eu3+ in Eu2ZnIrO6
Birender Singh, M. Vogl, S. Wurmehl +3
In Eu2ZnIrO6, effectively two atoms are active i.e. Ir is magnetically active, which results in complex magnetic ordering within the Ir sublattice at low temperature. On the other…
Structure of the First and Second Neighbor Shells of Water: Quantitative Relation with Translational and Orientational Order
Zhenyu Yan, Sergey V. Buldyrev, Pradeep Kumar +3
We perform molecular dynamics simulation of water using the TIP5P model to quantify structural order in both the first shell (defined by four nearest neighbors)and second shell (de…
Molecular Dynamics Study of Orientational Cooperativity in Water
Pradeep Kumar, Giancarlo Franzese, Sergey V. Buldyrev +1
Recent experiments on liquid water show collective dipole orientation fluctuations dramatically slower then expected (with relaxation time 50 ns) [D. P. Shelton, Phys. Rev. B {…
Phonon anomalies, Anharmonicity, and thermal expansion coefficient in few layered PtX2 (X= S, Se): A temperature dependent Raman study
Atul G. Chakkar, Chaitanya B. Auti, Gaurav Bassi +2
Two-dimensional group-10 noble transition metal dichalcogenides have garnered growing attention due to their rich physical properties and promising applications across nanoelectron…
Spectroscopic Studies of Iron-based Superconductors, Multi-ferroic Oxides and Double-perovskite: Phonons, Electronic and Spin Excitations
Pradeep Kumar
Raman spectroscopy is a very powerful probe to study the nature of quasi-particle excitations in condensed matter physics. The work presented in this thesis is focused on two diffe…
Pressure and temperature dependence of solubility and surface adsorption of nitrogen in the liquid hydrocarbon bodies on Titan
Pradeep Kumar, Vincent F. Chevrier
We have studied the pressure and temperature dependence of solubility of nitrogen in methane and ethane using vapor-liquid equilibrium simulations of binary mixtures of nitrogen in…
(Pb1-xBix)(Ti1-xMnx)O3: Competing mechanism of Tetragonal-Cubic phase on A/B site modifications
Arun Kumar Yadav, Anita Verma, Birender Singh +8
Structural, vibrational and dielectric properties of (Pb1-xBix)(Ti1-xMnx)O3 (PBTM) (0 x 0.50) polycrystalline ceramics have been examined as a function of temperature. Synchrotron-…
Dynamics of electron-electron correlated to electron-phonon coupled phase progression in trilayer nickelate La4Ni3O10
Sonia Deswal, Deepu Kumar, Dibyata Rout +2
Trilayer nickelates are a rich class of materials exhibiting diverse correlated phenomena, including superconductivity, density wave transitions, non-Fermi liquid behavior along wi…
Two-dimensional disorder in black phosphorus and monochalcogenide monolayers
Mehrshad Mehboudi, Alex M. Dorio, Wenjuan Zhu +6
Ridged, orthorhombic two-dimensional atomic crystals with a bulk {\em Pnma} structure such as black phosphorus and monochalcogenide monolayers are an exciting and novel material pl…
Relativistic coupled-cluster theory analysis of unusually large correlation effects in the determination of factors in Ca
B. K. Sahoo, Pradeep Kumar
We investigate roles of electron correlation effects in the determination of the factors of the , , , , and $3…
Raman evidence for Orbiton-Mediated Multiphonon Scattering in Multiferroic TbMnO
Pradeep Kumar, Surajit Saha, D. V. S. Muthu +3
Temperature-dependent Raman spectra of TbMnO from 5 K to 300 K in the spectral range of 200 to 1525 cm show five first-order Raman allowed modes and two high frequency m…
Exciton dynamics, Fano quantum interference and d-d excitation in the single crystal of two-dimensional antiferromagnetic Fe2P2S6
Nasaru Khan, Yuliia Shemerliuk, Sebastian Selter +3
Excitonic quasiparticle and their interactions with phonons, magnons and charge carriers may play a pivotal role in governing the optical properties and their correlation with magn…
Coherent Nonlinear Optical Response for High-Intensity Excitation
Rishabh Tripathi, Krishna K. Maurya, Pradeep Kumar +2
Calculation of the coherent nonlinear response of a system is essential to correctly interpret results from advanced techniques such as two-dimensional coherent spectroscopy (2DCS)…
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…
Single-GPU GNN Systems: Traps and Pitfalls
Yidong Gong, Arnab Tarafder, Saima Afrin +1
The current graph neural network (GNN) systems have established a clear trend of not showing training accuracy results, and directly or indirectly relying on smaller datasets for e…
Nonreciprocal Bloch Oscillations in Magneto-Optic Waveguide Arrays
Miguel Levy, Pradeep Kumar
We show that nonreciprocal optical Bloch-like oscillations can emerge in transversely magnetized waveguide arrays in the presence of an effective index step between the waveguides.…
Thermodynamics, Structure, and Dynamics of Water Confined between Hydrophobic Plates
Pradeep Kumar, Sergey V. Buldyrev, Francis W. Starr +2
We perform molecular dynamics simulations of 512 water-like molecules that interact via the TIP5P potential and are confined between two smooth hydrophobic plates that are separate…
Amino Acid Distributions and the Effect of Optimal Growth Temperature
Benjamin Greenbaum, Pradeep Kumar, Albert Libchaber
We perform an exhaustive analysis of genome statistics for organisms, particularly extremophiles, growing in a wide range of physicochemical conditions. Specifically, we demonstrat…
Anisotropic Electron-Photon-Phonon Coupling in Layered MoS2
Deepu Kumar, Birender Singh, Rahul Kumar +2
Transition metal dichalcogenide, especially MoS2 has attracted lot of attention recently owing to its tunable visible range band gap and anisotropic electronic and transport proper…
A model field theory with potential: Kinks with super-exponential profiles
Pradeep Kumar, Avinash Khare, Avadh Saxena
We study a (1+1)-dimensional field theory based on potential. There are three degenerate minima at and . There are novel, asymmetric kink solutions…
Hysteretic Phonons and Quasielastic Response: A Raman Study of Thermal Memory in Two-dimensional CuCrP2S6
Chaitanya B. Auti, Atul G. Chakkar, Sebastian Selter +4
We present a comprehensive temperature and polarization dependent inelastic light scattering (Raman) study on single crystals of two-dimensional CuCrP2S6, a layered van der Waals m…
Breakdown of Stokes-Einstein relation in supercooled water
Pradeep Kumar
Water displays breakdown of the Stokes-Einstein relation at low temperatures. We hypothesize that the breakdown is a result of the structural changes and a sharp rise in dynamic he…
Dependence of loss rate of electrons due to elastic gas scattering on the shape of the vacuum chamber in an electron storage ring
Pradeep Kumar, Gurnam Singh, A. D. Ghodke +1
The beam lifetime in an electron storage ring is also limited by the loss rate of the stored electrons due to the elastic coulomb scattering of electrons with the nuclei of residua…
Hidden Quantum State and Signature of Mott Transition in Two-dimensional 1T-TaS2
Vivek Kumar, Birender Singh, Pradeep Kumar
Here we report a comprehensive inelastic light scattering studies on 1T-TaS2 with different thickness. This compound is well known for its rich charge density wave phases. Along wi…
Terrestrial Very-Long-Baseline Atom Interferometry: Summary of the Second Workshop
Adam Abdalla, Mahiro Abe, Sven Abend +307
This summary of the second Terrestrial Very-Long-Baseline Atom Interferometry (TVLBAI) Workshop provides a comprehensive overview of our meeting held in London in April 2024, build…
Coupled Phonons, Magnetic Excitations and Ferroelectricity in AlFeO3: Raman and First-principles Studies
Pradeep Kumar, A. Bera, D. V. S. Muthu +7
We determine the nature of coupled phonons and magnetic excitations in AlFeO3 using inelastic light scattering from 5 K to 315 K covering a spectral range from 100-2200 cm-1 and co…
Davydov Splitting, Resonance Effect and Phonon Dynamics in CVD grown Layered MoS2
Deepu Kumar, Birender Singh, Rahul Kumar +2
We present a comprehensive temperature dependent Raman measurements for horizontally aligned CVD grown layered MoS2 in a temperature range of 4 to 330 K under resonance condition.…
Kitaev Magnetism and Fractionalized Excitations in Double Perovskite Sm2ZnIrO6
Birender Singh, M. Vogl, S. Wurmehl +3
The quest for Kitaev spin liquids in particular three dimensional solids is long sought goal in condensed matter physics, as these states may give rise to exotic new types of quasi…
Estimation of thermal load on the nozzle base plate from small plumes at high temperature
Kamal Khemani, Pradeep Kumar, Ganesh Natarajan
A numerical study is performed to estimate thermal load on the nozzle base plate, which is in the upstream direction to the flow, from three hot plumes of pure (CO2), (H2O) and 50-…
Anomalous Phonon Renormalization in Single Crystal of Silicon
Himanshi, Birender Singh, Pradeep Kumar
The temperature dependence of the first-order phonon mode of single crystal of Silicon (Si) is determined by Raman scattering in a broad temperature range of 4-623 K. Our studies r…
Temperature dependent magnetic, dielectric and Raman studies of partially disordered La2NiMnO6
Pradeep Kumar, S. Ghara, B. Rajeswaran +3
We report a detailed magnetic, dielectric and Raman studies on partially disordered and biphasic double perovskite La2NiMnO6. DC and AC magnetic susceptibility measurements show tw…
Properties of Phase transitions of a Higher Order
Pradeep Kumar
The following is a thermodynamic analysis of a III order (and some aspects of a IV order) phase transition. Such a transition can occur in a superconductor if the normal state is a…
Investigations of Non-Gray/Gray Radiative Heat Transfer Effect on Natural Convection in Tall Cavities at Low Operating Temperature
Pradeep Kumar, G. Chanakya, Naman Barthwal
The present work numerically investigates the influence of radiation on the natural convection in differentially heated slender and square-base tall cavities at low operating tempe…
Temperature Dependence of Nonlinear Susceptibilities in an Infinite Range Interaction Model
Pradeep Kumar, Christopher E. Wagner
We present a model to probe metamagnetic properties in systems with an arbitrary number of interacting spins. Thermodynamic properties such as the magnetization per particle $m(B,T…
Evolution of Magnetic Properties of Lightly Doped Copper Oxides
L. P. Gor'kov, V. Nikos Nicopoulos, Pradeep Kumar
We study how doping destroys the AF order in the layered cuprates within the framework of the charge--transfer insulator concept. We use the criterion of stability of the AF backgr…
Broken weak and strong spin rotational symmetries and tunable interaction between phonon and the continuum in Cr2Ge2Te6
Atul G. Chakkar, Deepu Kumar, Pradeep Kumar
Phase transitions with lowering temperature is a manifestation of decreased entropy and within the Landau theoretical framework these are accompanied by the symmetry breaking. When…
Temperature-Dependent Infrared Reflectivity Studies of Multiferroic TbMnO_{3}: Evidence for Spin-Phonon Coupling
Pradeep Kumar, Surajit Saha, C. R. Serrao +2
We have measured near normal incidence far infrared (FIR) reflectivity spectra of a single crystal of TbMnO3 from 10K to 300K in the spectral range of 50 cm to 700 cm…
Anomalous Raman scattering from phonons and electrons of superconducting FeSe
Pradeep Kumar, Anil Kumar, Surajit Saha +6
We report interesting anomalies in the temperature dependent Raman spectra of FeSe measured from 3K to 300K in the spectral range from 60 to 1800 cm and determine t…
Weakly supervised information extraction from inscrutable handwritten document images
Sujoy Paul, Gagan Madan, Akankshya Mishra +3
State-of-the-art information extraction methods are limited by OCR errors. They work well for printed text in form-like documents, but unstructured, handwritten documents still rem…
Space-Time Correlations in the Orientational Order Parameter and the Orientational Entropy of Water
Pradeep Kumar, Sergey V. Buldyrev, H. Eugene Stanley
We introduce the spatial correlation function and temporal autocorrelation function of the local tetrahedral order parameter . Using computer simu…
Electron-Phonon Coupling, Thermal Expansion Coefficient, Resonance Effect and Phonon Dynamics in High Quality CVD Grown Mono and Bilayer MoSe2
Deepu Kumar, Vivek Kumar, Rahul Kumar +2
Probing phonons, quasi-particle excitations and their coupling has enriched our understanding of these 2D materials and proved to be crucial for developing their potential applicat…
Flow Characterization in Triply-Periodic-Minimal-Surface (TPMS) based Porous Geometries: Part 1 -- Hydrodynamics
Surendra Singh Rathore, Balkrishna Mehta, Pradeep Kumar +1
The modeling of flow and heat transfer in porous media systems have always been a challenge and, the extended Darcy transport models for flow and equilibrium and non-equilibrium en…
Effects of Semitransparent Window AspectRatio on Interaction of Collimated Beam withNatural Convection: Part I
G. Chanakya, Pradeep Kumar
The effects of the semitransparent winodw's aspect ratio on the interaction of the collimated beam with natural convection have been investigated numerically in the present work. T…
Spatial Structures in a Generalized Ginzburg-Landau Free Energy
Abdel-Khalek Farid, Yonggang Yu, Avadh Saxena +1
Searching for characteristic signatures of a higher order phase transition (specifically of order three or four), we have calculated the spatial profiles and the energies of a spat…
Theory of the Dynamical Thermal conductivity of Metals
Pankaj Bhalla, Pradeep Kumar, Nabyendu Das +1
The Mori's projection method, known as memory function method is an important theoretical formalism to study various transport coefficients. In the present work, we calculate the d…
Raman Spectroscopic Investigation of Kitaev Quantum Spin Liquids
Vivek Kumar, Pradeep Kumar
Quantum spin liquids, a highly topologically entangled, dynamically correlated state where quantum fluctuations preclude any long-range ordering down to absolute zero. In the searc…
Understanding and Reducing Metadata-Driven Host Overheads in Sampling-Based GNN Training
Yidong Gong, Saima Afrin, Yuchen Ma +3
Modern deep learning workloads increasingly exhibit dynamic, metadata-driven execution, where runtime-generated information determines memory provisioning and kernel launch decisio…
Interplay of topology and antiferromagnetic order in two-dimensional van der Waals crystals of (NixFe1-x)2P2S6
N. Khan, D. Kumar, V. Kumar +6
Mermin-Wagner theorem forbid spontaneous symmetry breaking of spins in one/two-dimensional systems at finite temperature and rules out the stabilization of this ordered state. Howe…
Effect of pressure on the kinetics of bulge bases in small RNAs
Pradeep Kumar, J. Lehmann, A. Libchaber
Using molecular dynamics simulations, we study the effect of pressure on the binding propensity of small RNAs by calculating the free energy barrier corresponding to the looped out…