Explanipedia

An Attention-Residual Convolutional Network for Real-Time Seizure Classification on Edge Devices Open

Peter Akor, Godwin Enemali, Usman Muhammad, Rajiv R. P. Singh, Hadi Larijani · 2025

Epilepsy affects over 50 million people globally, with accurate seizure type classification directly influencing treatment selection as different seizure types respond to specific antiepileptic medications. Manual electroencephalogram (EEG…

Empirical Performance Analysis of WireGuard vs. OpenVPN in Cloud and Virtualised Environments Under Simulated Network Conditions Open

Joel Anyam, Rajiv R. P. Singh, Hadi Larijani, A. G. D. Philip · 2025

With the rise in cloud computing and virtualisation, secure and efficient VPN solutions are essential for network connectivity. We present a systematic performance comparison of OpenVPN (v2.6.12) and WireGuard (v1.0.20210914) across Azure …

Hierarchical Deep Learning for Comprehensive Epileptic Seizure Analysis: From Detection to Fine-Grained Classification Open

Peter Akor, Godwin Enemali, Usman Muhammad, Rajiv R. P. Singh, Hadi Larijani · 2025

Epileptic seizure detection and classification from EEG recordings faces significant challenges due to extreme class imbalance. Analysis of the Temple University Hospital Seizure (TUSZ) dataset reveals imbalance ratios of 150:1 between com…

On-the-fly Surrogation for Complex Nonlinear Dynamics Open

E. Javier Olucha, Rajiv R. P. Singh, Amritam Das, Roland Tóth · 2025

High-fidelity models are essential for accurately capturing nonlinear system dynamics. However, simulation of these models is often computationally too expensive and, due to their complexity, they are not directly suitable for analysis, co…

Frustrated spin-1/2 Heisenberg model on a Kagome-strip chain: Dimerization and mapping to a spin-orbital Kugel-Khomskii model Open

Sayan Ghosh, Rajiv R. P. Singh, Manoranjan Kumar · 2024

We investigate the quantum phases of a frustrated antiferromagnetic Heisenberg spin-1/2 model Hamiltonian on a Kagome-strip chain (KSC), a one-dimensional analogue of the Kagome lattice, and construct its phase diagram in an extended excha…

Learning Reduced-Order Linear Parameter-Varying Models of Nonlinear Systems Open

Patrick J. W. Koelewijn, Rajiv R. P. Singh, Peter Seiler, Roland Tóth · 2024

In this paper, we consider the learning of a Reduced-Order Linear Parameter-Varying Model (ROLPVM) of a nonlinear dynamical system based on data. This is achieved by a two-step procedure. In the first step, we learn a projection to a lower…

Neuroadaptive Incentivization in Healthcare using Blockchain and IoT Open

Ajay Kumar, Rajiv R. P. Singh, Indranath Chatterjee, Nikita Sharma, Vaishali Rana · 2023

Financially incentivizing health-related behaviors can improve health record outcomes and reduce healthcare costs. Blockchain and IoT technologies can be used to develop safe and transparent incentive schemes in healthcare. IoT devices, su…

Classical and quantum phases of the pyrochlore magnet with Heisenberg and Dzyaloshinskii-Moriya interactions Open

Vincent Noculak, Daniel Lozano‐Gómez, J. Oitmaa, Rajiv R. P. Singh, Yasir Iqbal , et al. · 2023

We investigate the ground state and critical temperature (Tc) phase diagrams of the classical and quantum S=12 pyrochlore lattice with nearest-neighbor Heisenberg and Dzyaloshinskii-Moriya interactions (DMI). We consider ferromagnetic and …

High-temperature magnetization and entropy of the triangular lattice Hubbard model in a Zeeman field Open

Owen Bradley, Yutan Zhang, J. Oitmaa, Rajiv R. P. Singh · 2023

We use strong coupling expansions to calculate the entropy function $S(T,h)$, the magnetization $M(T,h)$, and the double occupancy factor $D(T,h)$ for the half-filled triangular lattice Hubbard model as a function of temperature $T$ and Ze…

Classical and quantum phases of the pyrochlore $S=1/2$ magnet with Heisenberg and Dzyaloshinskii-Moriya interactions Open

Vincent Noculak, Daniel Lozano‐Gómez, J. Oitmaa, Rajiv R. P. Singh, Yasir Iqbal , et al. · 2022

We investigate the ground state and critical temperature phase diagrams of the classical and quantum $S=1/2$ pyrochlore lattice with nearest-neighbor Heisenberg and Dzyaloshinskii-Moriya interactions (DMI). We consider ferromagnetic and an…

Onset of charge incompressibility and Mott gaps in the honeycomb-lattice SU(4) Hubbard model: Lessons for twisted bilayer graphene systems Open

Rahul Hingorani, J. Oitmaa, Rajiv R. P. Singh · 2022

We use finite temperature strong coupling expansions to calculate thermodynamic properties of the Honeycomb-lattice SU(4) Hubbard model. We present numerical results for various properties including chemical potential, compressibility, ent…

Finite-temperature strong-coupling expansions for the Hubbard model Open

Rajiv R. P. Singh, J. Oitmaa · 2022

We develop finite temperature strong coupling expansions for the SU(N)\nHubbard Model in powers of $\\beta t$, $w=\\exp{(-\\beta U)}$ and ${1\\over \\beta\nU}$ for arbitrary filling. The expansions are done in the grand canonical\nensemble…

Instabilities of spin-1 Kitaev spin liquid phase in presence of single-ion anisotropies Open

Owen Bradley, Rajiv R. P. Singh · 2022

We study the spin-one Kitaev model on the honeycomb lattice in the presence of single-ion anisotropies. We consider two types of single ion anisotropies: A $D_{111}$ anisotropy which preserves the symmetry between $X$, $Y$, and $Z$ bonds b…

Magnetism of competing high-spin/low-spin states in and related two-orbital two-electron systems Open

Rajiv R. P. Singh · 2022

We discuss the thermodynamic and magnetic properties of a competing high-spin/low-spin two-orbital two-electron model on a square-lattice possibly relevant to the nickelates such as Ba$_2$NiO$_2$(AgSe)$_2$ (BNOAS). We focus on parameter re…

On the Divergence of the Ferromagnetic Susceptibility in the SU(N) Nagaoka-Thouless Ferromagnet Open

Rajiv R. P. Singh, J. Oitmaa · 2022

Using finite temperature strong coupling expansions for the SU(N) Hubbard Model, we calculate the thermodynamic properties of the model in the infinite-$U$ limit for arbitrary density $0\leq ρ\leq 1$ and all $N$. We express the ferromagnet…

Finite Temperature Strong Coupling Expansions for the SU(N) Hubbard Model Open

Rajiv R. P. Singh, J. Oitmaa · 2022

We develop finite temperature strong coupling expansions for the SU(N) Hubbard Model in powers of $βt$, $w=\exp{(-βU)}$ and ${1\over βU}$ for arbitrary filling. The expansions are done in the grand canonical ensemble and are most useful at…

Instabilities of spin-one Kitaev Spin Liquid phase in presence of single-ion anisotropies Open

Owen Bradley, Rajiv R. P. Singh · 2021

We study the spin-one Kitaev model on the honeycomb lattice in the presence of single-ion anisotropies. We consider two types of single ion anisotropies: A $D_{111}$ anisotropy which preserves the symmetry between X, Y and Z bonds but viol…

Two Phases Inside the Bose Condensation Dome of Open

Michael O. Flynn, Thomas E. Baker, Siddharth Jindal, Rajiv R. P. Singh · 2021

Recent experimental data on Bose-Einstein condensation of magnons in the spin-gap compound Yb_{2}Si_{2}O_{7} revealed an asymmetric Bose-Einstein condensation dome [G. Hester et al., Phys. Rev. Lett. 123, 027201 (2019)PRLTAO0031-900710.110…

Thermodynamic behavior of modified integer-spin Kitaev models on the honeycomb lattice Open

Owen Bradley, J. Oitmaa, Diptiman Sen, Rajiv R. P. Singh · 2021

We study the thermodynamic behavior of modified spin-S Kitaev models introduced by Baskaran, Sen, and Shankar [Phys. Rev. B 78, 115116 (2008)PRBMDO1098-012110.1103/PhysRevB.78.115116]. These models have the property that for half-odd-integ…

Modelling of 802.11 4-Way Handshake Attacks and Analysis of Security Properties (Dataset) Open

Rajiv R. P. Singh, José Moreira, Tom Chothia, Mark Ryan · 2020

This dataset repository is part of the research paper "Modelling of 802.11 4-Way Handshake Attacks and Analysis of Security Properties". The IEEE 802.11 standard defines a 4-way handshake between a supplicant and an authenticator for secur…

Local entanglement and confinement transitions in the random transverse-field Ising model on the pyrochlore lattice Open

T. Pardini, Anirudha Menon, Stefan P. Hau‐Riege, Rajiv R. P. Singh · 2019

We use numerical linked cluster expansions (NLC) and exact diagonalization to study confinement transitions out of the quantum spin liquid phase in the pyrochlore-lattice Ising antiferromagnet with random transverse fields. We calculate en…

High-field expansion approach to kagome antiferromagnets with Dzyaloshinskii-Moriya interactions Open

Michael O. Flynn, Rajiv R. P. Singh · 2019

We apply linked cluster expansion techniques to study the polarized high-field phase of a spin-half antiferromagnet on the Kagome lattice with Heisenberg and Dzyaloshinskii-Moriya interactions (DMI). We find that the Dirac points of the si…

Robustness of entropy plateaus: A case study of triangular Ising antiferromagnets Open

Owen Bradley, Chunhan Feng, Richard T. Scalettar, Rajiv R. P. Singh · 2019

We present that residual entropy is a key feature associated with emergence in many-body systems. From a variety of frustrated magnets to the onset of spin-charge separation in Hubbard models and fermion-Z₂-flux variables in Kit…

Rapid filling of the spin gap with temperature in the Schwinger-boson mean-field theory of the antiferromagnetic Heisenberg kagome model Open

Jad C. Halimeh, Rajiv R. P. Singh · 2019

Using Schwinger-boson mean-field theory, we calculate the dynamic spin\nstructure factor at low temperatures $0

Griffiths-McCoy singularities in the dilute transverse-field Ising model: A numerical linked cluster expansion study Open

Foster Thompson, Rajiv R. P. Singh · 2019

We use numerical linked cluster expansions (NLCEs) to study the site-diluted transverse-field Ising model on the square lattice at T=0. NLCE with a self-consistent mean field on the boundary of the clusters is used to obtain the ground-sta…

Incipient and well-developed entropy plateaus in spin- Kitaev models Open

J. Oitmaa, Akihisa Koga, Rajiv R. P. Singh · 2018

We present results on entropy and heat-capacity of the spin-S honeycomb-lattice Kitaev models using high-temperature series expansions and thermal pure quantum (TPQ) state methods. We study models with anisotropic couplings $J_z=1\ge J_x=J…

Quantum Spin Ice with Frustrated Transverse Exchange: From a -Flux Phase to a Nematic Quantum Spin Liquid Open

Owen Benton, Ludovic D. C. Jaubert, Rajiv R. P. Singh, J. Oitmaa, Nic Shannon · 2018

Quantum spin ice materials, pyrochlore magnets with competing Ising and transverse exchange interactions, have been widely discussed as candidates for a quantum spin-liquid ground state. Here, motivated by quantum chemical calculations for…

Unconventional pairing symmetry of interacting Dirac fermions on a -flux lattice Open

Huaiming Guo, Ehsan Khatami, Yao Wang, Thomas Devereaux, Rajiv R. P. Singh , et al. · 2018

The pairing symmetry of interacting Dirac fermions on the π-flux lattice is studied with the determinant quantum Monte Carlo and numerical linked-cluster expansion methods. The s∗- (i.e., extended s-) and d-wave pairing symmetries, which a…

Structure factors of the kagome-lattice Heisenberg antiferromagnets at finite temperatures Open

Nicholas E. Sherman, Rajiv R. P. Singh · 2018

We compute the real-space spin correlations and frquency and wave-vector\nresolved dynamic structure factors $S(\\vec q,\\omega)$ for the nearest-neighbor\nKagome-Lattice Heisenberg Antiferromagnet (KLHM) at finite temperatures using\nNume…

Efficient generation of series expansions for Ising spin glasses in a classical or a quantum field Open

Rajiv R. P. Singh, A. P. Young · 2017

We discuss generation of series expansions for Ising spin-glasses with a\nsymmetric $\\pm J$ (i.e. bimodal) distribution on d-dimensional hypercubic\nlattices using linked-cluster methods. Simplifications for the bimodal\ndistribution allo…

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