A5057694370- Quantum and electron transport phenomena
- Semiconductor Quantum Structures and Devices
- Advanced Condensed Matter Physics
- Advanced Chemical Physics Studies
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Quantum, superfluid, helium dynamics
- 2D Materials and Applications
- Atomic and Molecular Physics
- Graphene research and applications
- Advanced Physical and Chemical Molecular Interactions
- Surface and Thin Film Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Chalcogenide Semiconductor Thin Films
- Magnetic confinement fusion research
- Radioactive Decay and Measurement Techniques
- Molecular Spectroscopy and Structure
- Quantum-Dot Cellular Automata
- Particle accelerators and beam dynamics
- Spectroscopy and Quantum Chemical Studies
- Ancient Egypt and Archaeology
- Superconducting Materials and Applications
- Magnetic properties of thin films
- Advanced Thermodynamics and Statistical Mechanics
- Advanced NMR Techniques and Applications
Asia Pacific Center for Theoretical Physics
2022-2024
Nicolaus Copernicus University
2024
Pohang University of Science and Technology
2022-2023
University of Delhi
2016-2022
Kagome metals have emerged as pivotal materials in condensed matter physics due to their unique geometric arrangement and intriguing electronic properties. Understanding the origin of magnetism these materials, particularly iron rich Fe-Sn binary compounds like Fe$_3$Sn, holds a significant importance, they represent potential candidates for permanent magnets with high Curie temperature strong magnetic anisotropy. In present study, we employ density-functional theory dynamical mean-field...
Electronic structures of heavy-hole trions and He-isoelectronic ions show dependence on transitions among two-electron bound states constituted hydrogenic orbitals for which Coulomb (exchange) interaction causes nontrivial secular divergence to Schrödinger equation (SE). between a pair electrons triggers nonadiabatic due conical intersections larger vibrational amplitudes nuclei. Therefore, existing state-of-art theories ubiquitously urge analytical integrals multipoles electrostatic Green's...
The V-based kagome systems $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ ($A=\mathrm{Cs}$, Rb, and K) are unique by virtue of the intricate interplay nontrivial electronic structure, topology, intriguing fermiology, rendering them to be a playground many mutually dependent exotic phases like charge-order superconductivity. Despite numerous recent studies, interconnection magnetism other complex collective phenomena in these has yet not arrived at any conclusion. Using first-principles tools, we...
We have investigated the dynamical magnetic properties of V-based kagome stibnite compounds by combining ab initio-extracted parameters a spin-Hamiltonian, like inter-site exchange parameters, magnetocrystalline anisotropy and site projected moments, with full-fledged simulations atomistic spin- dynamics. Our calculations reveal that, in addition to ferromagnetic order along [001] direction, system hosts complex landscape configurations comprised commensurate incommensurate spin spirals...
Excitons in parabolically confined planar quantum dots with a transverse magnetic field have been studied various model systems. The correlations between e–h, e–e, and h–h incorporated terms of exact, simply elegant, absolutely terminating finite summed Lauricella functions which eliminate the secular divergence problem pave way for comprehensive understanding certain exotic phenomena two-dimensional regular irregular dots. A simple yet highly accurate exact variational wave function...
Two-dimensional superlattices, TMDCs and graphene family exhibit strong coulomb correlations among e–e, e–h, electron-phonon etc. As the number of electron increases, confining gate voltage transverse magnetic field are superseded by increasing interactions (N(N−1)/2 factors) that composes non-trivial Schrödinger equations. Representing such equations in Whittaker-M functions yields a modest alternate formalism, accommodates integrals (exchange) single-summed, finite exact Lauricella via...
(2020). Full-scale analytical perturbation calculation of He-isoelectronic series with Hydrogenic bound states via Green's function expansion (monopole) Coulomb interactions. Molecular Physics: Vol. 118, MQM 2019, e1770881.
As the density of electrons (N=2, 3, 4, 5, 6, 7, 8,.) increases, complexity arises due to coulomb interactions, inclusion fermionic exchange symmetry and anisotropy. Consequently, Schrödinger equations anisotropic quantum dots become non-trivial. Recasting such non-relativistic into Whittaker-M basis functions unifies (exchange) correlation antisymmetric nature in two-centered integrals exact, finite, single-summed, terminated simplest Lauricella (F2) via multi-pole expansion subsequent...
Acute Coulomb interaction of the two-dimensional systems has drawn special attention due to its unusual logarithmic Green function expansion. As number electrons (N) increases, Pauli Exclusion principle emerges inevitably with rapidly growing electronic correlations. Quantum dot, Transition metal dichalcogenides (TMDC) and Carbon nanotube (CNT) families 2-D anisotropic mesoscopic are rich habitats electrons. Schrödinger equations such in electrical confinement transverse magnetic field can...
Abstract Employing H-like spin-orbitals (SOs) in electronic structure theory is a long-awaited quantum problemas the analytical integral of Coulomb interaction very difficult to solve for one-center manyelectron(1c-ne) system. He-isoelectronic ions become benchmark. Complexity grows fast forPeriod-II s- and p-block elements with increasing number electrons. Moreover, Hartree-FockSelf-Consistent Field (SCF) post Hartree-Fock SCF theories generally make use closed-shell,restricted unrestricted...
Abstract Energetics of two‐center two‐electron (2 c –2 e ) systems carry challenges in theoretical understanding Schrödinger equation (SE) for well‐known divergence Coulomb interactions and nuclear separation ( R modified H ‐like AOs, Slater type orbitals (STOs), Gaussian (GTOs), B‐spline, Sturmian function etc . employed to VBT MOT. Certain elegant computational analytical techniques were developed STO, GTO other square integrable basis set within Born‐Oppenheimer (BO) approximation. STOs...
Topological insulators doped with magnetic impurities has become a promising candidate for Quantum Anomalous Hall Effect (QAHE) in the dilute doping limit. The crucial factor realizing QAHE these systems is spontaneous Ferromagnetic (FM) ordering between atoms. Hence, understanding exchange interaction atoms becomes essential. In this work, we use Density functional theory (DFT) and Magnetic force theorem (MFT) to calculate (V, Cr, Mn, Fe) host Bi2Se3. Through an orbital decomposition of...
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In this paper, we employ electronic structure theory to investigate the nature of exchange coupling in transition metal doped <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>Bi</a:mi><a:mn>2</a:mn></a:msub><a:msub><a:mi>Se</a:mi><a:mn>3</a:mn></a:msub></a:mrow></a:math>. We focus on V, Cr, Mn, and Fe, which have been under scrutiny for realization quantum anomalous Hall effect. For simplicity, model doping process as happening inside a single layer Bi within...
We have investigated the dynamical magnetic properties of V-based kagome stibnite compounds by combining ab-initio calculated parameters a spin Hamiltonian like inter-site exchange parameters, magnetocrystalline anisotropy and site projected moments, with full-fledged simulations atomistic spin-dynamics. Our calculations reveal that in addition to ferromagnetic order along [001] direction, system hosts complex landscape configurations comprised commensurate incommensurate spin-spirals [010]...
The V-based kagome systems AV3Sb5 (A = Cs, Rb and K) are unique by virtue of the intricate interplay non-trivial electronic structure, topology intriguing fermiology, rendering them to be a playground many mutually dependent exotic phases like charge-order superconductivity. Despite numerous recent studies, interconnection magnetism other complex collective phenomena in these has yet not arrived at any conclusion. Using first-principles tools, we demonstrate that their structures,...