A5051229626- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Multiferroics and related materials
- 2D Materials and Applications
- Graphene research and applications
- Quantum Dots Synthesis And Properties
- Perovskite Materials and Applications
- Particle physics theoretical and experimental studies
- Iron-based superconductors research
- Chemical and Physical Properties of Materials
- ZnO doping and properties
- Semiconductor materials and devices
- Chalcogenide Semiconductor Thin Films
- Transition Metal Oxide Nanomaterials
- Electron and X-Ray Spectroscopy Techniques
- Neural Networks and Reservoir Computing
- Quantum and electron transport phenomena
- Superconducting Materials and Applications
- Advanced Physical and Chemical Molecular Interactions
- Quantum Chromodynamics and Particle Interactions
- Ferroelectric and Negative Capacitance Devices
Max Planck Institute of Microstructure Physics
2021-2025
KLE Ayur World
2025
S.N. Bose National Centre for Basic Sciences
2023
Martin Luther University Halle-Wittenberg
2022
Hebrew University of Jerusalem
2022
Rutgers, The State University of New Jersey
2017-2021
Indian Institute of Science Bangalore
2013-2021
Syracuse University
2012
Cooper pairs in non-centrosymmetric superconductors can acquire finite centre-of-mass momentum the presence of an external magnetic field. Recent theory predicts that such finite-momentum pairing lead to asymmetric critical current, where a dissipationless supercurrent flow along one direction but not opposite one. Here we report discovery giant Josephson diode effect junctions formed from type-II Dirac semimetal, NiTe2. A distinguishing feature is asymmetry current depends sensitively on...
A combination of measurements using photoelectron spectroscopy and calculations density functional theory (DFT) was applied to compare the detailed electronic structure organolead halide perovskites CH3NH3PbI3 CH3NH3PbBr3. These perovskite materials are used absorb light in mesoscopic planar heterojunction solar cells. The Pb 4f core level is investigated get insight into chemistry two materials. Valence measurments also included showing a shift valence band edges where there higher binding...
We demonstrate the growth of high quality single phase films VO2(A, B, and M) on SrTiO3 substrate by controlling vanadium arrival rate (laser frequency) oxidation V atoms. A diagram has been developed (oxygen pressure versus laser for various phases VO2 their electronic properties are investigated. VO2(A) is insulating VO2(B) semi-metallic, VO2(M) exhibits a metal-insulator transition, corroborated photo-electron spectroscopic studies. The ability to control polymorphs opens up possibility...
The current-induced spin-orbit torque switching of ferromagnets has had huge impact in spintronics. However, short spin-diffusion lengths limit the thickness switchable ferromagnetic layers, thereby limiting their thermal stability. Here, we report a previously unobserved seeded (SSOT) by which current can set magnetic states even thick layers chiral kagome antiferromagnet Mn3Sn. mechanism involves setting orientation antiferromagnetic domains thin region at interface with spin currents...
The generation of spin currents and their application to the manipulation magnetic states is fundamental spintronics. Of particular interest are chiral antiferromagnets that exhibit properties typical ferromagnetic materials even though they have negligible magnetization. Here, we report a robust current with both in-plane out-of-plane polarization in epitaxial thin films antiferromagnet Mn3Sn proximity permalloy layers. By employing temperature-dependent spin-torque resonance, find...
${\mathrm{La}}_{2}{\mathrm{NiMnO}}_{6}$ has been reported to exhibit a paramagnetic ferromagnetic transition with temperature of $\ensuremath{\sim}260$ K. However, most its magnetic properties, such as the saturation magnetization and even temperature, appear vary considerably among different reports. This is possibly because crystallographic structure well extent anti-site disorder (ASD) at Ni/Mn sites are strongly influenced by choice synthesis routes. There diverse reports connecting ASD...
Antiferromagnets with non-collinear spin structures display various properties that make them attractive for spintronic devices. Some of the most interesting examples are an anomalous Hall effect despite negligible magnetization and a unusual polarization directions. However, these effects can only be observed when sample is set predominantly into single antiferromagnetic domain state. This achieved compensated structure perturbed displays weak moments due to canting allows external control....
Transition-metal dichalcogenides (${\mathrm{WTe}}_{2}$ and ${\mathrm{MoTe}}_{2}$) have recently drawn much attention, because of the nonsaturating extremely large magnetoresistance (XMR) observed in these compounds addition to predictions likely type-II Weyl semimetals. Contrary topological insulators or Dirac semimetals where XMR is linearly dependent on field, ${\mathrm{WTe}}_{2}$ ${\mathrm{MoTe}}_{2}$ nonlinearly suggesting an entirely different mechanism. Electron-hole compensation has...
Domain walls (DWs) on magnetic racetracks are at the core of field spintronics, providing a basic element for classical information processing. Here, we show that mobile DWs also provide blueprint large-scale quantum computers. Remarkably, these DW qubits showcase exceptional versatility, serving not only as stationary qubits, but performing role solid-state flying can be shuttled in an ultrafast way. We estimate long-lived because they operated sweet spots to reduce potential noise sources....
A trigonal phase existing only as small patches on chemically exfoliated few layer, thermodynamically stable 1H of MoS2 is believed to influence critically properties based devices. This has been most often attributed the metallic 1T phase. We investigate electronic structure layered systems using spatially resolved (lesser than 120 nm resolution) photoemission spectroscopy and Raman in conjunction with state-of-the-art calculations. On basis these results, we establish that ground state...
Several scientific issues concerning the latest generation read heads for magnetic storage devices, based on CoFeB/MgO/CoFeB tunnel junctions (MTJs) are known to be controversial, including such fundamental questions as behavior and role of B in optimizing physical properties these devices. Quantitatively establishing internal structures several devices with different annealing conditions using hard x-ray photoelectron spectroscopy, we resolve controversies establish that diffusion is...
We investigate [Formula: see text]/[Formula: text] superlattices in which we observe a full electron transfer at the interface from Ir to Ni, triggering massive structural and electronic reconstruction. Through experimental characterization first-principles calculations, determine that large crystal field splitting distorted interfacial octahedra surprisingly dominates over spin-orbit coupling together with Hund's results high-spin (S = 1) configurations on both Ni sites. This demonstrates...
We report on the selective fabrication of high-quality Sr$_2$IrO$_4$ and SrIrO$_3$ epitaxial thin films from a single polycrystalline target by pulsed laser deposition. Using combination X-ray diffraction photoemission spectroscopy characterizations, we discover that within relatively narrow range substrate temperature, oxygen partial pressure plays critical role in cation stoichiometric ratio films, triggers stabilization different Ruddlesden-Popper (RP) phases. Resonant absorption...
Chirality is a ubiquitous and fundamental asymmetry in nature1,2. Recently, the interaction of chiral objects with spin currents has attracted enormous attention from both scientific technological perspectives3-5. Of particular interest current-driven motion topological excitations such as magnetic domain walls three-dimensional structures that could allow for high-density memory-storage devices. Here we use state-of-the-art multiphoton lithography6,7 to create ribbons perform...
Tonsillitis is an inflammatory process of the tonsillar tissues, which are usually infectious. Primary sufferers acute tonsillitis typically school-aged youngsters. The main sources infection include viral pathogens and polymicrobial infections. available conventional treatment approaches alleviate symptoms but have limitations in preventing recurrences. Based on clinical features such as difficulty swallowing, throat pain, swollen erythematous tonsils, disease can be compared to Tundikeri...
Crystalline solids can become band insulators due to fully filled bands, or Mott strong electronic correlations. While theoretically occur in systems with an even number of electrons per unit cell, distinguishing them from experimentally has remained a longstanding challenge. In this work, we present unique momentum-resolved signature dimerized Mott-insulating phase the experimental spectral function Nb3Br8: top highest occupied along out-of-plane direction kz momentum-space separation Δkz =...
Mn-doped SrTiO(3.0), when synthesized free of impurities, is a paramagnetic insulator with interesting dielectric properties. Since delocalized charge carriers are known to promote ferromagnetism in large number systems via diverse mechanisms, we have looked for the possibility any intrinsic, spontaneous magnetization by simultaneous doping Mn ions and electrons into SrTiO3 oxygen vacancies, thereby forming SrTi(1-x)Mn(x)O(3-δ), extent making doped system metallic. We find an absence...
We have revisited the valence band electronic structure of NiO by means hard x-ray photoemission spectroscopy (HAXPES) together with theoretical calculations using both GW method and local density approximation + dynamical mean-field theory (LDA+DMFT) approaches. The effective impurity problem in DMFT is solved through exact diagonalization (ED) method. show that LDA+DMFT conjunction standard fully localized limit (FLL) around mean field (AMF) double-counting alone cannot explain all...
A novel core-shell design for nano-structured electrode materials is introduced realizing cost-effective and high-performance supercapacitors. In the proposed design, thin shell-layers of highly pseudo-capacitive provide platform surface or near-surface-based faradaic non-faradaic reactions together with shortened ion-diffusion path facilitating fast-ion intercalation deintercalation processes. The highly-conducting core serves as highway fast electron transfer toward current collectors,...
We report on Raman and Ni K-edge x-ray absorption investigations of a NiS(2-x)Se(x) (with x = 0.00, 0.50/0.55, 0.60, 1.20) pyrite family. The edge shows systematic shift going from an insulating phase (x 0.00 0.50) to metallic 0.60 1.20). near-edge features show clear evolution with Se doping. extended fine structure data reveal the local doping which mainly governs disorder. also describe decomposition spectra investigate weights various phonon modes using Gaussian Lorentzian profiles....
We present magnetic measurements on ${\mathrm{Nd}}_{2}{\mathrm{NiMnO}}_{6}$ which exhibits a well-known insulating paramagnetic state to an ferromagnetic transition when cooled below 200 K. Beyond this basic fact, there is great deal of diversity in the reported properties and interpretation specific anomalies observed data compound Curie temperature. address specifically two discussed past, namely, spin-glass like behavior some samples near 100 K downturn magnetization with lowering...
We explore the effects of electron doping in lanthanum ferrite, ${\mathrm{LaFeO}}_{3}$ by Mo at Fe sites. Based on magnetic, transport, scanning tunneling spectroscopy, and x-ray photoelectron spectroscopy measurements, we find that large gap, charge-transfer, antiferromagnetic (AFM) insulator becomes a small gap AFM band low doping. With increasing concentration, states, which appear around Fermi level, is broadened become gapless critical 20%. Using combination calculations based density...