A5073741720- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Rare-earth and actinide compounds
- Iron-based superconductors research
- Multiferroics and related materials
- Topological Materials and Phenomena
- Nuclear Physics and Applications
- Theoretical and Computational Physics
- High-pressure geophysics and materials
- Magnetic properties of thin films
- Atomic and Subatomic Physics Research
- Magnetism in coordination complexes
- Nuclear materials and radiation effects
- Magnetic Properties of Alloys
- Crystal Structures and Properties
- 2D Materials and Applications
- Heusler alloys: electronic and magnetic properties
- Organic and Molecular Conductors Research
- Inorganic Fluorides and Related Compounds
- Perovskite Materials and Applications
- Quantum and electron transport phenomena
- X-ray Diffraction in Crystallography
- Inorganic Chemistry and Materials
- Advanced Thermoelectric Materials and Devices
Atom Computing (United States)
2023-2024
Parker Hannifin (United States)
2024
Oak Ridge National Laboratory
2015-2024
North Carolina State University
2024
North Central State College
2024
Government of the United States of America
2023
Rutgers Sexual and Reproductive Health and Rights
2022
St. Matthew's University
2022
Quantum Science Center
2012-2020
Defence Academy of the United Kingdom
2020
Sighting of magnetic Majorana fermions? Quantum spin liquids—materials whose spins do not settle into order even at absolute zero temperature—have long captured the interest physicists. A particularly lofty goal is finding a material that can be described by so-called Kitaev model, network on honeycomb lattice harbors fermions as its excitations. Banerjee et al. present comprehensive inelastic neutron scattering study single crystals α-RuCl 3 , which has been predicted to host liquid. The...
Water-soluble, Au-coated magnetic Fe oxide nanoparticles with diameters ∼60 nm were synthesized by the reduction of Au3+ onto surfaces ∼9 diameter particles consisting either γ-Fe2O3 or partially oxidized Fe3O4 via iterative hydroxylamine seeding. The morphology and optical properties core/shell are dependent on quantity deposited Au, while remain largely independent Au addition. exhibit a surface plasmon resonance peak that blue-shifts from 570 to 525 increasing deposition. SQUID...
In two dimensional honeycomb ferromagnets, bosonic magnon quasiparticles (spin waves) may either behave as massless Dirac fermions or form topologically protected edge states. The key ingredient defining their nature is the next-nearest neighbor Dzyaloshinskii-Moriya (DM) interaction that breaks inversion symmetry of lattice and discriminates chirality associated spin-wave excitations. Using inelastic neutron scattering, we find spin waves insulating ferromagnet CrI$_3$ ($T_C=61$ K) have...
The wide angular-range chopper spectrometer ARCS at the Spallation Neutron Source (SNS) is optimized to provide a high neutron flux sample position with large solid angle of detector coverage. instrument incorporates modern instrumentation, such as an elliptically focused guide, speed magnetic bearing choppers, and massive array (3)He linear sensitive detectors. Novel features include use gate valve between vacuum chambers placement detectors within vacuum, both which window-free final...
Recently, Co-based honeycomb magnets have been proposed as promising candidate materials to host the Kitaev spin liquid state. One of front-runners is BaCo$_2$(AsO$_4$)$_2$ (BCAO), where it was suggested that exchange processes between Co$^{2+}$ ions via surrounding edge-sharing oxygen octahedra could give rise bond-dependent interactions. In this work, we present and analyze comprehensive inelastic neutron scattering studies BCAO with fields in plane. Combining constraints from magnon...
Assembling and maintaining large arrays of individually addressable atoms is a key requirement for continued scaling neutral-atom-based quantum computers simulators. In this work, we demonstrate new paradigm assembly atomic arrays, based on synergistic combination optical tweezers cavity-enhanced lattices, the incremental filling target array from repetitively filled reservoir. protocol, provide microscopic rearrangement atoms, while lattices enable creation numbers traps with sufficient...
Inelastic neutron scattering measurements on single crystals of superconducting BaFe1.84Co0.16As2 reveal a magnetic excitation located at wave vectors (1/2 1/2 L) in tetragonal notation. On cooling below T_{C}, clear resonance peak is observed this vector with an energy 8.6(0.5) meV, corresponding to 4.5(0.3) k_{B}T_{C}. This good agreement the canonical value 5 k_{B}T_{C} cuprates. The spectrum shows strong dispersion plane but very weak along c axis, indicating that fluctuations are two...
Equimolar FeCoCrNi alloys have been the topic of recent research as “high-entropy alloys,” where name is derived from high configurational entropy mixing for a random solid solution. Despite their name, no systematic study ordering in this alloy system has performed to date. Here, we present results anomalous x-ray scattering and neutron on quenched annealed samples. An FeNi3 was prepared same manner act control. Evidence long-range chemical clearly observed sample both experimental...
Intrinsic, two-dimensional ferromagnetic semiconductors are an important class of materials for overcoming the limitations dilute magnetic spintronics applications. CrSiTe$_3$ is a particularly interesting member this class, since it can likely be exfoliated down to single layers, where T$_C$ predicted increase dramatically. Establishing nature magnetism in bulk necessary precursor understanding behavior thin film samples and possible applications material. In work, we use elastic inelastic...
The metal-insulator transition (MIT) is one of the most dramatic manifestations electron correlations in materials. Various mechanisms producing MITs have been extensively considered, including Mott (electron localization via Coulomb repulsion), Anderson (localization disorder), and Peierls distortion a periodic one-dimensional lattice) mechanisms. One additional route to MIT proposed by Slater, which long-range magnetic order three dimensional system drives MIT, has received relatively...
The Spallation Neutron Source at Oak Ridge National Laboratory now hosts four direct geometry time-of-flight chopper spectrometers. These instruments cover a range of wave-vector and energy transfer space with varying degrees neutron flux resolution. regions reciprocal available to measure these are not exclusive overlap significantly. We present comparison the capabilities this instrumentation, conducted by data mining instrument usage histories, specific scanning regimes. In addition, one...
Neutron scattering measurements on the pyrochlore magnet Ce2Zr2O7 reveal an unusual crystal field splitting of its lowest J=5/2 multiplet, such that ground-state doublet is composed mJ=±3/2, giving these doublets a dipole-octupole (DO) character with local Ising anisotropy. Its magnetic susceptibility shows weak antiferromagnetic correlations θCW=−0.4(2) K, leading to naive expectation all-in, all-out ordered state at low temperatures. Instead, our low-energy inelastic neutron show dynamic...
Using inelastic neutron scattering, we map a 14 meV coherent resonant mode in the topological Kondo insulator ${\mathrm{SmB}}_{6}$ and describe its relation to low energy insulating band structure. The intensity is confined $X$ $R$ high symmetry points, repeating outside first Brillouin zone dispersing less than 2 meV, with $5d$-like magnetic form factor. We present slave-boson treatment of Anderson Hamiltonian third neighbor dominated hybridized This approach produces spin exciton below...
Abstract The broken symmetry in the atomic-scale ordering of glassy versus crystalline solids leads to a daunting challenge provide suitable metrics for describing order within disorder, especially on length scales beyond nearest neighbor that are characterized by rich structural complexity. Here, we address this silica, canonical network-forming glass, using hot cold compression (i) systematically increase after densification and (ii) prepare two glasses with same high-density but...
We use neutron scattering to show that ferromagnetic (FM) phase transition in the two-dimensional (2D) honeycomb lattice ${\mathrm{CrI}}_{3}$ is a weakly first order and controlled by spin-orbit coupling (SOC) induced magnetic anisotropy, instead of exchange as conventional ferromagnet. With increasing temperature, magnitude seen spin gap at Brillouin zone center, decreases power law fashion vanishes ${T}_{C}$, while in-plane $c$-axis spin-wave stiffnesses associated with couplings remain...
Experiments show that magnons in CoTiO${}_{3}$ have a similar energy-momentum relation to electrons graphene, setting up as good system which study interactions between so-called Dirac bosons.
The search for topological spin excitations in recently discovered two-dimensional (2D) van der Waals (vdW) magnetic materials is important because of their potential applications dissipationless spintronics. In the 2D vdW ferromagnetic (FM) honeycomb lattice CrI3 (TC=61 K), acoustic and optical waves are found to be separated by a gap at Dirac points. presence such signature if it arises from next-nearest-neighbor (NNN) Dzyaloshinskii-Moriya (DM) or bond-angle-dependent Kitaev interactions...
Measurement-based quantum error correction relies on the ability to determine state of a subset qubits (ancillas) within processor without revealing or disturbing remaining qubits. Among neutral-atom-based platforms, scalable, high-fidelity approach midcircuit measurement that retains ancilla in suitable for future operations has not yet been demonstrated. In this work, we perform maging using narrow-linewidth transition an array tweezer-confined Yb171 atoms demonstrate nondestructive...