A5012568553- 2D Materials and Applications
- Magnetic properties of thin films
- Heusler alloys: electronic and magnetic properties
- Iron-based superconductors research
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Laser-induced spectroscopy and plasma
- Multiferroics and related materials
- Organic and Molecular Conductors Research
- Laser-Ablation Synthesis of Nanoparticles
- Magnetic Properties and Applications
- Superconducting and THz Device Technology
- Advanced Thermodynamic Systems and Engines
- Advanced Condensed Matter Physics
- Electronic and Structural Properties of Oxides
- Laser-Plasma Interactions and Diagnostics
- Electrohydrodynamics and Fluid Dynamics
- Advanced Optical Imaging Technologies
- Magneto-Optical Properties and Applications
- Optical Coherence Tomography Applications
- Magnetic and transport properties of perovskites and related materials
- Chemical and Physical Properties in Aqueous Solutions
- African Sexualities and LGBTQ+ Issues
- Photonic Crystal and Fiber Optics
- Orbital Angular Momentum in Optics
Clemson University
2023-2024
Goddard Space Flight Center
2024
Lawrence Berkeley National Laboratory
2023-2024
University of Tennessee at Knoxville
2016-2022
University of Missouri–Kansas City
2016
Tribhuvan University
2012
Thin van der Waals (vdW) layered magnetic materials hold the possibility of realizing vdW heterostructures with new functionalities. Here, we report on realization and investigation tunneling spin valves based consisting an atomically thin hBN layer acting as tunnel barrier two exfoliated Fe3GeTe2 crystals ferromagnetic electrodes. Low-temperature anomalous Hall effect measurements show that are metallic ferromagnets easy axis perpendicular to layers a very sharp magnetization switching at...
In this work, the magnetism of single crystal Cr$_{1/3}$NbS$_{2}$, which exhibits chiral magnetic soliton lattice (CSL) state, is investigated. The magnetization displays strong anisotropy when field applied perpendicularly and parallel to $c$-axis in low region ($H<H_{S}$, $H_{S}$ saturation field). critical exponents Cr$_{1/3}$NbS$_{2}$ are obtained as $\beta=$ 0.370(4), $\gamma=$ 1.380(2), $\delta=$ 4.853(6), close theoretical prediction three-dimensional Heisenberg model. Based on...
The electronic structure of the chiral helimagnet $\mathrm{C}{\mathrm{r}}_{1/3}\mathrm{Nb}{\mathrm{S}}_{2}$ has been studied with core level and angle-resolved photoemission spectroscopy (ARPES). Intercalated Cr atoms are found to be effective in donating electrons $\mathrm{Nb}{\mathrm{S}}_{2}$ layers but also cause significant modifications host material. In particular, data provide evidence that a description on basis simple rigid band picture is untenable. reveal substantial...
A pulsed laser beam from an excimer was used to ablate a solid tin target immersed in water the presence of external electric field. High fluence resulted formation overheated melt at surface resulting homogeneous nucleation and phase explosion. The ablation products were studied with transmission electron microscopy. It found that no field size distribution particles has peaks ∼1 ∼10 nm externally applied fields decrease particle size. model based on Rayleigh instability polarization...
The Dzyaloshinskii-Moriya (DM) interaction is present in the transition metal dichalcogenides (TMDC) magnets of form ${M}_{1/3}T{\mathrm{S}}_{2}$ ($M=3d$ metal, $T\ensuremath{\in}{\mathrm{Nb},\mathrm{Ta}}$), given that intercalants $M$ $\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}$ superlattices within structure parent materials $T{\mathrm{S}}_{2}$ and break centrosymmetry. Competition between DM ferromagnetic exchange interactions has been shown to stabilize a topological defect known...
We combine Raman scattering spectroscopy and lattice dynamics calculations to reveal the fundamental excitations of intercalated metal monolayers in FexTaS2 (x = 1/4, 1/3) family materials. Both in- out-of-plane modes are identified, each which has trends that depend upon metal–metal distance, size van der Waals gap, metal-to-chalcogenide slab mass ratio. test these against response similar systems, including Cr-intercalated NbS2 RbFe(SO4)2, demonstrate monolayer both coherent tunable....
The structural properties of LaCu_{6-x}Au_{x} are studied using neutron diffraction, x-ray and heat capacity measurements. continuous orthorhombic-monoclinic phase transition in LaCu_{6} is suppressed linearly with Au substitution until a complete suppression the occurs at critical composition x_{c}=0.3. Heat measurements low temperatures indicate residual instability x_{c}. ferroelastic nature, density functional theory calculations showing negligible coupling to electronic states near...
The EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) is a balloon-borne telescope designed to survey star formation over cosmological time scales using intensity mapping in the 420 - 540 GHz frequency range. EXCLAIM uses fully cryogenic coupled six on-chip spectrometers featuring kinetic inductance detectors (KIDs) achieve high sensitivity, allowing fast integration dark atmospheric windows. receiver cooled $\approx$ 1.7 K by immersion superfluid helium bath and enclosed...
Hybrid superconductor–semiconductor materials systems are promising candidates for quantum computing applications. Their integration into superconducting electronics has enabled on-demand voltage tunability at millikelvin temperatures. Ge wells have been among the semiconducting platforms interfaced with Al to realize tunable Josephson junctions. Here, we explore Nb as a material in direct contact channels by focusing on solid-state reactions Nb/Ge interfaces. We employ evaporation cryogenic...
We have successfully synthesized niobium monophosphide and tantalum crystals by a chemical vapor transport technique. report resistivity vs. temperature of both materials in the range from 2 K to 300 K. also performed electronic structure calculations present band density states these two compounds. The show that compounds are semimetals, as their conduction valence bands overlap near Fermi energy.
Chiral helimagnetic materials have recently attracted much attention for spintronic applications due to their long-range helical magnetic order, topological spin textures, and potential hosting skyrmions. Their robust texture would provide a new concept of ultrafast memory if it can be controlled by an optical pulse. Using time-resolved magneto-optical Kerr spectroscopy, we show that magnetism in the single-crystalline chiral helimagnet ${\text{Cr}}_{1/3}{\text{NbS}}_{2}$ induced At low...
Abstract The chiral helimagnet Cr 1/3 NbS 2 hosts exotic spin textures, whose influence on the magneto-transport properties make this material an ideal candidate for future spintronic applications. To date, interplay between macroscopic magnetic and transport degrees of freedom is believed to result from a reduction in carrier scattering following order. Here, we present electronic structure measurements across helimagnetic transition temperature T C that challenges view. We show Fermi...
Precise measurements on the conductivity of Sodium nitrate in methanol-water mixed solvent media containing 0.10, 0.20, 0.30 and 0.40 volume fractions methanol at 308.15, 318.15 323.15 K are reported. The concentrations were varied from (0.001 to 0.15) mol.L-1. results showed a sharp increase with increasing electrolyte concentration. Also, increases temperature whereas decreases amount methanol.DOI: http://dx.doi.org/10.3126/njst.v12i0.6498 Nepal Journal Science Technology 12 (2011) 187-92
Hybrid Superconductor-Semiconductor (S-Sm) materials systems are promising candidates for quantum computing applications. Their integration into superconducting electronics has enabled on-demand voltage tunability at millikelvin temperatures. Ge wells (Ge QWs) have been among the semiconducting platforms interfaced with Al to realize tunable Josephson junctions. Here, we explore Nb as a material in direct contact channels by focusing on solid-state reactions Nb/Ge interfaces. We employ...
We theoretically and experimentally show coherent pulse stacking (CPS) can accommodate tens-of-fs durations has negligible fidelity degradation with increased bandwidth. Simulations prove large number of pulses be stacked high pre-pulse contrast. In an experiment, nine spectrally broadened fiber amplified are using four cascaded cavities. CPS different spectral bandwidths, up to 75 nm base-to-base (<50 fs transform-limited duration), tested, showing due This work provides a path towards...
An amendment to this paper has been published and can be accessed via a link at the top of paper.
We theoretically prove coherent pulse stacking can accommodate tens-of-fs lengths when large number of pulses. Experimental validation shows high-efficiency nine, 50fs bandwidth pulses with four Gires-Tournois Interferometric (GTI) cavities.