A5006973401- Perovskite Materials and Applications
- Ferroelectric and Piezoelectric Materials
- Optical properties and cooling technologies in crystalline materials
- Solid-state spectroscopy and crystallography
- Multiferroics and related materials
- Molecular spectroscopy and chirality
- Acoustic Wave Resonator Technologies
- Advanced NMR Techniques and Applications
- Advanced Condensed Matter Physics
- Electronic and Structural Properties of Oxides
- Inorganic Chemistry and Materials
- Gas Sensing Nanomaterials and Sensors
- Advanced Thermoelectric Materials and Devices
- Semiconductor materials and devices
- Rice Cultivation and Yield Improvement
- Solid State Laser Technologies
- Agricultural Engineering and Mechanization
- Theoretical and Computational Physics
- Soil Mechanics and Vehicle Dynamics
- Glass properties and applications
- Advanced Data Storage Technologies
- Physics of Superconductivity and Magnetism
- ZnO doping and properties
- Machine Learning in Materials Science
- Heusler alloys: electronic and magnetic properties
Duke University
2019-2025
University of Minnesota System
2024
Xi'an University of Science and Technology
2022
Fujian University of Technology
2019
Intrinsically low lattice thermal conductivity ([Formula: see text]) in superionic conductors is of great interest for energy conversion applications thermoelectrics. Yet, the complex atomic dynamics leading to superionicity and ultralow remain poorly understood. Here, we report a comprehensive study diffusion [Formula: text] from energy- momentum-resolved neutron X-ray scattering techniques, combined with first-principles calculations. Our results settle unresolved questions about...
Metal-halide perovskites (MHPs) are attracting considerable interest for optoelectronic applications, with <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><a:msub><a:mi>Cs</a:mi><a:mn>2</a:mn></a:msub><a:msub><a:mrow><a:mi>Ag</a:mi><a:mi>Bi</a:mi><a:mi>Br</a:mi></a:mrow><a:mn>6</a:mn></a:msub></a:math> one of the main contenders among lead-free systems. <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"...
Pronounced anomalies in the SrTiO_{3} dynamical structure factor, S(Q,E), including disappearance of acoustic phonon branches at low temperatures, were uncovered with inelastic neutron scattering (INS) and simulations. The striking effect reflects anharmonic couplings between optic phonons incipient ferroelectric instability near quantum critical point. It is rationalized using a first-principles renormalized approach, pointing to nonlinear Ti-O hybridization causing unusual changes...
The cuprate superconductors are among the most widely studied quantum materials, yet there remain fundamental open questions regarding their electronic properties and role of structural degrees freedom. Recent neutron x-ray scattering measurements uncovered exponential scaling with temperature strength orthorhombic fluctuations in tetragonal phase $La_{2-x}Sr_xCuO_4$ $Tl_2Ba_2CuO_{6+y}$, unusual behavior that closely resembles prior results for emergence superconducting fluctuations, points...
Understanding the complex temporal and spatial correlations of ions in disordered perovskite oxides is critical to rationalize their functional properties. Here, we provide insights into longstanding controversy regarding off-centering transition metal (TM) archetypal ferroelectric alloy KTa <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>−</mml:mo> <mml:mi>x</mml:mi> </mml:mrow>...
NMR is usually performed at magnetic fields of 1 T and above to obtain sufficient sensitivity spectral dispersion identify chemicals based on chemical shifts J couplings. At lower fields, the advent hyperpolarization technologies sensitive low-field detectors can address concerns. However, it remains disputed whether signatures low are for identification. Here, we report an all–electron DFT batch production coupling spectra zero field 6.5 mT over 200 small molecules. We found that...
NMR is usually performed at magnetic fields of 1 T and above to obtain sufficient sensitivity spectral dispersion identify chemicals based on chemical shifts J couplings. At lower fields, the advent hyperpolarization technologies sensitive low-field detectors can address concerns. However, it remains disputed whether signatures low are for identification. Here, we report an all–electron DFT batch production coupling spectra zero field 6.5 mT over 200 small molecules. We found that...
The structure and lattice dynamics of the hybrid improper ferroelectric compound ${\mathrm{Ca}}_{3\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ (for $x=0,0.6,$ 0.9) have been studied with a combination diffraction, inelastic scattering experiments, Raman spectroscopy, calorimetry measurements, as well first-principles simulations. Using neutron scattering, we measured phonon density states (DOS) for $x=0.9$, which revealed strong broadening but little change in energies...
Metal halides perovskites (MHPs) are attracting considerable interest for optoelectronic applications, with Cs$_2$AgBiBr$_6$ one of the main contenders among lead-free systems. crystallizes in a nominally double-perovskite structure, but exhibits soft lattice large atomic fluctuations characteristic MHPs. While crucial to understand electron-phonon and phonon-phonon couplings, spatio-temporal correlations these remain largely unknown. Here, we reveal using comprehensive neutron x-ray...
In this paper, surface-conduction field emission (SCFE) device based on planar-gate triode with in-situ grown ZnO nanorods as the emitter has been fabricated. The are controlled to orientable grow by thermal evaporation a substrate, and their microstructures analyzed through XRD SEM. results show that one-dimensional were rod-shaped, up 200 nm in diameter approximately 15 μm length. They of oriental growth, uniform size perpendicular substrate. With screen-printing, surface conduction is...
The high-temperature structural phase transition of the potential topological material ${\mathrm{NbNiTe}}_{2}$ has been studied in detail. At high temperatures, structure is centrosymmetric with orthorhombic space-group $P\frac{2}{m}\frac{2}{n}\frac{{2}_{1}}{a}(Pmna)$, and distorts at 373 K to a monoclinic $P11\frac{{2}_{1}}{a}(P{112}_{1}/a)$. A small signature specific heat commensurate release entropy are observed transition. low-temperature retains its inversion center symmetries...
In this paper, we present two types of spatially coupled generalized low density parity check (SC-GLDPC) codes to combat burst erasures. Compared with the (SC-LDPC) codes, SC-GLDPC introduce super nodes instead standard single constraints, which is beneficial erasure corrections. To evaluate capability against erasures, evolution algorithm for proposed, can be used compute maximum length consecutive erasures when transmitted over channels. Density analysis results show that correction...