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Spin-Charge-Lattice Coupling across the Charge Density Wave Transition in a Kagome Lattice Antiferromagnet.
Phys Rev Lett
July 2024
Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
Understanding spin and lattice excitations in a metallic magnetic ordered system forms the basis to unveil the magnetic and lattice exchange couplings and their interactions with itinerant electrons. Kagome lattice antiferromagnet FeGe is interesting because it displays a rare charge density wave (CDW) deep inside the antiferromagnetic ordered phase that interacts with the magnetic order. We use neutron scattering to study the evolution of spin and lattice excitations across the CDW transition T_{CDW} in FeGe.
View Article and Find Full Text PDFStructure-dependent spin-polarized electron transport in twin-crystal CuEuO semiconductors.
Phys Chem Chem Phys
March 2024
State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China.
In this work, Eu-doped twin copper oxide (twin CuEuO) was synthesized using the gas-liquid phase chemical deposition method in combination with high-temperature oxidation. The incorporation of Eu ions was affected by their diffusivity and the related charge trapping mechanisms. The twin CuEuO configuration exhibited significant room-temperature ferromagnetism.
View Article and Find Full Text PDFPolarizing Free Electrons in Optical Near Fields.
Phys Rev Lett
May 2023
Institute of Quantum Materials and Physics, Henan Academy of Sciences, Zhengzhou 450046, China.
Polarizing electron beams using light is highly desirable but exceedingly challenging, as the approaches proposed in previous studies using free-space light usually require enormous laser intensities. Here, we propose the use of a transverse electric optical near field, extended on nanostructures, to efficiently polarize an adjacent electron beam by exploiting the strong inelastic electron scattering in phase-matched optical near fields. Intriguingly, the two spin components of an unpolarized incident electron beam-parallel and antiparallel to the electric field-are spin-flipped and inelastically scattered to different energy states, providing an analog of the Stern-Gerlach experiment in the energy dimension.
View Article and Find Full Text PDFA spintronic analog of the Landauer residual resistivity dipole on the surface of a topological insulator containing a line defect.
J Phys Condens Matter
November 2022
Department of Electrical and Computer Engineering, Virginia Commonwealth University, Richmond, VA 23284, United States of America.
The Landauer 'residual resistivity dipole' is a well-known concept in electron transport through a disordered medium. It is formed when a defect/scatterer reflects an impinging electron causing negative charges to build up on one side of the scatterer and positive charges on the other. This charge imbalance results in the formation of a microscopic electric dipole that affects the electrical resistivity of the medium.
View Article and Find Full Text PDFBulk-sensitive spin-resolved resonant electron energy-loss spectroscopy (SR-rEELS): Observation of element- and spin-selective bulk plasmons.
Rev Sci Instrum
September 2021
High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
We have developed spin-resolved resonant electron energy-loss spectroscopy with the primary energy of 0.3-1.5 keV, which corresponds to the core excitations of 2p-3d absorption of transition metals and 3d-4f absorption of rare-earths, with the energy resolution of about 100 meV using a spin-polarized electron source as a GaAs/GaAsP strained superlattice photocathode.
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