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Transition Metal Dichalcogenides: Making Atomic-Level Magnetism Tunable with Light at Room Temperature.
Adv Sci (Weinh)
February 2024
Department of Physics, University of South Florida, Tampa, FL, 33620, USA.
The capacity to manipulate magnetization in 2D dilute magnetic semiconductors (2D-DMSs) using light, specifically in magnetically doped transition metal dichalcogenide (TMD) monolayers (M-doped TX , where M = V, Fe, and Cr; T = W, Mo; X = S, Se, and Te), may lead to innovative applications in spintronics, spin-caloritronics, valleytronics, and quantum computation. This Perspective paper explores the mediation of magnetization by light under ambient conditions in 2D-TMD DMSs and heterostructures. By combining magneto-LC resonance (MLCR) experiments with density functional theory (DFT) calculations, we show that the magnetization can be enhanced using light in V-doped TMD monolayers (e.
View Article and Find Full Text PDFCrossed-beam slowing to enhance narrow-line ytterbium magneto-optic traps.
Rev Sci Instrum
September 2020
Department of Physics, University of Washington, Seattle, Washington 98195, USA.
We demonstrate a method to enhance the atom loading rate of a ytterbium (Yb) magneto-optic trap (MOT) operating on the 556 nm S → P intercombination transition (narrow linewidth Γ = 2π × 182 kHz). Following traditional Zeeman slowing of an atomic beam near the 399 nm S → P transition (broad linewidth Γ = 2π × 29 MHz), two laser beams in a crossed-beam geometry, frequency tuned near the same transition, provide additional slowing immediately prior to the MOT. Using this technique, we observe an improvement by a factor of 6 in the atom loading rate of a narrow-line Yb MOT.
View Article and Find Full Text PDFTopology-Dependent Brownian Gyromotion of a Single Skyrmion.
Phys Rev Lett
July 2020
State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China.
Noninteracting particles exhibiting Brownian motion have been observed in many occasions of sciences, such as molecules suspended in liquids, optically trapped microbeads, and spin textures in magnetic materials. In particular, a detailed examination of Brownian motion of spin textures is important for designing thermally stable spintronic devices, which motivates the present study. In this Letter, through using temporally and spatially resolved polar magneto-optic Kerr effect microscopy, we have experimentally observed the thermal fluctuation-induced random walk of a single isolated Néel-type magnetic skyrmion in an interfacially asymmetric Ta/CoFeB/TaO_{x} multilayer.
View Article and Find Full Text PDFIn order to suppress the effects of carrier and high-order sidebands on the coherent population trapping (CPT) signal, a scheme of interaction between an elliptically polarized beam and alkali atoms using the magneto-optic rotation detection is examined. By canceling the spin-polarized dark state in the CPT state preparation, a CPT resonance signal with a contrast of 32.5% is obtained.
View Article and Find Full Text PDFDiffraction and scatter effects are two big challenges that make the magnetization induced by a light beam endure a finite propagation distance and vulnerable to the defect of magneto-optic film. Here we propose a method to overcome both challenges by creating an ultralong non-diffracting (UND) magnetization light beam with multiple energy oscillations. By simply increasing the number of energy oscillations using the optical pen, the magnetization light beam can propagate over an ultralong distance without significant divergence.
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