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Journal articles on the topic 'Ultrafast current'

Author: Grafiati

Published: 22 February 2025

Last updated: 31 July 2025

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1

Lu Wen-Tian, Yao Chun-Wei, YAN Zhi, and YUAN Zhe. "Ultrafast Spin Dynamics Research on Laser-Induced Spin Valve Structures." Acta Physica Sinica 74, no. 6 (2025): 0. https://doi.org/10.7498/aps.74.20241744.

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The discovery of ultrafast demagnetization has introduced a new approach for generating ultrafast spin currents using an ultrashort laser, potentially enabling faster manipulation of material magnetism. This has sparked research into the transport mechanisms of ultrafast spin currents. However, the underlying processes remain poorly understood, particularly the factors influencing interlayer spin transfer. This study employs a superdiffusive spin transport model to investigate the ultrafast spin transport mechanisms in the Ni/Ru/Fe spin valve system, with a particular focus on how interlayer s

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Sotome, M., M. Nakamura, J. Fujioka, et al. "Spectral dynamics of shift current in ferroelectric semiconductor SbSI." Proceedings of the National Academy of Sciences 116, no. 6 (2019): 1929–33. http://dx.doi.org/10.1073/pnas.1802427116.

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Photoexcitation in solids brings about transitions of electrons/holes between different electronic bands. If the solid lacks an inversion symmetry, these electronic transitions support spontaneous photocurrent due to the geometric phase of the constituting electronic bands: the Berry connection. This photocurrent, termed shift current, is expected to emerge on the timescale of primary photoexcitation process. We observe ultrafast evolution of the shift current in a prototypical ferroelectric semiconductor antimony sulfur iodide (SbSI) by detecting emitted terahertz electromagnetic waves. By sw

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Kiemle, Jonas, Philipp Zimmermann, Alexander W. Holleitner, and Christoph Kastl. "Light-field and spin-orbit-driven currents in van der Waals materials." Nanophotonics 9, no. 9 (2020): 2693–708. http://dx.doi.org/10.1515/nanoph-2020-0226.

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AbstractThis review aims to provide an overview over recent developments of light-driven currents with a focus on their application to layered van der Waals materials. In topological and spin-orbit dominated van der Waals materials helicity-driven and light-field-driven currents are relevant for nanophotonic applications from ultrafast detectors to on-chip current generators. The photon helicity allows addressing chiral and non-trivial surface states in topological systems, but also the valley degree of freedom in two-dimensional van der Waals materials. The underlying spin-orbit interactions

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Cottrell, W. J., T. G. Ference, and K. A. Puzey. "Improved magnetooptic modulator for ultrafast current pulses." IEEE Photonics Technology Letters 14, no. 5 (2002): 624–26. http://dx.doi.org/10.1109/68.998705.

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5

Lian, Meng, and Jie Wu. "Ultrafast micropumping by biased alternating current electrokinetics." Applied Physics Letters 94, no. 6 (2009): 064101. http://dx.doi.org/10.1063/1.3080681.

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6

Kim, Un-Tae, Myeong-Hun Jo, and Hyo-Jin Ahn. "Microgrid-Patterned Ni Foams as Current Collectors for Ultrafast Energy Storage Devices." Metals 14, no. 3 (2024): 354. http://dx.doi.org/10.3390/met14030354.

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Current research is focused on developing active materials through surface functionalization, porosity, composites, and doping for ultrafast electric double layer capacitors (EDLCs). In this study, deviating from existing strategies focused on active materials, we designed tunable 3D microgrid-patterned (MP) surface morphologies on Ni foams used as current collectors using SUS meshes as rigid stamps during roll pressing. The surface geometries of the MP-Ni foams were controlled to standard mesh scales of 24, 40, and 60 (denoted as 24MP-Ni, 40MP-Ni, and 60MP-Ni, respectively). The three MP-Ni s

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Sobacchi, Emanuele, Tsvi Piran, and Luca Comisso. "Ultrafast Variability in AGN Jets: Intermittency and Lighthouse Effect." Astrophysical Journal Letters 946, no. 2 (2023): L51. http://dx.doi.org/10.3847/2041-8213/acc84d.

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Abstract Gamma-ray flares from active galactic nuclei (AGNs) show substantial variability on ultrafast timescales (i.e., shorter than the light-crossing time of the AGN’s supermassive black hole). We propose that ultrafast variability is a by-product of the turbulent dissipation of the jet Poynting flux. Due to the intermittency of the turbulent cascade, the dissipation is concentrated in a set of reconnecting current sheets. Electrons energized by reconnection have a strong pitch-angle anisotropy, i.e., their velocity is nearly aligned with the guide magnetic field. Then each current sheet pr

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Zymmer, K., and P. Mazurek. "Comparative investigation of SiC and Si power electronic devices operating at high switching frequency." Bulletin of the Polish Academy of Sciences: Technical Sciences 59, no. 4 (2011): 555–59. http://dx.doi.org/10.2478/v10175-011-0068-0.

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Comparative investigation of SiC and Si power electronic devices operating at high switching frequencyThe paper presents results of measurements of the reverse recovery current and dynamic forward voltage of the silicon carbide (SiC) Schottky diodes operating at a 500 A/μs current slope. These data were compared with the corresponding parameters determined for ultrafast silicon (Si) diodes. Results of power losses measurement in SiC Schottky diodes operating at switching frequency range of (10-200) kHz are presented and compared with corresponding data of ultrafast Si diodes. Also, results of

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9

Elezzabi, A. Y., and M. R. Freeman. "Ultrafast magneto‐optic sampling of picosecond current pulses." Applied Physics Letters 68, no. 25 (1996): 3546–48. http://dx.doi.org/10.1063/1.116632.

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10

Wagner, Ronald S., Jeffrey M. Bradley, Carl J. Maggiore, Jerome G. Beery, and Robert B. Hammond. "An Approach to Measure Ultrafast-Funneling-Current Transients." IEEE Transactions on Nuclear Science 33, no. 6 (1986): 1651–56. http://dx.doi.org/10.1109/tns.1986.4334658.

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11

Prechtel, L., S. Manus, D. Schuh, W. Wegscheider, and A. W. Holleitner. "Spatially resolved ultrafast transport current in GaAs photoswitches." Applied Physics Letters 96, no. 26 (2010): 261110. http://dx.doi.org/10.1063/1.3458819.

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12

Li, Zhangshun, Yexin Jiang, Zuanming Jin, et al. "Terahertz Emission Spectroscopy of Ultrafast Coupled Spin and Charge Dynamics in Nanometer Ferromagnetic Heterostructures." Nanomaterials 12, no. 23 (2022): 4267. http://dx.doi.org/10.3390/nano12234267.

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Due to its high sensitivity and because it does not rely on the magneto-optical response, terahertz (THz) emission spectroscopy has been used as a powerful time-resolved tool for investigating ultrafast demagnetization and spin current dynamics in nanometer-thick ferromagnetic (FM)/heavy metal (HM) heterostructures. Here, by changing the order of the conductive HM coating on the FM nanometer film, the dominant electric dipole contribution to the laser-induced THz radiation can be unraveled from the ultrafast magnetic dipole. Furthermore, to take charge equilibration into account, we separate t

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13

Khakurel, Krishna Prasad, Gabriel Žoldák, Borislav Angelov, and Jakob Andreasson. "On the feasibility of time-resolved X-ray powder diffraction of macromolecules using laser-driven ultrafast X-ray sources." Journal of Applied Crystallography 57, no. 4 (2024): 1205–11. http://dx.doi.org/10.1107/s1600576724005028.

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With the emergence of ultrafast X-ray sources, interest in following fast processes in small molecules and macromolecules has increased. Most of the current research into ultrafast structural dynamics of macromolecules uses X-ray free-electron lasers. In parallel, small-scale laboratory-based laser-driven ultrafast X-ray sources are emerging. Continuous development of these sources is underway, and as a result many exciting applications are being reported. However, because of their low flux, such sources are not commonly used to study the structural dynamics of macromolecules. This article exa

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14

Feng, Jiecai, Junzhe Wang, Hongfei Liu, et al. "A Review of an Investigation of the Ultrafast Laser Processing of Brittle and Hard Materials." Materials 17, no. 15 (2024): 3657. http://dx.doi.org/10.3390/ma17153657.

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Ultrafast laser technology has moved from ultrafast to ultra-strong due to the development of chirped pulse amplification technology. Ultrafast laser technology, such as femtosecond lasers and picosecond lasers, has quickly become a flexible tool for processing brittle and hard materials and complex micro-components, which are widely used in and developed for medical, aerospace, semiconductor applications and so on. However, the mechanisms of the interaction between an ultrafast laser and brittle and hard materials are still unclear. Meanwhile, the ultrafast laser processing of these materials

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15

Fedorov, Ivan I., Sergey A. Protasov, Irina A. Tarasova, and Mikhail V. Gorshkov. "Ultrafast Proteomics." Biochemistry (Moscow) 89, no. 8 (2024): 1349–61. http://dx.doi.org/10.1134/s0006297924080017.

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Abstract Current stage of proteomic research in the field of biology, medicine, development of new drugs, population screening, or personalized approaches to therapy dictates the need to analyze large sets of samples within the reasonable experimental time. Until recently, mass spectrometry measurements in proteomics were characterized as unique in identifying and quantifying cellular protein composition, but low throughput, requiring many hours to analyze a single sample. This was in conflict with the dynamics of changes in biological systems at the whole cellular proteome level upon the infl

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16

Fognini, A., T. U. Michlmayr, A. Vaterlaus, and Y. Acremann. "Laser-induced ultrafast spin current pulses: a thermodynamic approach." Journal of Physics: Condensed Matter 29, no. 21 (2017): 214002. http://dx.doi.org/10.1088/1361-648x/aa6a76.

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17

Sotome, M., M. Nakamura, J. Fujioka, et al. "Ultrafast spectroscopy of shift-current in ferroelectric semiconductor Sn2P2S6." Applied Physics Letters 114, no. 15 (2019): 151101. http://dx.doi.org/10.1063/1.5087960.

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18

Hai, Kuo, Yunrong Luo, Guishu Chong, Hao Chen, and Wenhua Hai. "Analytical evidence of ultrafast generation of spin-motion entanglement." Quantum Information and Computation 17, no. 5&6 (2017): 456–68. http://dx.doi.org/10.26421/qic17.5-6-5.

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We investigate ultrafast generation of spin-motion entanglement of a trapped and Gaussian-pulse-kicked two-level ion in the Lamb-Dicke limit and high field regime. A set of exact motional states and the probabilities occupying different pseudospin states are derived and the visible differences between the results with those of the delta-kick case are shown during a kick moment, which analytically evidence the ultrafast generation of an exact spin-motion entangled state regardless of initial state. Our results can be justified with the current experimental capability and provide an analytical m

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19

Wu, Yuxiang, Yongxiong Chen, Lingchao Kong, Zhiyuan Jing, and Xiubing Liang. "A Review on Ultrafast-Laser Power Bed Fusion Technology." Crystals 12, no. 10 (2022): 1480. http://dx.doi.org/10.3390/cryst12101480.

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Additive manufacturing of metals by employing continuous wave and short pulse lasers completely changes the way of modern industrial production. But the ultrafast laser has the superiority to short pulse laser and continuous wave laser in additive manufacturing. It has higher peak power, small thermal effect, high machining accuracy and low damage threshold. It can effectively perform additive manufacturing for special materials and improve the mechanical properties of parts. This article reviews the mechanism of the interaction between ultrafast laser and metal materials to rule the manufactu

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20

Kudelin, Igor, Srikanth Sugavanam, and Maria Chernysheva. "Rotation Active Sensors Based on Ultrafast Fibre Lasers." Sensors 21, no. 10 (2021): 3530. http://dx.doi.org/10.3390/s21103530.

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Gyroscopes merit an undeniable role in inertial navigation systems, geodesy and seismology. By employing the optical Sagnac effect, ring laser gyroscopes provide exceptionally accurate measurements of even ultraslow angular velocity with a resolution up to 10−11 rad/s. With the recent advancement of ultrafast fibre lasers and, particularly, enabling effective bidirectional generation, their applications have been expanded to the areas of dual-comb spectroscopy and gyroscopy. Exceptional compactness, maintenance-free operation and rather low cost make ultrafast fibre lasers attractive for sensi

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21

Qin, Muyang, Xinjing Zhao, Hanyue Fan, et al. "Ultrafast Laser Processing for High-Aspect-Ratio Structures." Nanomaterials 14, no. 17 (2024): 1428. http://dx.doi.org/10.3390/nano14171428.

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Over the past few decades, remarkable breakthroughs and progress have been achieved in ultrafast laser processing technology. Notably, the remarkable high-aspect-ratio processing capabilities of ultrafast lasers have garnered significant attention to meet the stringent performance and structural requirements of materials in specific applications. Consequently, high-aspect-ratio microstructure processing relying on nonlinear effects constitutes an indispensable aspect of this field. In the paper, we review the new features and physical mechanisms underlying ultrafast laser processing technology

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22

Keefer, Daniel, Stefano M. Cavaletto, Jérémy R. Rouxel, Marco Garavelli, Haiwang Yong, and Shaul Mukamel. "Ultrafast X-Ray Probes of Elementary Molecular Events." Annual Review of Physical Chemistry 74, no. 1 (2023): 73–97. http://dx.doi.org/10.1146/annurev-physchem-062322-051532.

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Elementary events that determine photochemical outcomes and molecular functionalities happen on the femtosecond and subfemtosecond timescales. Among the most ubiquitous events are the nonadiabatic dynamics taking place at conical intersections. These facilitate ultrafast, nonradiative transitions between electronic states in molecules that can outcompete slower relaxation mechanisms such as fluorescence. The rise of ultrafast X-ray sources, which provide intense light pulses with ever-shorter durations and larger observation bandwidths, has fundamentally revolutionized our spectroscopic capabi

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23

Atac, Omer Faruk, Hyunsu Lee, and Seoksu Moon. "Detecting ultrafast turbulent oscillations in near-nozzle discharged liquid jet using x-ray phase-contrast imaging with MHz frequency." Physics of Fluids 35, no. 4 (2023): 045102. http://dx.doi.org/10.1063/5.0143351.

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Characteristics of a discharged liquid jet in near-nozzle are determined by the in-flow turbulences generated by the evolution of inflow vortices and cavitation. High-fidelity simulations have indicated that such physical processes can generate ultrafast turbulent fluctuations (in the range of MHz) originating from the nature of turbulence by the interaction between the large and small-scale turbulence in the flow. Detecting ultrafast turbulent oscillations while resolving small-scale turbulences in the optically dense near-nozzle liquid jet has not been observed through experimental methods s

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24

Samreen, Naziya, Cecilia Mercado, Laura Heacock, Celin Chacko, Savannah C. Partridge, and Chloe Chhor. "Screening Breast MRI Primer: Indications, Current Protocols, and Emerging Techniques." Journal of Breast Imaging 3, no. 3 (2021): 387–98. http://dx.doi.org/10.1093/jbi/wbaa116.

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Abstract Breast dynamic contrast-enhanced MRI (DCE-MRI) is the most sensitive imaging modality for the detection of breast cancer. Screening MRI is currently performed predominantly in patients at high risk for breast cancer, but it could be of benefit in patients at intermediate risk for breast cancer and patients with dense breasts. Decreasing scan time and image interpretation time could increase cost-effectiveness, making screening MRI accessible to a larger group of patients. Abbreviated breast MRI (Ab-MRI) reduces scan time by decreasing the number of sequences obtained, but as multiple

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25

Wang, Lizhong, Huanyu Zhao, Dongyu Zhu, et al. "A Review on Ultrafast Laser Enabled Excellent Superhydrophobic Anti-Icing Performances." Applied Sciences 13, no. 9 (2023): 5478. http://dx.doi.org/10.3390/app13095478.

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Fabricating and developing superhydrophobic anti-icing surfaces have been a research hotspot for eliminating undesired icing issues. Among various fabricating strategies, ultrafast laser micro-nano fabrication is regarded as a greatly promising technique owing to its advantages of high geometric accuracy, highly flexible microstructure or dimension availability, no contact, and no material limitation. A number of diverse micro-nanostructured superhydrophobic surfaces have been developed by ultrafast lasers and demonstrated extraordinary anti-icing properties. They are collectively known as ult

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26

Omatsu, T., H. J. Kong, S. Park, et al. "The Current Trends in SBS and phase conjugation." Laser and Particle Beams 30, no. 1 (2012): 117–74. http://dx.doi.org/10.1017/s0263034611000644.

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AbstractThe current trends in stimulated Brillouin scattering and optical phase conjugation are overviewed. This report is formed by the selected papers presented in the “Fifth International Workshop on stimulated Brillouin scattering and phase conjugation 2010” in Japan. The nonlinear properties of phase conjugation based on stimulated Brillouin scattering and photo-refraction can compensate phase distortions in the high power laser systems, and they will also open up potentially novel laser technologies, e.g., phase stabilization, beam combination, pulse compression, ultrafast pulse shaping,

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27

SNIZHKO, Dmytro. "Ultrafast Potentiostat as Compromise between Current Sensitivity vs. Response Time." PRZEGLĄD ELEKTROTECHNICZNY 1, no. 8 (2019): 104–9. http://dx.doi.org/10.15199/48.2019.08.24.

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28

De Sio, Antonietta, and Christoph Lienau. "Vibronic coupling in organic semiconductors for photovoltaics." Physical Chemistry Chemical Physics 19, no. 29 (2017): 18813–30. http://dx.doi.org/10.1039/c7cp03007j.

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Ultrafast two-dimensional electronic spectroscopy reveals vibronically-assisted coherent charge transport and separation in organic materials and opens up new perspectives for artificial light-to-current conversion.

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29

Wall, Simon, Shan Yang, Luciana Vidas, et al. "Ultrafast disordering of vanadium dimers in photoexcited VO2." Science 362, no. 6414 (2018): 572–76. http://dx.doi.org/10.1126/science.aau3873.

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Many ultrafast solid phase transitions are treated as chemical reactions that transform the structures between two different unit cells along a reaction coordinate, but this neglects the role of disorder. Although ultrafast diffraction provides insights into atomic dynamics during such transformations, diffraction alone probes an averaged unit cell and is less sensitive to randomness in the transition pathway. Using total scattering of femtosecond x-ray pulses, we show that atomic disordering in photoexcited vanadium dioxide (VO2) is central to the transition mechanism and that, after photoexc

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30

Lin Ke-Sheng, Gao Yu, Zhong Xiao-Qing, and Jiang Xiao-Fang. "A method for measuring depth of focus in ultrafast pulsed laser systems based on <i>Z</i>-scan technique." Acta Physica Sinica 74, no. 7 (2025): 0. https://doi.org/10.7498/aps.74.20241658.

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As technology advances, ultrafast pulse lasers are increasingly used in a wide range of applications, including material processing, imaging, and medical treatments. The precision of these applications often depends on the ability to focus the laser beam to a tight spot with minimal divergence over a certain range along the optical axis. Therefore, accurate measurement of depth of focus (DOF) is crucial for optimizing the performance of ultrafast laser systems and ensuring the reliability of the results obtained in various experiments and applications. Traditional methods for DOF measurement p

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31

Hutchison, Christopher D. M., and Jasper J. van Thor. "Optical control, selection and analysis of population dynamics in ultrafast protein X-ray crystallography." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2145 (2019): 20170474. http://dx.doi.org/10.1098/rsta.2017.0474.

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Ultrafast pump-probe X-ray crystallography has now been established at X-ray free electron lasers that operate at hard X-ray energies. We discuss the performance and development of current applications in terms of the available data quality and sensitivity to detect and analyse structural dynamics. A discussion of technical capabilities expected at future high repetition rate applications as well as future non-collinear multi-pulse schemes focuses on the possibility to advance the technique to the practical application of the X-ray crystallographic equivalent of an impulse time-domain Raman me

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Ramunno, Lora, Esben Witting Larsen, Nan Lin, and Amelle Zaïr. "High harmonic generation in condensed and engineered materials: introduction." Journal of the Optical Society of America B 41, no. 6 (2024): HHG1. http://dx.doi.org/10.1364/josab.531574.

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The emerging field of high harmonic generation in condensed matter systems lies at the confluence of strong-field physics, ultrafast optics, and nanotechnology and offers numerous avenues for fundamental research and applications. The goals of this JOSA B feature issue on high harmonic generation in condensed and engineered materials are to facilitate interaction between the different communities and to provide an up-to-date snapshot of the current status of this rapidly developing interdisciplinary field at the frontier of condensed materials and ultrafast physics.

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Walsh, Martin A., Gwyndaf Evans, Ruslan Sanishvili, Irene Dementieva, and Andrzej Joachimiak. "MAD data collection – current trends." Acta Crystallographica Section D Biological Crystallography 55, no. 10 (1999): 1726–32. http://dx.doi.org/10.1107/s0907444999008392.

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The multiwavelength anomalous dispersion (MAD) method of protein structure determination is becoming a routine technique in protein crystallography. The increased number of wavelength-tuneable synchrotron beamlines capable of performing challenging MAD experiments, coupled with the widespread availability of charge-coupled device (CCD) based X-ray detectors with fast read-out times have brought MAD structure determination to a new exciting level. Ultrafast MAD data collection is now possible and, with the widespread use of selenium in the form of selenomethionine for phase determination, the m

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Penilla, E. H., L. F. Devia-Cruz, A. T. Wieg, et al. "Ultrafast laser welding of ceramics." Science 365, no. 6455 (2019): 803–8. http://dx.doi.org/10.1126/science.aaw6699.

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Welding of ceramics is a key missing component in modern manufacturing. Current methods cannot join ceramics in proximity to temperature-sensitive materials like polymers and electronic components. We introduce an ultrafast pulsed laser welding approach that relies on focusing light on interfaces to ensure an optical interaction volume in ceramics to stimulate nonlinear absorption processes, causing localized melting rather than ablation. The key is the interplay between linear and nonlinear optical properties and laser energy–material coupling. The welded ceramic assemblies hold high vacuum a

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JEONG, Young Uk, Kitae LEE, Kyu-Ha JANG, In Hyung BAEK, Hyun Woo KIM, and Key Young OANG. "Jitter-free Ultrafast Electron Diffraction Technology." Physics and High Technology 31, no. 11 (2022): 20–26. http://dx.doi.org/10.3938/phit.31.045.

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We introduce on ultrafast electron diffraction (UED) technology that observes the movement of fast-moving atoms. Recently the Korea Atomic Energy Research Institute has built the fastest electron diffraction facility in the world with the achievements of increasing beam brightness and improving temporal accuracy with jitter-free technology. We introduce the unique characteristics of the device with 90-degree-bending structure and conclude with the current status and prospects of the UED and its applications.

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Khaing, Zin Z., Lindsay N. Cates, Dane M. DeWees, et al. "Contrast-enhanced ultrasound to visualize hemodynamic changes after rodent spinal cord injury." Journal of Neurosurgery: Spine 29, no. 3 (2018): 306–13. http://dx.doi.org/10.3171/2018.1.spine171202.

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OBJECTIVETraumatic spinal cord injury (tSCI) causes an almost complete loss of blood flow at the site of injury (primary injury) as well as significant hypoperfusion in the penumbra of the injury. Hypoperfusion in the penumbra progresses after injury to the spinal cord and is likely to be a major contributor to progressive cell death of spinal cord tissue that was initially viable (secondary injury). Neuroprotective treatment strategies seek to limit secondary injury. Clinical monitoring of the temporal and spatial patterns of blood flow within the contused spinal cord is currently not feasibl

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Garming, Mathijs W. H., I. Gerward C. Weppelman, Martin Lee, Thijs Stavenga, and Jacob P. Hoogenboom. "Ultrafast scanning electron microscopy with sub-micrometer optical pump resolution." Applied Physics Reviews 9, no. 2 (2022): 021418. http://dx.doi.org/10.1063/5.0085597.

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Ultrafast scanning electron microscopy images carrier dynamics and carrier induced surface voltages using a laser pump electron probe scheme, potentially surpassing all-optical techniques in probe resolution and surface sensitivity. Current implementations have left a four order of magnitude gap between optical pump and electron probe resolution, which particularly hampers spatial resolution in the investigation of carrier induced local surface photovoltages. Here, we present a system capable of focusing the laser using an inverted optical microscope built into an ultrafast scanning electron m

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Seifert, Tom S., Liang Cheng, Zhengxing Wei, Tobias Kampfrath, and Jingbo Qi. "Spintronic sources of ultrashort terahertz electromagnetic pulses." Applied Physics Letters 120, no. 18 (2022): 180401. http://dx.doi.org/10.1063/5.0080357.

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Spintronic terahertz emitters are broadband and efficient sources of terahertz radiation, which emerged at the intersection of ultrafast spintronics and terahertz photonics. They are based on efficient spin-current generation, spin-to-charge-current conversion, and current-to-field conversion at terahertz rates. In this Editorial, we review the recent developments and applications, the current understanding of the physical processes, and the future challenges and perspectives of broadband spintronic terahertz emitters.

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TIAN, YE, FAN YANG, CHAOYU GUO, and YING JIANG. "RECENT ADVANCES IN ULTRAFAST TIME-RESOLVED SCANNING TUNNELING MICROSCOPY." Surface Review and Letters 25, Supp01 (2018): 1841003. http://dx.doi.org/10.1142/s0218625x18410032.

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Making smaller and faster functional devices has led to an increasing demand for a microscopic technique that allows the investigation of carrier and phonon dynamics with both high spatial and temporal resolutions. Traditional optical pump–probe methods can achieve femtosecond temporal resolution but fall short in the spatial resolution due to the diffraction limit. Scanning tunneling microscopy (STM), on the contrary, has realized atomic-scale spatial resolution relying on the high sensitivity of the tunneling current to the tip-sample distance. However, limited by the electronics bandwidth,

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Abdul-Hussain, Muhaiman Ali, and Haidar J. Mohamad. "Thermal Effect in a 3-D Simulation within Multilayer Thin Film of Ultrafast-Pulsed Laser." Al-Mustansiriyah Journal of Science 32, no. 4 (2021): 104–9. http://dx.doi.org/10.23851/mjs.v32i4.1039.

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Hard disk drive (HDD) and storage media have the potential to revolutionize future information technology. Heat-assisted magnetic recording (HAMR) is a promising method for increasing hard disk storage density and it is one of the applications of this study. The essential component of nanoscale spintronic devices is spin current. The simulation of a thermal gradient to generate a pure spin current using an ultrafast femtosecond (fs) laser in a multilayer thin film is presented. The trilayer sample (ferromagnetic/spacer/magnetic insulator) is the candidate to achieve the spin current. Ultrafast

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Kanno, Manabu, Hirohiko Kono та Yuichi Fujimura. "Laser-Control of Ultrafast π-Electron Ring Currents in Aromatic Molecules: Roles of Molecular Symmetry and Light Polarization". Applied Sciences 8, № 12 (2018): 2347. http://dx.doi.org/10.3390/app8122347.

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Being motivated by the recent progress in attosecond laser technology, we theoretically explore the strategy of inducing ultrafast electron dynamics inherent to aromatic molecules, i.e., ring currents by means of polarized laser pulses. The main topic of discussion is how to control the direction of ring currents in an aromatic molecule of low symmetry, for which the design of an efficient control pulse cannot be achieved intuitively. We first consider a system with a single aromatic ring and show that coherent π-electron angular momentum, which oscillates with time, can be produced and contro

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Wang, Fei Fei, and B. Wang. "Current Research Progress in Non-Classical Fourier Heat Conduction." Applied Mechanics and Materials 442 (October 2013): 187–96. http://dx.doi.org/10.4028/www.scientific.net/amm.442.187.

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Classical Fourier law can accurately describe most heat conduction problems. But for ultrafast heat conduction process and micro/nanoscale heat conduction problems, non-classical Fourier (non-Fourier) effect may become dominated. The paper gives a review on the current progress on non-Fourier heat conduction in engineering. It includes basic concept, physical models, thermal relaxation effect, and related experiments. Also introduced are the solution methods of non-Fourier heat conduction equations, including closed-form solution, finite difference method, finite element method, molecular dyna

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Cao, Xueqin, Yuanyuan Huang, Yayan Xi, et al. "Interplay between Ultrafast Shift Current and Ultrafast Photon Drag Current in Tellurium Nanotubes." ACS Photonics, August 29, 2022. http://dx.doi.org/10.1021/acsphotonics.2c00993.

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Wilson, Richard B., Yang Yang, Jon Gorchon, Charles-Henri Lambert, Sayeef Salahuddin, and Jeffrey Bokor. "Electric current induced ultrafast demagnetization." Physical Review B 96, no. 4 (2017). http://dx.doi.org/10.1103/physrevb.96.045105.

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Sennary, Mohamed, Jalil Shah, Mingrui Yuan, et al. "Light-induced quantum tunnelling current in graphene." Nature Communications 16, no. 1 (2025). https://doi.org/10.1038/s41467-025-59675-5.

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Abstract In the last decade, advancements in attosecond spectroscopy have allowed researchers to study and manipulate electron dynamics in condensed matter via ultrafast light fields, offering the possibility to realise ultrafast optoelectronic devices. Here, we report the generation of light-induced quantum tunnelling currents in graphene phototransistors by ultrafast laser pulses in an ambient environment. This tunnelling effect provides access to an instantaneous field-driven current, demonstrating a current switching effect (ON and OFF) on a ~630 attosecond scale (~1.6 petahertz speed). We

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Lv, Yinchuan, Soho Shim, Jonathan Gibbons, Axel Hoffmann, Nadya Mason, and Fahad Mahmood. "Ultrafast THz emission spectroscopy of spin currents in the metamagnet FeRh." APL Materials 12, no. 4 (2024). http://dx.doi.org/10.1063/5.0201789.

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Heterostructures of ferromagnetic (FM) and noble metal (NM) thin films have recently attracted considerable interest as viable platforms for the ultrafast generation, control, and transduction of light-induced spin currents. In such systems, an ultrafast laser can generate a transient spin current in the FM layer, which is then converted to a charge current at the FM/NM interface due to strong spin–orbit coupling in the NM layer. Whether such conversion can happen in a single material and how the resulting spin current can be quantified are open questions under active study. Here, we report ul

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Zhu, Mo, Milad Jalali, Zongzhi Zhang, et al. "Antiferromagnetic dynamics of Mn2Au driven by spin current pulses with perpendicular spin polarization." Applied Physics Letters 126, no. 22 (2025). https://doi.org/10.1063/5.0266902.

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Antiferromagnets hold promise for ultrafast coherent switching of magnetic order. This study uses atomistic-level dynamic simulations to investigate the ultrafast spin dynamics of Mn2Au under current pulses, incorporating the effects of polarized spin-current attenuation across Mn layers. Stable, coherent spin precession is achieved above a critical current density, with terahertz frequencies that scale linearly with current strength. Additionally, 90° or 180° Néel vector switching within 1 ps, influenced by current density and pulse duration, demonstrates the possibility of precise control of

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Somnath, S., K. J. H. Law, A. N. Morozovska, et al. "Ultrafast current imaging by Bayesian inversion." Nature Communications 9, no. 1 (2018). http://dx.doi.org/10.1038/s41467-017-02455-7.

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Huang, Lin, Liyang Liao, Hongsong Qiu, et al. "Antiferromagnetic magnonic charge current generation via ultrafast optical excitation." Nature Communications 15, no. 1 (2024). http://dx.doi.org/10.1038/s41467-024-48391-1.

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AbstractNéel spin-orbit torque allows a charge current pulse to efficiently manipulate the Néel vector in antiferromagnets, which offers a unique opportunity for ultrahigh density information storage with high speed. However, the reciprocal process of Néel spin-orbit torque, the generation of ultrafast charge current in antiferromagnets has not been demonstrated. Here, we show the experimental observation of charge current generation in antiferromagnetic metallic Mn2Au thin films using ultrafast optical excitation. The ultrafast laser pulse excites antiferromagnetic magnons, resulting in insta

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Kang, Kyuhwe, Hiroki Omura, Daniel Yesudas, et al. "Spin current driven by ultrafast magnetization of FeRh." Nature Communications 14, no. 1 (2023). http://dx.doi.org/10.1038/s41467-023-39103-2.

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AbstractLaser-induced ultrafast demagnetization is an important phenomenon that probes arguably the ultimate limits of the angular momentum dynamics in solid. Unfortunately, many aspects of the dynamics remain unclear except that the demagnetization transfers the angular momentum eventually to the lattice. In particular, the role and origin of electron-carried spin currents in the demagnetization process are debated. Here we experimentally probe the spin current in the opposite phenomenon, i.e., laser-induced ultrafast magnetization of FeRh, where the laser pump pulse initiates the angular mom

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