Article
Multidisciplinary Sciences
Alessandro Lunghi
Summary: Spin-phonon coupling plays a crucial role in spin relaxation and decoherence in solid-state semiconductors. This study combines advanced electronic structure methods with time-local master equations to predict spin-phonon relaxation times in various solid-state coordination compounds, demonstrating the feasibility of an accurate and fully ab initio implementation of spin relaxation theory.
Article
Materials Science, Multidisciplinary
M. Pregelj, A. Zorko, D. Arcon, M. Klanjsek, N. Jansa, P. Jeglic, O. Zaharko, S. Kraemer, M. Horvatic, A. Prokofiev
Summary: In this study, a comprehensive investigation of β-TeVO4 using nuclear magnetic resonance technique reveals the dynamic nature of spin-density-wave (SDW) and spin-stripe phases in this material. In the high-field phase, the arrangement of magnetic moments is similar to that of the SDW phase, possibly stabilized by magnetic anisotropy.
Article
Materials Science, Multidisciplinary
Marwan Deb, Elena Popova, Steffen Peer Zeuschner, Michel Hehn, Niels Keller, Stephane Mangin, Gregory Malinowski, Matias Bargheer
Summary: This paper investigates the magnetic, optical, and lattice responses of a Pt/Cu/Bi1Y2Fe5O12/Gd3Ga5O12 heterostructure to femtosecond laser excitation, revealing the generation of high-frequency standing spin waves in the dielectric Bi1Y2Fe5O12 layer through phonon-induced change of magnetic anisotropy. It is found that incoherent phonons can lead to both fast and slow decreases of magnetic order through different spin-phonon interaction scenarios.
Article
Physics, Multidisciplinary
Jinsoo Park, Jin-Jian Zhou, Yao Luo, Marco Bernardi
Summary: Developing a microscopic understanding of spin decoherence is crucial for advancing quantum technologies. In this study, the authors present a computational approach that unifies the modeling of two main sources of phonon-induced spin decoherence and enables accurate predictions of spin relaxation and precession in semiconductors. Their findings highlight the significant role of vertex correction in the electron spin dynamics in solids, providing insights for the development of spin-based quantum technologies.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Peter Millington-Hotze, Santanu Manna, Saimon F. Covre da Silva, Armando Rastelli, Evgeny A. Chekhovich
Summary: The spin diffusion in inhomogeneously polarized many-body systems, such as nuclear spin lattices, is described classically by the spin diffusion concept. In this study, the authors directly observed spin diffusion in a single GaAs/AlGaAs quantum dot through oscillatory spin relaxation dynamics and found that electron spin accelerates nuclear spin relaxation, challenging the previously proposed Knight-field-gradient diffusion barrier concept. The findings have significant implications for understanding nuclear spin diffusion in quantum dots.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
V. V. Belykh, A. R. Korotneva, D. R. Yakovlev
Summary: By simultaneously applying a radio frequency field and periodic optical pulses, this study successfully addresses the issue of inhomogeneity and fluctuating environment affecting the coherence time of an electron spin ensemble. The research resulted in a 50-Hz-narrow electron spin resonance with milliseconds-long T-2 in Ce3+ ions, paving the way for coherent optical manipulation in spin systems decoupled from their inhomogeneous environment.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Togar Saragi, Bayu Permana, Arnold Therigan, Hotmas D. D. Sinaga, Trisna Maulana, Risdiana Risdiana
Summary: The magnetic properties and relaxation time of Fe3O4 nanoparticles, and their encapsulation with silicon dioxide (Fe3O4-SiO2), were successfully investigated. The measurements showed that the encapsulation process increased superparamagnetic interactions and significantly changed the magnetic parameters and irreversibility values.
Article
Chemistry, Physical
A. Ziani, S. Al-Taweel, M. A. Nadeem, H. Idriss
Summary: The properties of Au/ZnO materials with different Au contents were studied, and it was found that the presence of Au led to pronounced plasmon resonance and faster decay rate. The effect of Au particles on the radiative recombination rates of ZnO was quantified by fitting and integrating the coverage of Au atoms on the surface. The highest charge trapping efficiency of Au atoms was observed at very low coverage.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Multidisciplinary Sciences
Burak Guzelturk, Benjamin L. Cotts, Dipti Jasrasaria, John P. Philbin, David A. Hanifi, Brent A. Koscher, Arunima D. Balan, Ethan Curling, Marc Zajac, Suji Park, Nuri Yazdani, Clara Nyby, Vladislav Kamysbayev, Stefan Fischer, Zach Nett, Xiaozhe Shen, Michael E. Kozina, Ming-Fu Lin, Alexander H. Reid, Stephen P. Weathersby, Richard D. Schaller, Vanessa Wood, Xijie Wang, Jennifer A. Dionne, Dmitri Talapin, A. Paul Alivisatos, Alberto Salleo, Eran Rabani, Aaron M. Lindenberg
Summary: A study reveals that transient lattice deformations are observed in photoexcited nanocrystals, with surface deformations induced by localized charges at trap sites. The structural distortions are influenced by the excitation energy, showing different behaviors when the photon energy is above or close to the bandgap.
NATURE COMMUNICATIONS
(2021)
Review
Materials Science, Coatings & Films
Gerd Schoenhense, Hans-Joachim Elmers
Summary: Momentum microscopy (MM) is a novel technique for angle-resolved photoelectron spectroscopy (ARPES) that offers advantages in photon-hungry experiments. This article introduces the ToF-MM technique and demonstrates its performance in various spectral ranges. It also discusses the applications of MM in spin-resolved and time-resolved ARPES.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Multidisciplinary Sciences
Z. Wang, L. Balembois, M. Rancic, E. Billaud, M. Le Dantec, A. Ferrier, P. Goldner, S. Bertaina, T. Chaneliere, D. Esteve, D. Vion, P. Bertet, E. Flurin
Summary: Electron spin resonance spectroscopy is the preferred method for characterizing paramagnetic impurities, but it only provides ensemble-averaged quantities due to limited signal-to-noise ratio. To achieve single-electron spin sensitivity, we use spin fluorescence detection method and a microwave photon counter at millikelvin temperatures. By coupling individual paramagnetic erbium ions in a scheelite crystal to a high-quality-factor planar superconducting resonator to enhance their radiative decay rate, we obtain a fluorescence signal with a signal-to-noise ratio of 1.9 in one second integration time. This method has the potential for single-spin detection in a volume as large as the resonator magnetic mode volume, making it orders of magnitude larger than other single-spin detection techniques.
Article
Materials Science, Multidisciplinary
Marcel Holtmann, Peter Krueger, Koji Miyamoto, Taichi Okuda, Kenya Shimada, Markus Donath
Summary: The surface electronic structure of Re(0001) was investigated using experimental and theoretical methods. Spin-and angle-resolved photoemission were employed to study the spin-dependent energy dispersion of electronic states. Band-structure calculations based on density-functional theory were compared with the experimental results. Additional calculations were performed to consider transitions into final states. It was found that Rashba-type spin splittings were observed and there was no out-of-plane spin polarization due to the monatomic steps on the real Re(0001) surface.
Article
Optics
Spencer Batalden, Vanessa Sih
Summary: Time-resolved Kerr rotation microscopy was used to generate and measure spin valley polarization in monolayer tungsten diselenide grown by MOCVD. The Kerr signal showed bi-exponential decay with time constants of 100 ps and 3 ns, revealing larger spin valley polarization near the edges of triangular flakes. Spatial dependence of the Kerr signal was observed across multiple WSe2 flakes, indicating it is not due to spin diffusion on the nanosecond timescale.
Article
Physics, Applied
Lei Tan, Andrei V. Sapelkin, Alston J. Misquitta, Craig L. Bull, He Lin, Haolai Tian, Haijun Huang, Martin T. Dove
Summary: In this study, high-pressure neutron powder diffraction and synchrotron x-ray total scattering were used to investigate the elastic properties of Fe3O4 magnetite nanoparticles. The results showed that nanoparticles are more elastic than the bulk form. The atomic and magnetic structures of the nanoparticles did not change significantly with size or pressure, except for the 8 nm sample, which exhibited a disordered spinel structure instead of the inverse spinel structure observed in larger nanoparticles and the bulk form.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Paper & Wood
Krishna Kishor Dey, Manasi Ghosh
Summary: This study investigates how the nuclear spin dynamics of a polysaccharide are affected by its anionic side chain. The results show that the anionic side chain increases the spin-lattice relaxation rate and local correlation time of the polysaccharide, leading to enhanced solubility and hydration compared to cellulose.
Review
Chemistry, Multidisciplinary
Tian Qiao, Dong Hee Son
Summary: Recent synthetic progress in strongly quantum-confined cesium lead halide nanocrystals has enabled precise control of quantum confinement, leading to exploration of unique properties. Research highlights the size-dependent absorption cross section, confinement effects on exciton fine structure, and activation of forbidden exciton transition enhanced by quantum confinement. Expectations for expanded functionality of MHP nanocrystals in various applications.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Article
Biochemistry & Molecular Biology
Huanhuan Chen, Xihong Xie, Tai-Yen Chen
Summary: Protein organization modification is crucial for cell functions, and simultaneous quantification of oligomeric states and parameters in cells is necessary for understanding their correlation. Recent advances in fluorescence protein and single-molecule localization microscopy have enabled the determination of protein localizations and oligomeric states in cells.
CURRENT OPINION IN STRUCTURAL BIOLOGY
(2021)
Article
Physics, Applied
Shengxiang Wu, Oscar Hsu-Cheng Cheng, Boqin Zhao, Nicki Hogan, Annika Lee, Dong Hee Son, Matthew Sheldon
Summary: Recent studies show that the anti-Stokes Raman signal can determine two temperatures of carriers inside the metal; The majority of the Raman signal is from inelastic scattering with carriers in a non-thermal energy distribution excited via surface plasmon damping; Experimental results demonstrate how a simple fitting procedure can reveal the plasmon dephasing time and the temperatures of hot carriers and the metal lattice.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Hong-Rae Kim, Ji-Hong Bong, Jun-Hee Park, Zhiquan Song, Min-Jung Kang, Dong Hee Son, Jae-Chul Pyun
Summary: A hypersensitive photosensor based on CsPbBr3 quantum dots was developed for chemiluminescence immunoassays, showing high sensitivity and reduced trap states, making it feasible for detecting various diseases.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Connor Orrison, Jeremy R. Meeder, Bowen Zhang, Joseph Puthenpurayil, Michael B. Hall, Michael Nippe, Dong Hee Son
Summary: Mn-doped quantum dots demonstrate highly efficient photocatalytic conversion reactions, particularly in the transformation of formate to carbon monoxide. The long-range hot electron transfer plays a critical role in enhancing the catalytic efficiency by reducing nonbinding intermediate species. Spectroscopic and computational studies reveal the mechanism behind the significant increase in CO production efficiency facilitated by Mn-doped quantum dots.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Cell & Tissue Engineering
Pei-San Huang, Meng-Hsuan Wen, Xihong Xie, An Xu, Dung-Fang Lee, Tai-Yen Chen
Summary: By genetically modifying H1 human embryonic stem cells to express SOD1-SNAP fusion proteins, researchers have created a versatile platform for imaging-based studies of SOD1, enabling the study of endogenous SOD1 behavior under a microscope.
STEM CELL RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Tian Qiao, Xiaohan Liu, Daniel Rossi, Mohit Khurana, Yulin Lin, Jianguo Wen, Jinwoo Cheon, Alexey V. Akimov, Dong Hee Son
Summary: The magnetic effect of Mn2+ ions on excitons in CsPbI3 quantum dots was investigated, revealing that Mn-doped CsPbI3 QDs had little influence on the behavior of bright excitons but showed a significant impact on the decay rate of dark excitons, equivalent to an external magnetic field of approximately 3 T. Further study is needed to fully understand the origin of the large difference in the magneto-optic property of excitons in the two systems, with antiferromagnetic coupling of the dopants considered as an important contributing factor.
Article
Chemistry, Multidisciplinary
Chih-Wei Wang, Connor Orrison, Dong Hee Son
Summary: This article reviews recent progress in the research on hot electron generation via upconversion and their application in photocatalytic reactions, highlighting the benefits of long-range transfer of energetic hot electrons.
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2022)
Article
Biochemical Research Methods
Hong-Rae Kim, Ji-Hong Bong, Tae-Hun Kim, Seung-Shick Shin, Min-Jung Kang, Won-Bo Shim, Do Young Lee, Dong Hee Son, Jae-Chul Pyun
Summary: A one-step homogeneous immunoassay using the switching peptide H2 was developed for rapid detection of influenza viruses A and B. This method eliminates the need for washing steps and can be conducted in solution, with graphene used as a fluorescence quencher to enhance sensitivity.
Article
Chemistry, Physical
Xueting Tang, Daniel Rossi, Jinwoo Cheon, Dong Hee Son
Summary: Investigated the photoluminescence properties of strongly quantum confined CsPbBr3 quantum dots at low temperatures, and found that electronic coupling between dots can cause redshift of photoluminescence, narrowing of bright-dark exciton level splitting, and acceleration of photoluminescence decay.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Oscar Hsu-Cheng Cheng, Boqin Zhao, Zachary Brawley, Dong Hee Son, Matthew T. Sheldon
Summary: This study reports that modulating the polarization state of light can significantly decrease the plasmon damping of chiral plasmonic nanostructures. Under continuous wave optical excitation, the reflectance and optical field concentration increased by up to 8% and 35.7%, respectively. These effects were observed even in the presence of an external magnetic field. The decrease in plasmon damping is rationalized through the Lorentz forces acting on the circulating electron trajectories. These results provide strategies for actively modulating intrinsic losses in metals through optomagnetic effects encoded in the polarization state of incident light.
Article
Chemistry, Multidisciplinary
Chih-Wei Wang, Xiaohan Liu, Tian Qiao, Mohit Khurana, Alexey V. Akimo, Dong Hee Son
Summary: This study identifies Mn-doped CsPbBr3 nanocrystals as an excellent platform for hot electron upconversion, benefiting from the structural diversity of metal halide perovskites. Two-dimensional Mn-doped CsPbBr3 nanoplatelets are particularly advantageous in the upconversion process due to the strong exciton-dopant interaction, and evidence for hot electron upconversion via long-lived dark excitons is observed.
Article
Chemistry, Multidisciplinary
Moon-Ju Kim, Joo-Yoon Noh, Tae Gyeong Yun, Min-Jung Kang, Dong Hee Son, Jae-Chul Pyun
Summary: This study systematically investigates the effect of laser shock waves on the ionization of graphitic carbon nitride nanosheets, showing enhanced LDI-MS performance through modulation of charge carrier motion. The results provide a mechanistic understanding of ionization processes crucial for revealing the full potential of laser shock waves in LDI-MS.
Article
Chemistry, Physical
Xueting Tang, Mohit Khurana, Daniel Rossi, Lanyin Luo, Alexey V. Akimov, Dong Hee Son
Summary: Imposing strong quantum confinement in metal halide perovskite quantum dots not only tunes the exciton transition energy but also alters other photophysical properties. This study focused on the strongly quantum-confined formamidinium lead bromide quantum dots and compared them with cesium lead bromide quantum dots in terms of photoluminescence, fine structure, and decay dynamics.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Tian Qiao, Madison E. E. Edwards, Xueting Tang, Xin Yan, Dong Hee Son
Summary: Despite the challenges posed by reverse charge transfer or charge recombination, cesium lead halide (CsPbX3) nanocrystals can selectively generate stable aminium or aminyl radicals from amines by controlling the imbalance of electron and hole populations achieved through varying the solvent composition. In the presence of dihalomethane, the irreversible removal of electrons enables efficient oxidative generation of aminium radicals. In the absence of dihalomethane, the availability of both electrons and holes leads to the production of aminyl radicals via sequential hole transfer and reductive N-H bond dissociation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
