Article
Physics, Condensed Matter
H. Sharona, U. Bhat
Summary: In recent years, two-dimensional transition metal dichalcogenide alloys have become a research hotspot, showing rich variations in optical excitations. Experimental and theoretical studies have revealed diverse electronic structures and bandgap properties in these alloys, which may have potential applications in various electronic and optoelectronic devices.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Hongbin Yang, Andrea Konecna, Xianghan Xu, Sang-Wook Cheong, Eric Garfunkel, F. Javier Garcia de Abajo, Philip E. Batson
Summary: This study demonstrates the existence of relatively long-lived plasmons supported by high-mobility charge carriers in La-doped BaSnO3. The properties of infrared localized surface plasmons in BLSO nanoparticles are systematically investigated using electron energy-loss spectroscopy. The results show that LSPs in BLSO exhibit a high degree of spatial confinement compared to noble metals, and have relatively low losses and high quality factors. Further analysis clarifies the relation between plasmon damping and carrier mobility in BLSO.
Article
Chemistry, Physical
Chih-Feng Wang, Patrick Z. El-Khoury
Summary: The research demonstrates that four-wave mixing at plasmonic tip-sample nano-junctions can visualize plasmonic fields with sub-2 nm spatial resolution under ambient laboratory conditions. By utilizing specific techniques, the four-wave mixing signal can be further enhanced, paving the way for visualizing chemical transformations and coherent electronic and vibrational dynamics with femtosecond temporal and few-nanometer spatial resolution under ambient conditions.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Multidisciplinary
I. Benabdallah, Y. Auad, W. Sigle, P. A. van Aken, M. Kociak, M. Benaissa
Summary: This study utilizes monochromated low-loss electron energy-loss spectroscopy to investigate the bandgap and exciton energies of black phosphorus flakes in the near infrared region. The research successfully demonstrates the ability of this technique to reveal unprecedented electronic and excitonic transitions in very narrow bandgap semiconductors.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Multidisciplinary Sciences
Robert Stockill, Moritz Forsch, Frederick Hijazi, Gregoire Beaudoin, Konstantinos Pantzas, Isabelle Sagnes, Remy Braive, Simon Groblacher
Summary: In this study, the authors demonstrate bi-directional on-chip conversion between microwave and optical frequencies using a gallium phosphide optomechanical resonator. The remarkable properties of the material and the appropriate optical pump enable efficient photon conversion, establishing gallium phosphide as a versatile platform for ultra-low-noise conversion of photons between microwave and optical frequencies.
NATURE COMMUNICATIONS
(2022)
Article
Microscopy
Maureen J. Lagos, Isobel C. Bicket, S. Shayan M. Mousavi, Gianluigi A. Botton
Summary: Sub-50 meV atom-wide electron probes are routinely produced for electron energy loss spectroscopy in transmission electron microscopes. Gradual improvements in energy resolution enable the study of very low-energy excitations. The applications extend to lattice phonons, molecular vibrations, infrared plasmons, and strongly coupled hybrid modes in nanomaterials. The spectroscopy analyses now extend towards probing extremely complex broadband platforms and understanding plasmon lifetime and 3D photonic density of states.
Article
Chemistry, Multidisciplinary
Vahagn Mkhitaryan, Katia March, Eric Nestor Tseng, Xiaoyan Li, Leonardo Scarabelli, Luis M. Liz-Marzan, Shih-Yun Chen, Luiz H. G. Tizei, Odile Stephan, Jenn-Ming Song, Mathieu Kociak, F. Javier Garcia de Abajo, Alexandre Gloter
Summary: This study demonstrates high-quality vis-IR plasmons with quality factors >60 in long copper nanowires, determined by electron energy-loss spectroscopy. By comparing measurements of silver and copper nanowires of different diameters, the relative importance of radiative and nonradiative losses in plasmons is elucidated, revealing copper's potential advantages in high-quality plasmonics in elongated nanostructures.
Article
Materials Science, Multidisciplinary
Sumanth Arige, Vikash Mishra, Muralidhar Miryala, M. S. Ramachandra Rao, Tejendra Dixit
Summary: This study investigates the sub-bandgap emission properties of ultra-wide bandgap CuO thin films and finds that CuO exhibits near-infrared (NIR) emission under sub-bandgap excitation, which can be enhanced by incorporating Au nanoparticles. Temperature-dependent photoluminescence measurements show enhanced Purcell effect in Au and CuO. DFT studies are performed to understand the effect of defects on the emission and absorption properties of CuO. Electron paramagnetic resonance measurements and current-voltage characteristics are used to study the effect of Au on other optical and electrical features.
Article
Engineering, Electrical & Electronic
Lukas Buryanec, Sandor Petenyi, Giuseppina Bille', Calogero Ribellino, Jiri Jakovenko
Summary: This article describes the design and fabrication of a high-performance linear low dropout regulator (LDO) capable of supplying 1 A of output current in the 180 nm BCD technology of STMicroelectronics. The LDO is designed to provide a stable output voltage for high-resolution sensors in cellphone cameras. It features a large N-channel power transistor, enabling an ultra-low dropout voltage of around 50 mV at a load current of 1 A, even at a low output voltage of 0.4 V. The LDO also ensures a 1% accuracy of the output voltage across full temperature range and line and load conditions, along with a very low quiescent current, good transient response, and high power supply rejection ratio (PSRR) of more than 85 dB at 1 kHz. The LDO is programmable, allowing for setting the output voltage and other functions through post-package electrical trimming. Additionally, an efficient design for testability (DFT) is implemented to ensure high quality and reduce the number of failed parts.
MICROELECTRONICS JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Roja Singh, Eduard Madirov, Dmitry Busko, Ihteaz M. Hossain, Vasilii A. Konyushkin, Andrey N. Nakladov, Sergey Kuznetsov, Amjad Farooq, Saba Gharibzadeh, Ulrich W. Paetzold, Bryce S. Richards, Andrey Turshatov
Summary: This study demonstrates that using a fluoride single crystal like BaF2:Yb3+, Er3+ for UC is an effective method to extend the response of perovskite solar cells to near-infrared illumination at 980 nm, resulting in enhanced current at very high incident intensities. Upconverted photons contribute to an increase in short-circuit current density, with a non-linear relationship with the incident intensity of sub-bandgap illumination.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Takanori Asano, Manabu Tezura, Masumi Saitoh, Hiroki Tanaka, Jun Kikkawa, Koji Kimoto
Summary: We observed the nanoscale distribution of subgap excitations induced by Ga-ion beam processing in beta-Si3N4 using electron energy-loss spectroscopy. By combining crystallinity, composition, and bandgap measurements, we found that defects excited at different energy levels exhibit different dependence trends with respect to crystallinity. This proposed technique can effectively distinguish between various amorphous materials.
APPLIED PHYSICS EXPRESS
(2022)
Article
Chemistry, Multidisciplinary
Benedikt Haas, Tara M. Boland, Christian Elsaesser, Arunima K. Singh, Katia March, Juri Barthel, Christoph T. Koch, Peter Rez
Summary: Phonon scattering at grain boundaries plays a crucial role in controlling the thermal conductivity of nanoscale devices. This study uses monochromated electron energy loss spectroscopy (EELS) in the scanning transmission electron microscope (STEM) to measure the 60 meV optic mode at grain boundaries in silicon at atomic resolution. The results show the existence of localized phonon modes and support the idea that grain boundaries can act as waveguides.
Article
Optics
Tian Dong, Jiujiu Liang, Sarah Camayd-Munoz, Yueyang Liu, Haoning Tang, Shota Kita, Peipei Chen, Xiaojun Wu, Weiguo Chu, Eric Mazur, Yang Li
Summary: The researchers have designed a zero-index medium with ultra-low loss, capable of achieving zero refractive index at the telecommunications wavelength. This material can be used in nonlinear and quantum optics applications, benefiting from infinite coherence length.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Physics, Applied
Xudong He, Jin Chen, Mingji Chen, Hongchen Chu, Yun Lai, Daining Fang
Summary: This paper proposes a 3D-printed ultra-broadband planar Luneburg lens composed of periodic gradient structures, with a large operating frequency range. It demonstrates high efficiency achromatic sub-diffraction focusing and highly directive far-field radiation pattern.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Mechanics
Ze Liu, Hao-Wen Dong, Gui-Lan Yu, Li Cheng
Summary: This study utilizes topology optimization to design seismic metamaterials, achieving broadband low-frequency surface wave bandgaps, which is crucial for protecting surrounding buildings and structures.
COMPOSITE STRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Ting-You Li, Xuezhu Xu, Chun-Ho Lin, Xinwei Guan, Wei-Hao Hsu, Meng-Lin Tsai, Xiaosheng Fang, Tom Wu, Jr-Hau He
Article
Green & Sustainable Science & Technology
Hengyu Guo, Jie Chen, Longfei Wang, Aurelia Chi Wang, Yafeng Li, Chunhua An, Jr-Hau He, Chenguo Hu, Vincent K. S. Hsiao, Zhong Lin Wang
Summary: This study introduces a corona-type, mechanically stimulated triboelectric NAI generator that efficiently produces negative air ions for air purification. The device is simple, safe, and effective, offering a sustainable solution for improving indoor air quality.
NATURE SUSTAINABILITY
(2021)
Article
Materials Science, Multidisciplinary
Danhao Wang, Chen Huang, Xin Liu, Haochen Zhang, Huabin Yu, Shi Fang, Boon S. Ooi, Zetian Mi, Jr-Hau He, Haiding Sun
Summary: This study reports the demonstration of self-powered deep UV solar-blind photodetectors in a photoelectrochemical cell configuration, showing excellent responsivity, fast response speed, and large photocurrent density at 254 nm illumination. The superior performance can be attributed to the successful synthesis of uniform and defect-free AlGaN nanowires as well as the boosted carrier separation and collection efficiency through Ru decoration.
ADVANCED OPTICAL MATERIALS
(2021)
Review
Materials Science, Multidisciplinary
Xinwei Guan, Xuechao Yu, Dharmaraj Periyanagounder, Mercy Rose Benzigar, Jing-Kai Huang, Chun-Ho Lin, Jiyun Kim, Simrjit Singh, Long Hu, Guozhen Liu, Dehui Li, Jr-Hau He, Feng Yan, Qi Jie Wang, Tom Wu
Summary: 2D materials show promise in optoelectronic applications, particularly in infrared detectors, due to their unique electronic, optical, and mechanical properties. Recent research focuses on the design and optimization of devices in the short-wave, mid-wave, and long-wave infrared regimes, discussing the impact of 2D material properties on device performance and the characteristics and challenges of heterostructures based on 2D materials.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Daniel Garcia-Lojo, Evgeny Modin, Sergio Gomez-Grana, Marianne Imperor-Clerc, Andrey Chuvilin, Isabel Pastoriza-Santos, Jorge Perez-Juste, Doru Constantin, Cyrille Hamon
Summary: This study analyzes the organization of gold octahedra into supercrystals within microfluidic channels using X-ray scattering techniques and FIB-SEM tomography. The results show the formation of a single-domain supercrystal with long-range order, suggesting a growth mechanism directed by the channel interface. Time-resolved small angle X-ray scattering analysis reveals the accumulation of nanoparticles within the channel before nucleation and growth of the supercrystal.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jieli Lyu, Wajdi Chaabani, Evgeny Modin, Andrey Chuvilin, Thomas Bizien, Frank Smallenburg, Marianne Imperor-Clerc, Doru Constantin, Cyrille Hamon
Summary: This study makes progress in nanoparticle design, obtaining colloidal supercrystals of pentagonal gold bipyramids and revealing their packing characteristics and potential applications in optical response.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Junhyeon Jo, Francesco Calavalle, Beatriz Martin-Garcia, Daniel Tezze, Felix Casanova, Andrey Chuvilin, Luis E. Hueso, Marco Gobbi
Summary: This study demonstrates the emergence of spinterface effects at the interface between Fe3GeTe2 and Co-phthalocyanine. Magnetotransport measurements show that the molecular layer induces a magnetic exchange bias in Fe3GeTe2, indicating antiferromagnetic ordering in Co-phthalocyanine and pinning of the magnetization reversal of Fe3GeTe2 via magnetic proximity.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Francesco Calavalle, Manuel Suarez-Rodriguez, Beatriz Martin-Garcia, Annika Johansson, Diogo C. Vaz, Haozhe Yang, Igor Maznichenko, Sergey Ostanin, Aurelio Mateo-Alonso, Andrey Chuvilin, Ingrid Mertig, Marco Gobbi, Felix Casanova, Luis E. Hueso
Summary: This study explores the relationship between symmetry, relativistic effects, and electronic transport in chiral materials, and demonstrates the all-electrical generation, manipulation, and detection of spin polarization in chiral single-crystalline tellurium nanowires. The orientation of the electrically generated spin polarization is determined by the nanowire handedness and follows the current direction, while its magnitude can be manipulated by an electrostatic gate.
Article
Chemistry, Multidisciplinary
Jose F. Gomez-Cortes, Maria L. No, Andrey Chuvilin, Isabel Ruiz-Larrea, Jose M. San Juan
Summary: Cu-Al-Ni is a high-temperature shape memory alloy (HTSMA) that exhibits exceptional thermomechanical properties and is suitable for high-temperature MEMS/NEMS technologies. Recent studies have shown that this alloy has robust superelastic behavior at the nanometer scale, making it a good choice for developing new generations of micro-/nano-electromechanical systems. The experimental results indicate that the Cu-Al-Ni thin films produced by solid-state diffusion have high thermal stability, which is suitable for the development of high-temperature MEMS/NEMS.
Article
Materials Science, Multidisciplinary
Isabel C. Arango, Alberto Anadon, Silvestre Novoa, Van Tuong Pham, Won Young Choi, Junior Alegre, Laurent Badie, Andrey Chuvilin, Luis E. Hueso, Felix Casanova, Carlos Rojas-Sanchez
Summary: This study investigates the spin-to-charge conversion in BixSe1-x using spin-pumping technique from ferromagnetic resonance, with a focus on the interfacial properties of the system. The results show that the spin Hall angle of BixSe1-x is consistent with that of Pt, but the charge current generated from spin-to-charge conversion is more than one order of magnitude lower than that of Pt. This is attributed to the interdiffusion between BixSe1-x and permalloy, as well as the resulting changes in chemical composition, which is an inherent characteristic of the system often overlooked in other studies.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Inge Groen, Van Tuong Pham, Stefan Ilic, Andrey Chuvilin, Won Young Choi, Edurne Sagasta, Diogo C. Vaz, Isabel C. Arango, Nerea Ontoso, F. Sebastian Bergeret, Luis E. Hueso, Ilya V. Tokatly, Felix Casanova
Summary: Spin-orbitronic devices can integrate memory and logic by exploiting spin-charge interconversion. Investigation of interfaces in these devices is important to understand their functionality. In this study, the origin and efficiency of spin-charge interconversion in a Py/Cu/W lateral spin valve are explored, revealing a promising candidate for magnetic readout in MESO logic devices.
Review
Chemistry, Physical
Yao Yang, Julian Feijoo, Valentin Briega-Martos, Qihao Li, Mihail Krumov, Stefan Merkens, Giuseppe De Salvo, Andrey Chuvilin, Jianbo Jin, Haowei Huang, Christopher J. Pollock, Miquel B. Salmeron, Cheng Wang, David A. Muller, Hector D. Abruna, Peidong Yang
Summary: This review summarizes the recent advances in operando electrochemical liquid-cell scanning transmission electron microscopy and correlative synchrotron X-ray methods, which can comprehensively study reaction dynamics across multiple spatiotemporal scales. To encourage widespread adoption of these advanced methods, the review highlights the need for benchmarking electrochemistry in confined and heterogeneous liquid environments with minimal beam-induced damage.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Isabel C. Arango, Won Young Choi, Van Tuong Pham, Inge Groen, Diogo C. Vaz, Punyashloka Debashis, Hai Li, D. C. Mahendra, Kaan Oguz, Andrey Chuvilin, Luis E. Hueso, Ian A. Young, Felix Casanova
Summary: The development of spin-orbitronic devices requires materials with high resistance and high spin-charge interconversion efficiency. In this study, nonlocal spin valves are used to investigate the spin properties of sputtered BixSe1-x material. The obtained results show the spin diffusion length and spin Hall angle, indicating that the efficiency of this material is not exceptional.
Article
Nanoscience & Nanotechnology
Stefan Merkens, Giuseppe De Salvo, Andrey Chuvilin
Summary: This study explores the peculiarities of beam-induced chemistry in the presence of a flowing liquid within a heterogeneously irradiated nanoconfined channel corresponding to a LP-TEM flow cell. It is found that under moderate flow conditions, the concentration of some principal chemical species increases significantly, which is counterintuitive.
Article
Chemistry, Multidisciplinary
Ana Sanchez-Iglesias, Joscha Kruse, Andrey Chuvilin, Marek Grzelczak
Summary: In the process of synthesizing inorganic nanoparticles, metallic nanocrystals can be utilized as photocatalysts to regenerate cofactor molecules, enabling their cyclic regeneration and reuse in the nucleation process, opening up new possibilities for the sustainable synthesis of inorganic nanoparticles.
Article
Microscopy
C. Gao, C. Hofer, T. J. Pennycook
Summary: Ptychography provides high dose efficiency images that can reveal light elements next to heavy atoms. However, contrast reversals can occur when the projected potential becomes strong. Recent research has shown that these reversals can be counteracted by adapting the focus. This study explains why the best contrast is often found with the probe focused to the middle of the sample and highlights the importance of convergence angle in thin samples to remove contrast reversals.
Article
Microscopy
J. Lindner, U. Ross, T. Meyer, V. Boureau, M. Seibt, Ch. Jooss
Summary: Phase-shifting electron holography is an excellent method with high phase sensitivity to reveal electron wave phase information. An advanced drift correction scheme is proposed in this study, which exploits the interface of the TEM specimen and the vacuum area in the hologram. This method allows for obtaining reliable phase information.
Article
Microscopy
Ali Jaberi, Nicolas Brodusch, Jun Song, Raynald Gauvin
Summary: This study investigates knock-on damage in lithium-ion batteries (LIBs) by computing threshold displacement energies (TDEs) and performing Monte Carlo simulation. The results indicate that Li is most sensitive to knock-on damage at moderate electron energies, and TDE is the principal parameter for assessing Li sensitivity to knock-on damage across similar structures.
Article
Microscopy
Alexander Schroeder, Christopher Rathje, Leon van Velzen, Maurits Kelder, Sascha Schaefer
Summary: This study utilizes novel event-based electron detector platforms to extend the temporal resolution of electron microscopy. By training a neural network to predict electron arrival time, the researchers were able to improve the timing accuracy and achieve a promising solution for enhancing electron timing precision in various electron microscopy applications.
Article
Microscopy
Avi Auslender, Nivedita Pandey, Amit Kohn, Oswaldo Dieguez
Summary: This article describes a faster implementation based on DFT for computing the mean inner potential of crystals, providing quantum-mechanical calculations beyond the independent-atom approximation. The study also reveals the dependence of the mean inner potential on sample boundary conditions, mass density, and magnetic susceptibility, highlighting its correlation with various material properties.
Article
Microscopy
Zhidong Yang, Dawei Zang, Hongjia Li, Zhao Zhang, Fa Zhang, Renmin Han
Summary: In this work, we propose a self-supervised deep learning model for cryo-ET volumetric image denoising based on noise modeling and sparsity guidance. Experimental results demonstrate that our method can achieve reliable denoising by training on single noisy volume and outperform existing methods.
Article
Microscopy
J. Kuttruff, J. Holder, Y. Meng, P. Baum
Summary: In this study, a robust clustering algorithm is proposed that can find clusters in a continuous stream of raw data in real time. This algorithm converts pixel hits measured by hybrid pixel detectors to real single-electron events. By continuously comparing with previous hits, the algorithm efficiently identifies the merging of new and old events.
Article
Microscopy
D. G. Senturk, C. P. Yu, A. De Backer, S. Van Aert
Summary: This article presents a statistics-based method for accurately counting the number of atoms in nanostructures, especially for images acquired with low electron doses and multiple element structures.
Article
Microscopy
Mauricio J. Prieto, Lucas de Souza Caldas, Liviu C. Tanase, Thomas Schmidt, Oscar Rodriguez de la Fuente
Summary: This study presents a synchrotron-based investigation of the synthesis process of a magnetite/hematite bilayer. Ion bombardment gradually transforms hematite into magnetite, and the growth of magnetite leads to the formation of stable boundaries. These findings are significant for understanding novel oxide heterostructures.
Article
Microscopy
Emre Yoruk, Holger Klein, Stephanie Kodjikian
Summary: Beam sensitive nanomaterials pose challenges for crystallographic structure determination. A dose symmetric electron diffraction tomography (DS-EDT) method is developed to reduce beam damage and obtain complete data sets by merging individual datasets from multiple crystals.
Article
Microscopy
A. Pofelski, Y. Zhu, G. A. Botton
Summary: The precision and sensitivity of the GPA method for strain characterization is a widely discussed topic. This study introduces the concept of phase noise and analyzes the parameter of sampling to improve the precision of GPA. Experimental and theoretical results demonstrate that using a larger pixel spacing in STEM can enhance the precision and sensitivity of the GPA method.
Article
Microscopy
Sangjun Kang, Di Wang, Christian Kuebel, Xiaoke Mu
Summary: Transmission electron microscopy is a valuable tool for assessing strain fields within materials. However, using thin specimens in TEM analysis can affect atomic configuration and deformation structure.
