Article
Computer Science, Information Systems
Pengfei Li, Shuhua Wei, Xuanwu Kang, Yingkui Zheng, Jing Zhang, Hao Wu, Ke Wei, Jiang Yan, Xinyu Liu
Summary: The study developed an oxygen plasma surface treatment to reduce the ohmic contact resistance for AlGaN/GaN HEMTs on a high-resistive Si substrate. By optimizing the oxygen plasma conditions, a lower resistance was obtained, with the primary factor being the large nitrogen vacancy induced by the oxygen plasma treatment.
Article
Materials Science, Multidisciplinary
Il-Hwan Hwang, Ho-Young Cha, Kwang-Seok Seo
Summary: This paper discusses the use of low-damage atomic layer etching (ALE) with O-2 and BCl3 plasma for etching (Al)GaN, which showed excellent self-limiting etch characteristics and high linearity compared to conventional digital etching. The electrical characteristics of the recessed Schottky diodes fabricated by ALE were superior to those fabricated by digital etching.
Article
Chemistry, Multidisciplinary
Umberto Celano, Hai Zhong, Florin Ciubotaru, Laurentiu Stoleriu, Alexander Stark, Peter Rickhaus, Felipe Favaro de Oliveira, Mathieu Munsch, Paola Favia, Maxim Korytov, Patricia Van Marcke, Patrick Maletinsky, Christoph Adelmann, Paul van der Heide
Summary: In this study, nonperturbative field distribution mapping in ultra-scaled magnetic nanowires with diameters down to 6 nm was achieved using scanning nitrogen-vacancy magnetometry, enabling localized, minimally invasive magnetic imaging with sensitivity down to 3 μT Hz(-1/2). The imaging revealed the presence of weak magnetic inhomogeneities inside in-plane magnetized nanowires, largely undetectable with standard metrology. The strong magnetic field confinement in the nanowires allowed for the study of the interaction between the stray magnetic field and the nitrogen-vacancy sensor, clarifying the formation mechanisms for technologically relevant magnetic nanostructures.
Article
Chemistry, Physical
Zhitian Shi, Konstantins Jefimovs, Antonino La Magna, Marco Stampanoni, Lucia Romano
Summary: By introducing metal electric field modulators, controlled tilted etching can be achieved by modifying the near sample surface potential, thereby changing the incident angle of ions and obtaining a tilted profile.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Multidisciplinary
M. Perdriat, P. Huillery, C. Pellet-Mary, G. Hetet
Summary: This study predicts and reports the strong diamagnetism of nanodiamonds with embedded NV centers. The ability to control the magnetic susceptibility and crystalline axis direction shows promising potential for various applications.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Linfeng Zhang, Bing Wu, Yi Zhang, Hui Deng
Summary: Plasma-based atom-selective etching (PASE) is used to efficiently planarize the GaN surface. Non-toxic carbon tetrafluoride is chosen as the reaction gas for PASE, which improves the volatility of etching products. PASE of GaN reduces surface roughness from Sa 135.8 nm to Sa 0.527 nm in 2 minutes, with a material removal rate 93.01 μm/min, thousands of times higher than the conventional chemical mechanical polishing method. The crystal structure of the GaN subsurface remains intact, proving the non-destructive nature of PASE. Furthermore, the effects of radio frequency power and reaction gas flow rate on PASE are investigated.
APPLIED SURFACE SCIENCE
(2023)
Article
Optics
Alexandr Belosludtsev, Andrius Melninkaitis, Giedrius Abromavicius
Summary: The high quality surface of YAG crystals is important for high-power laser system design. This research demonstrates the potential of enhancing Laser-induced damage threshold (LIDT) through plasma etching of YAG crystal surface, especially for picosecond laser pulses. By optimizing the etching conditions, the LIDT value can be increased by more than three times and reach the intrinsic LIDT of the bulk crystal.
Article
Engineering, Electrical & Electronic
Chuan Cheng, Yuan Ren, Chengguo Li, Bin Dong, Changan Wang, Xihui Liang, Ningyang Liu, Zhitao Chen, Shuti Li
Summary: This study investigates a mixed etching method consisting of ICP dry etching and digital etching to remove the p-GaN capping layer. The results show that this method effectively improves the surface damage and achieves a smoother surface. Furthermore, the presence of NVRS in the devices plays a key role in the discharging effect of the C-V characteristics of SBDs. A charge-discharge C-V model is developed based on the discharging effect of NVRS, which proves to be valid in cases of inadequate etching of p-GaN and over-etching of AlGaN. Additionally, it is found that retaining a p-GaN thin layer weakens the discharging effect.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Biochemistry & Molecular Biology
Huu Tuan Le, Ji Eon Lee, So Yeon Yun, Ohyung Kwon, Jin Kuen Park, Young Kyu Jeong
Summary: This study found that plasma treatment can enhance the electrocatalytic activity of surface oxygen vacancies, thereby improving the efficiency and reducing the cost of water splitting for hydrogen production. Hollow NiCoPBA nanocages grown on nickel foam were treated with N plasma and thermally reduced to induce oxygen vacancies and N doping. These oxygen defects played a key role in improving the catalytic efficiency and charge transfer efficiency of NiCoPBA. The N-doped hollow NiCoPBA/NF demonstrated excellent OER performance in an alkaline medium, with a low overpotential of 289 mV at 10 mA cm(-2) and high stability for 24 hours. The catalyst outperformed a commercial RuO2 (350 mV). The use of plasma-induced oxygen vacancies and N doping provides a novel insight into the design of low-cost NiCoPBA electrocatalysts.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Takeyuki Tsuji, Hitoshi Ishiwata, Takeharu Sekiguchi, Takayuki Iwasaki, Mutsuko Hatano
Summary: Diamond film sensors with large volumes and perfectly aligned NV ensembles, synthesized using MPCVD, have the potential for highly sensitive quantum magnetometers. This study achieved a high growth rate and contrast of diamond film containing perfectly aligned NV ensembles by using high power density plasma and controlling gas flow rate ratios. The EPR spectroscopy and Ramsey sequence results confirmed the high quality of the obtained diamond sensor films.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Engineering, Manufacturing
Yi Zhang, Linfeng Zhang, Keyu Chen, Dianzi Liu, Dong Lu, Hui Deng
Summary: This method proposes a rapid detection of subsurface damage (SSD) of SiC using atmospheric inductivity coupled plasma, optimizing detection through plasma diagnosis and simulation and confirming accuracy with STEM analysis. Rapid screening ability for SSD is demonstrated, making it a promising approach for rapid detection.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2021)
Article
Optics
Zhonghao Li, Yanling Liang, Chong Shen, Zhenrong Shi, Huanfei Wen, Hao Guo, Zongmin Ma, Jun Tang, Jun Liu
Summary: In this study, wide-field tomography imaging of double circuits was performed using nitrogen-vacancy (NV) center ensembles in a diamond. By employing an inversion model and vector magnetic superposition, the magnetic-field distribution on the surface of the lower layer circuit was obtained. The results provide a simple and highly accurate reference for the detection and fault diagnosis of multilayer and integrated circuits.
Article
Chemistry, Multidisciplinary
Denghu Wang, Siqi Zhang, Chunguang Li, Xiaobo Chen, Wei Zhang, Xin Ge, Haibo Lin, Zhan Shi, Shouhua Feng
Summary: In this study, a mesoporous Al0.35Mn2.52O4 with ultrahigh surface area was fabricated through the synergistic regulation strategy of defect engineering and atomic composition tuning for improving the performance of electrode materials in ZIBs. The Al0.35Mn2.52O4 cathode exhibited high reversible capacity and good cycling stability, providing a new perspective for enhancing ZIBs performance.
Article
Engineering, Electrical & Electronic
Maolin Pan, Qiang Wang, Luyu Wang, Penghao Zhang, Yannan Yang, Lewen Qian, Xinlin Xie, Hai Huang, Saisheng Xu, Chunlei Wu, Chen Wang, Min Xu, David Wei Zhang
Summary: In this study, an NH3/N2 plasma surface treatment technique is developed to replenish the nitrogen vacancy on the etched AlGaN surface during p-GaN HEMTs fabrication. The effectiveness of the treatment is confirmed through XPS surface characterization. By using this technique, the drain current of severely over-etched devices can be recovered from 148 to over 300 mA/mm, accompanied by improved current collapse immunity, a threshold voltage of +1.5 V, and an Ion/Ioff ratio of over 1 x 108.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Chemistry, Physical
Yuan He, Chengwei Sun, Shidong Fang, Muhammad Shaban, Changlun Chen
Summary: A facile NTP treatment was conducted to modify NiCoLDH nanowires, introducing N-doping and oxygen vacancies for improved electrochemical performance. The optimized electrode (P-NiCoNW/CC-150) showed outstanding capacitance performance and excellent cycling stability. An asymmetric supercapacitor device assembled with the electrodes exhibited high energy density.
APPLIED SURFACE SCIENCE
(2024)
Article
Physics, Multidisciplinary
Dolev Bluvstein, Zhiran Zhang, Ania C. Bleszynski Jayich
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
Dolev Bluvstein, Zhiran Zhang, Claire A. McLellan, Nicolas R. Williams, Ania C. Bleszynski Jayich
PHYSICAL REVIEW LETTERS
(2019)
Article
Materials Science, Multidisciplinary
Tim R. Eichhorn, Claire A. McLellan, Ania C. Bleszynski Jayich
PHYSICAL REVIEW MATERIALS
(2019)
Article
Physics, Applied
D. P. L. Aude Craik, P. Kehayias, A. S. Greenspon, X. Zhang, M. J. Turner, J. M. Schloss, E. Bauch, C. A. Hart, E. L. Hu, R. L. Walsworth
PHYSICAL REVIEW APPLIED
(2020)
Article
Multidisciplinary Sciences
Mena N. Gadalla, Andrew S. Greenspon, Rodrick Kuate Defo, Xingyu Zhang, Evelyn L. Hu
Summary: Two post-fabrication processes were explored to enhance the optical emission of silicon vacancies V-Si(-) in 4H silicon carbide, including below-bandgap irradiation at different wavelengths and thermal annealing. The results demonstrate that these methods improve the coupling between defects and cavities, providing insights into defect modifications and interactions.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Materials Science, Multidisciplinary
Lila V. H. Rodgers, Lillian B. Hughes, Mouzhe Xie, Peter C. Maurer, Shimon Kolkowitz, Ania C. Bleszynski Jayich, Nathalie P. de Leon
Summary: Emerging quantum technologies rely on the precise control of quantum systems, with diamond defects such as the negatively charged nitrogen-vacancy center showing promise for a range of applications. However, the unique properties of diamond present challenges, highlighting the need for advancements in materials science for characterization, growth, defect control, and fabrication in order to fully leverage diamond's potential for quantum technologies.
Review
Nanoscience & Nanotechnology
Andreas J. Heinrich, William D. Oliver, Lieven M. K. Vandersypen, Arzhang Ardavan, Roberta Sessoli, Daniel Loss, Ania Bleszynski Jayich, Joaquin Fernandez-Rossier, Arne Laucht, Andrea Morello
Summary: Over the past three decades, nanoscience and quantum science have merged to create a new research field known as quantum-coherent nanoscience. This review focuses on the fundamental principles and practical applications of quantum coherence in nanoscale systems, as well as the challenges and opportunities ahead.
NATURE NANOTECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Malcolm J. A. Jardine, John P. T. Stenger, Yifan Jiang, Eline J. de Jong, Wenbo Wang, Ania C. Bleszynski Jayich, Sergey M. Frolov
Summary: Majorana zero modes are expected to be present in semiconductor-superconductor hybrid systems for potential topological quantum computing applications. This proposal suggests using devices with micromagnets to address the challenge of requiring a high external magnetic field that changes direction at the nanoscale. Numerical simulations of stray magnetic fields from different micromagnet configurations were conducted to solve for Majorana wavefunctions, and the feasibility of the approach was assessed through magnetic imaging of prototype patterns.
Article
Quantum Science & Technology
Maxime Joos, Dolev Bluvstein, Yuanqi Lyu, David Weld, Ania Bleszynski Jayich
Summary: This article introduces a method of mitigating quantum decoherence based on spectral engineering of the environmental noise, and demonstrates experimentally that it outperforms monochromatic techniques. The results are consistent with quantitative modeling, and pave the way for active decoherence protection using custom-designed waveforms applied to the environment.
NPJ QUANTUM INFORMATION
(2022)
Article
Physics, Multidisciplinary
Alec Jenkins, Susanne Baumann, Haoxin Zhou, Simon A. Meynell, Yang Daipeng, Kenji Watanabe, Takashi Taniguchi, Andrew Lucas, Andrea F. Young, Ania C. Bleszynski Jayich
Summary: This study uses nitrogen-vacancy center magnetometry to investigate the local breakdown of Ohm's law in a high mobility graphene monolayer. The results show that at room temperature, the current concentration occurs at the edges of the constriction, but as the temperature decreases below 200 K, the current concentrates near the center of the constriction, indicating a crossover from diffusive to viscous electron transport.
PHYSICAL REVIEW LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Lillian B. Hughes, Zhiran Zhang, Chang Jin, Simon A. Meynell, Bingtian Ye, Weijie Wu, Zilin Wang, Emily J. Davis, Thomas E. Mates, Norman Y. Yao, Kunal Mukherjee, Ania C. Bleszynski C. Jayich
Summary: Using plasma-enhanced chemical vapor deposition epitaxial growth with delta-doping, we have successfully engineered dense 2D nitrogen and NV layers with a density of 1 ppm·nm. We characterized the density and dimensionality of the P1 and NV layers using traditional materials techniques and NV spin decoherence-based measurements. The P1 density was found to be between 5-10 ppm·nm, the NV density can be tuned to 1-3.5 ppm·nm by electron irradiation dosage, and the depth confinement of the spin layer is approximately 1.6 nm. We also observed a high ratio of NV to P1 centers up to 0.74 and reproducibly long NV coherence times, mainly influenced by dipolar interactions with the engineered P1 and NV spin baths.
Article
Physics, Multidisciplinary
E. J. Davis, B. Ye, F. Machado, S. A. Meynell, W. Wu, T. Mittiga, W. Schenken, M. Joos, B. Kobrin, Y. Lyu, Z. Wang, D. Bluvstein, S. Choi, C. Zu, A. C. Bleszynski Jayich, N. Y. Yao
Summary: The quantum decoherence dynamics of probe spins in diamond defects can be used to study strongly interacting many-body systems, and the information about the many-body system can be obtained by measuring the decoherence dynamics of the probe qubit.
Article
Physics, Applied
Zhiran Zhang, Maxime Joos, Dolev Bluvstein, Yuanqi Lyu, Ania C. Bleszynski Jayich
Summary: A single-spin quantum sensor detects and images fluctuating electromagnetic fields by measuring the sensor spin's relaxation time, providing important information about the target structure. However, the sensitivity and resolution are often limited by the distance between the sensor and target. To address this, researchers propose using an auxiliary reporter spin with a diamond nitrogen-vacancy (N-V) center, achieving a 100-fold sensitivity improvement in realistic conditions. Experimental verification using a single shallow N-V center validates the proposed method, which eliminates the need for optical initialization and readout capabilities.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Simon A. Meynell, Claire A. McLellan, Lillian B. Hughes, Wenbo Wang, Tom E. Mates, Kunal Mukherjee, Ania C. Bleszynski Jayich
APPLIED PHYSICS LETTERS
(2020)
Article
Quantum Science & Technology
Jeffrey Cady, Ohad Michel, Kenneth W. Lee, Rishi N. Patel, Christopher J. Sarabalis, Amir H. Safavi-Naeini, Ania C. Bleszynski Jayich
QUANTUM SCIENCE AND TECHNOLOGY
(2019)