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488 results on '"Chen, Wei-Ying"'

1. Deterministic Creation of Identical Monochromatic Quantum Emitters in Hexagonal Boron Nitride

Author

Hua, Muchuan, Chen, Wei-Ying, Hou, Hanyu, Kolluru, Venkata Surya Chaitanya, Chan, Maria K. Y., Liu, HaiHua, Gage, Thomas E., Zuo, Jian-Min, Diroll, Benjamin T., and Wen, Jianguo

Subjects
Condensed Matter - Materials Science, Quantum Physics
Abstract

Deterministic creation of quantum emitters with high single-photon-purity and excellent indistinguishability is essential for practical applications in quantum information science. Many successful attempts have been carried out in hexagonal boron nitride showing its capability of hosting room temperature quantum emitters. However, most of the existing methods produce emitters with heterogeneous optical properties and unclear creation mechanisms. Here, the authors report a deterministic creation of identical room temperature quantum emitters using masked-carbon-ion implantation on freestanding hBN flakes. Quantum emitters fabricated by our approach showed thermally limited monochromaticity with an emission center wavelength distribution of 590.7 +- 2.7 nm, a narrow full width half maximum of 7.1 +- 1.7 nm, excellent brightness (1MHz emission rate), and extraordinary stability. Our method provides a reliable platform for characterization and fabrication research on hBN based quantum emitters, helping to reveal the origins of the single-photon-emission behavior in hBN and favoring practical applications, especially the industrial-scale production of quantum technology., Comment: 29 pages, 5 figures, research article

Published
2024

2. The self-annealing of irradiation induced defects in magnetite Fe3O4: Revealing reversible irradiation-induced disorder transformation through in situ TEM.

Author

Lopez Morales, Angelica M., Chen, Wei-Ying, and Kaoumi, Djamel

Subjects
*METAL-insulator transitions, *TRANSMISSION electron microscopy, *LATTICE constants, *AMORPHIZATION, *HETEROSTRUCTURES
Abstract

This work reports heavy ion-irradiation effects in polycrystalline Fe3O4. For this matter, Fe/Fe3O4 heterostructures were irradiated in situ in a transmission electron microscopy with 1 MeV Kr ions at 50 K. Evidence of cubic to monoclinic transformation (a.k.a Verwey transition) was recorded in some magnetite grains upon cooling the sample (around 90 K); however, most of the oxide grains retain their cubic spinel structure. Irradiation effects were analyzed in the cubic phase up to a maximum dose of 38 dpa without the sign of amorphization. The extinction of first-order reflections was recorded at doses below 1 dpa, indicating the formation of a new (metastable) phase with half of the lattice parameters compared to the unirradiated Fe3O4 crystal. The formation of the new crystalline phase, which also presents a high resistance to amorphization, is related to the disordering of the cation lattice and the high mobility of the cation interstitials. The metastable phase readily recovers around 225 K during the natural warming of the sample from 50 K to room temperature. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Precise application of topical tranexamic acid to enhance endoscopic hemostasis for peptic ulcer bleeding: a randomized controlled study (with video)

Author

Chiang, Hsueh-Chien, Chen, Po-Jun, Yang, Er-Hsiang, Hsieh, Ming-Tsung, Shih, I-Cheng, Cheng, Hsiu-Chi, Chang, Wei-Lun, Chen, Wei-Ying, Chiu, Hung-Chih, Kuo, Hsin-Yu, Tsai, Wei-Chu, Lo, Yi-Ning, Yang, Kai-Chun, Chiang, Chien-Ming, Chen, Wei-Chih, Huang, Kuan-Kai, Tseng, Hsu-Huan, Chen, Chiung-Yu, Lin, Xi-Zhang, and Chuang, Chiao-Hsiung

Published
2023
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18. Can the Finger-Nose-Finger Task Be Used to Identify School-Aged Children with Probable Developmental Coordination Disorder?

Author

Li, Yao-Chuen, Chen, Wei-Ying, Zhu, Yi-Ching, and Wu, Sheng K

Abstract

This study aimed to investigate whether the Finger-Nose-Finger (FNF) task could be a potential test to identify school-aged children with probable Developmental Coordination Disorder (pDCD) from a large population. This study recruited 1365 nine to twelve years old children, 362 of whom were identified as pDCD using the Movement Assessment Battery for Children (MABC) test. An instrument was designed to conduct the FNF task. The times performed by the dominant hand (DH) and the non-dominant hand (NDH) in 30 seconds were recorded, as well as the Sum of both hands. The results showed that school-aged children with pDCD had significantly poor performance on DH, NDH, and Sum of the FNF task compared to typically developing children (all p's <0.001). However, the FNF task showed low sensitivity (24.9%) and low diagnostic rate (65.7%) against the MABC test, even though there was a significant moderate correlation between both tests (r = -0.300, p < 0.001). Taken together, even though school-aged children with pDCD perform worse on the FNF task, this task may not be sensitive enough to identify children with pDCD. Other testing items assessing other motor aspects, specifically balance, should be included and validated.

Published
2021
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