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Your search keyword '"Bendavid, Avi"' showing total 287 results
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287 results on '"Bendavid, Avi"'

1. Direct writing of high temperature superconducting Josephson junctions using a thermal scanning probe

Author

Duong, Ngoc My Hanh, Berhane, Amanuel M., Mitchell, Dave, Ullah, Rifat, Zhang, Ting, Zhu, He, Du, Jia, Lam, Simon K. H., Mitchell, Emma E., and Bendavid, Avi

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Materials Science, Quantum Physics
Abstract

In this letter, we demonstrate for the first time the creation of Josephson-like superconducting nanojunctions using a thermal scanning probe to directly inscribe weak links into microstrips of YBa2Cu3O7-x (YBCO). Our method effectively reduces the critical current (Ic) over an order of magnitude. The resulting nanobridges exhibit clear evidence of Josephson effects, of SNS-type junctions, as shown by both the DC and AC Josephson effects. This approach provides a novel and flexible method for scaling up quantum mechanical circuits that operate at liquid nitrogen temperatures. Additionally, it offers a promising pathway for modifying properties of the junctions in-situ and post fabrication., Comment: 14 pages, 4 figures

Published
2024

2. Structural and optical properties of micro-diamonds with SiV- color centers

Author

Isa, Fabio, Joliffe, Matthew, Wouterlood, Brendan, Ho, Naomi He, Volz, Thomas, Bendavid, Avi, and Rogers, Lachlan J.

Subjects
Condensed Matter - Materials Science, Physics - Applied Physics, Quantum Physics
Abstract

Isolated, micro-meter sized diamonds are grown by micro-wave plasma chemical vapour deposition technique on Si(001) substrates. Each diamond is uniquely identified by markers milled in the Si substrate by Ga+ focused ion beam. The morphology and micrograin structure analysis indicates that the diamonds are icosahedral or bi-crystals. Icosahedral diamonds have higher (up to $\sigma_\mathrm{h}$ = 2.3 GPa), and wider distribution ($\Delta\sigma_\mathrm{h}$ = 4.47 GPa) of hydrostatic stress built up at the microcrystal grain boundaries, compared to the other crystals. The number and spectral shape of SiV- color centers incorporated in the micro-diamonds is analysed, and estimated by means of temperature dependent photoluminescence measurements, and Montecarlo simulations. The Montecarlo simulations indicate that the number of SiV- color centers is a few thousand per micro-diamond., Comment: 10 pages, 8 figures

Published
2022

3. Bottom-Up Synthesis of Hexagonal Boron Nitride Nanoparticles with Intensity-Stabilized Quantum Emitters

Author

Chen, Yongliang, Xu, Xiaoxue, Li, Chi, Bendavid, Avi, Westerhausen, Mika T., Bradac, Carlo, Toth, Milos, Aharonovich, Igor, and Tran, Toan Trong

Subjects
Physics - Optics, Condensed Matter - Materials Science
Abstract

Fluorescent nanoparticles are widely utilized in a large range of nanoscale imaging and sensing applications. While ultra-small nanoparticles (size <10 nm) are highly desirable, at this size range their photostability can be compromised due to effects such as intensity fluctuation and spectral diffusion caused by interaction with surface states. In this letter, we demonstrate a facile, bottom-up technique for the fabrication of sub-10-nm hBN nanoparticles hosting photostable bright emitters via a catalyst-free hydrothermal reaction between boric acid and melamine. We also implement a simple stabilization protocol that significantly reduces intensity fluctuation by ~85% and narrows the emission linewidth by ~14% by employing a common sol-gel silica coating process. Our study advances a promising strategy for the scalable, bottom-up synthesis of high-quality quantum emitters in hBN nanoparticles.

Published
2021

12. Room temperature single photon emission from oxidized tungsten disulphide multilayers

Author

Tran, Toan Trong, Choi, Sumin, Scott, John A., Xu, Zai-quan, Zheng, Changxi, Seniutinas, Gediminas, Bendavid, Avi, Fuhrer, Michael S., Toth, Milos, and Aharonovich, Igor

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

Two dimensional systems offer a unique platform to study light matter interaction at the nanoscale. In this work we report on robust quantum emitters fabricated by thermal oxidation of tungsten disulphide multilayers. The emitters show robust, optically stable, linearly polarized luminescence at room temperature, can be modeled using a three level system, and exhibit moderate bunching. Overall, our results provide important insights into understanding of defect formation and quantum emitter activation in 2D materials.

Published
2016

15. Atomic-Layer Deposition of the Single-Atom Pt Catalyst on Vertical Graphene for H2 Sensing.

Author

Liu, Bo, Han, Zhaojun, Bendavid, Avi, Martin, Philip J., Kumar, Priyank V., Haghshenas, Yousof, Alamri, Mohammed, and Wu, Judy Z.

Abstract

Single-atom catalysts have the advantage of high chemical efficiency, which requires atomic-scale control during catalyst formation. In order to address this challenge, this work explores the synthesis of single-atom platinum (SA-Pt) catalysts using atomic-layer deposition (ALD) on vertical graphene (VG), in which a large number of graphene edges serve as energetically favorable nucleation sites for SA-Pt, as predicted by density functional theory calculations. Interestingly, SA-Pt has been achieved on VGs at low ALD cycle numbers of up to 60. With a further increase in the number of ALD cycles, an increasing number of Pt clusters with diameters <2 nm and Pt nanoparticles (NPs) with diameters >2 nm become dominant (nano-Pt @VG). This is in contrast to the observation of predominantly nano-Pt on other carbon nanostructures, such as carbon nanotubes and monolayer graphene, under the same ALD growth conditions, indicating that the edge states on VG indeed play a critical role in facilitating the formation of SA-Pt. Profound differences are revealed in a comparative study on H2 sensing. SA-Pt exhibits both a higher sensitivity and faster response than its nano-Pt counterpart by more than an order of magnitude, illustrating the high catalytic efficiency of SA-Pt and its potential for gas sensing and a variety of other catalytic applications. [ABSTRACT FROM AUTHOR]

Published
2024
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36. Enhancing the Biocompatibility of Additively Manufactured Ti‐6al‐4 V Eli with Diamond‐Like Carbon Coating.

Author

Yick, Samuel, Reneman, Jake, Martin, Philip J., Evans, Margaret D.M., Bean, Penelope A., Söhnel, Tilo, Tse, Nicholas M. K., and Bendavid, Avi

Subjects
DIAMOND-like carbon, ELECTRON beam furnaces, SURFACE chemistry, ORTHOPEDIC implants, SURFACE coatings
Abstract

Orthopedic implants provide patients with an opportunity to regain functionality lost from illness, disease, or injury. Recent advancements in additive manufacturing (AM) techniques have allowed for the increased customization of Ti‐6Al‐4V ELI (extra low interstitials) implants to complement natural variations in the human anatomy. Yet, the low bioactivity of Ti‐6Al‐4 V ELI and possible adverse effects from the leeching of aluminum and vanadium complicate the post‐operation recovery process. In this work, Ti‐6Al‐4 V ELI samples are printed using the electron beam melt technique in two directions and coated with diamond‐like carbon (DLC) to examine whether their biological properties can be improved. By conducting in vitro studies with Saos‐2 osteosarcoma cells, the effects of morphology and surface chemistry are correlated to the bioactivities of the coated and uncoated samples. The outcome of the study suggested that DLC coating is a viable method for controlling the surface bioactivity of a material. It indicates that a carbon coating, along with an appropriate topography, has the potential to promote the proliferation and maturity of bone cells and hence enhance the performance of additively manufactured products in next‐generation biomedical applications. [ABSTRACT FROM AUTHOR]

Published
2023
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48. Green ammonia synthesis using CeO2/RuO2 nanolayers on vertical graphene catalyst via electrochemical route in alkaline electrolyte

Author

Ju, HyungKuk, primary, Seo, Dong Han, additional, Chung, Sunki, additional, Mao, Xin, additional, An, Byeong-Seon, additional, Musameh, Mustafa, additional, Gengenbach, Thomas R., additional, Shon, Hokyong, additional, Du, Aijun, additional, Bendavid, Avi, additional, Ostrikov, Kostya (Ken), additional, Yoon, Hyung Chul, additional, Lee, Jaeyoung, additional, and Giddey, Sarbjit, additional

Published
2022
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