A5100691150- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Thin-Film Transistor Technologies
- Quantum and electron transport phenomena
- Digital Holography and Microscopy
- Conducting polymers and applications
- Silicon Carbide Semiconductor Technologies
- Graphene research and applications
- Silicon Nanostructures and Photoluminescence
- Quantum Dots Synthesis And Properties
- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Multimedia Communication and Technology
- Quantum Computing Algorithms and Architecture
- Molecular Junctions and Nanostructures
- Silicon and Solar Cell Technologies
- Perovskite Materials and Applications
- Near-Field Optical Microscopy
- Force Microscopy Techniques and Applications
- Nanowire Synthesis and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Semiconductor materials and interfaces
Electronics and Telecommunications Research Institute
2006-2024
Gwangju Institute of Science and Technology
2020-2024
Ulsan National Institute of Science and Technology
2015-2024
Inha University
2000-2023
West Virginia University
2023
Korea Institute of Science & Technology Information
2017-2022
Hankuk University of Foreign Studies
2021
Central Research Institute of Electric Power Industry
2021
Saitama University
2021
National Institute of Advanced Industrial Science and Technology
2021
Optically interfaced spins in the solid promise scalable quantum networks. Robust and reliable optical properties have so far been restricted to systems with inversion symmetry. Here, we release this stringent constraint by demonstrating outstanding spin of single silicon vacancy centres carbide. Despite lack symmetry, system's particular wave function symmetry decouples its from magnetic electric fields, as well local strain. This provides a high-fidelity spin-to-photon interface...
Abstract The fabrication and functionalization of large‐area graphene its electrocatalytic properties for iodine reduction in a dye‐sensitized solar cell are reported. film, grown by thermal chemical vapor deposition, contains three to five layers monolayer graphene, as confirmed Raman spectroscopy high‐resolution transmission electron microscopy. Further, the film is treated with CF 4 reactive‐ion plasma fluorine ions successfully doped into X‐ray photoelectron UV‐photoemission...
Silicon carbide is a promising platform for single photon sources, quantum bits (qubits), and nanoscale sensors based on individual color centers. Toward this goal, we develop scalable array of nanopillars incorporating silicon vacancy centers in 4H-SiC, readily available efficient interfacing with free-space objective lensed-fibers. A commercially obtained substrate irradiated 2 MeV electron beams to create vacancies. Subsequent lithographic process forms 800 nm tall 400-1400 diameters. We...
Abstract In quantum sensing, precision is typically limited by the maximum time interval over which phase can be accumulated. Memories have been used to enhance this beyond coherence lifetime and thus gain precision. Here, we demonstrate that using a memory an increased sensitivity also achieved. To end, use entanglement in hybrid spin system comprising sensing qubit associated with single nitrogen-vacancy centre diamond. With retain full state even after decay of sensor, enables coherent...
A novel approach for preparation of ultra-bright fluorescent nanodiamonds (fNDs) was developed and the thermal kinetic optimum NV center formation identified. Combined with a new oxidation method, this enabled particles that were roughly one order magnitude brighter than prepared commonly used procedures.
Novel, stimulus-responsive supramolecular structures in the form of fibers, gels, and spheres, derived from an azobenzene-containing benzenetricarboxamide derivative, are described. Self-assembly tris(4-((E)-phenyldiazenyl)phenyl)benzene-1,3,5-tricarboxamide (Azo-1) aqueous organic solvent systems results dependent generation microfibers (aq DMSO), gels DMF), hollow spheres THF). The a single crystal X-ray diffraction analysis Azo-1 (crystallized mixture DMSO H2O) reveal that it possesses...
Abstract The functionality and viability of stored human red blood cells (RBCs) is an important clinical issue in transfusions. To systematically investigate changes whole blood, the hematological properties individual RBCs were quantified samples for various periods with without a preservation solution called citrate phosphate dextrose adenine-1 (CPDA-1). With 3-D quantitative phase imaging techniques, optical measurements refractive index (RI) distributions membrane fluctuations done at...
Substantial progress in flexible or stretchable electronics over the past decade has extensively impacted various technologies such as wearable devices, displays and automotive for smart cars. An important challenge is reliability of these deformable devices under thermal stress. Different coefficients expansion (CTE) between plastic substrates device components, which include multiple inorganic layers metals ceramics, induce stress during fabrication processes long-term operations with...
Color centers with long-lived spins are established platforms for quantum sensing and information applications. exist in different charge states, each of them distinct optical spin properties. Application to technology requires the capability access stabilize states specific task. Here, we investigate state manipulation individual silicon vacancies carbide, a system which has recently shown unique combination long coherence time ultrastable spin-selective transitions. In particular,...
A metal–insulator–metal (MIM) capacitor using ZrO2 on tungsten (W) metal bottom electrode was demonstrated and characterized in this letter. Both W were synthesized by an atomic layer deposition (ALD) method. High-quality 110∼115 Å films grown uniformly ALD ZrCl4 H2O precursors at 300 °C, polycrystalline the regime could be obtained. 13∼14-Å-thick interfacial between observed after fabrication, it identified as WOx through angle-resolved x-ray photoelectron spectroscopy analysis with wet...
Organic semiconductors offer a unique environment to probe the hyperfine coupling of electronic spins nuclear spin bath. We explore interaction in electron-hole pairs presence inhomogeneous fields by monitoring modulation current through an organic light emitting diode under coherent spin-resonant excitation. At weak driving fields, only one two pair precesses. As field exceeds difference local experienced electron and hole, both precess, leading pronounced beating transient Rabi flopping...
Improving the electro-catalytic activity of graphene has recently been subject intense research for high efficiency flexible energy storage and conversion devices. We report synthesis a large scale film by CVD method its functionalization with HNO3 electrochemical electrode in DSSCs. found that on enhances tri-iodide reduction rate three times dye sensitized solar cell compared to pristine graphene. The X-ray photoelectron spectroscopy (XPS) ultra-violet photoemission (UPS) studies confirm...
We report highly efficient perovskite LEDs with a reduced hole injection barrier and improved crystallinity of using PEDOT:MoO<sub>3</sub> composite layer.
Abstract The weak value concept has enabled fundamental studies of quantum measurement and, recently, found potential applications in and classical metrology. However, most experiments reported to date do not require mechanical descriptions, as they only exploit the wave nature physical systems. In this work, we demonstrate sequential two incompatible observables by making use two-photon interference so that results can be explained physically. We then used perform direct process tomography...
In this paper, we study the electron spin decoherence of single defects in silicon carbide (SiC) nuclear bath. We find that, although natural abundance $^{29}\rm{Si}$ ($p_{\rm{Si}}=4.7\%$) is about 4 times larger than that $^{13}{\rm C}$ ($p_{\rm{C}}=1.1\%$), coherence time defect centers SiC bath strong magnetic field ($B>300~\rm{Gauss}$) longer nitrogen-vacancy (NV) diamond. The reason for counter-intuitive result suppression heteronuclear-spin flip-flop process finite field. Our results...
The spins of point defects in silicon carbide are promising candidates for qubits and sensors under $a\phantom{\rule{0}{0ex}}m\phantom{\rule{0}{0ex}}b\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}t$ conditions. Unlike defect-bearing diamond, SiC is regarded as an industry-friendly platform, with existing market high-purity wafers a mature fabrication technology. authors detect the magnitude direction magnetic field using resonance optical...
Semiconductor defects allowing efficient interaction between spins and photons can serve as building blocks for scalable quantum networks. The silicon vacancy (${V}_{\text{Si}}$) in SiC possesses controllable, long-lived ground-state spins, adjustable fluorescence properties. However, its broad distribution of emitted-photon energies at room temperature means ${V}_{\text{Si}}$'s feasibility needs to be checked liquid-helium temperature, where phonon coupling is suppressed. This study finds a...
Quantum technology relies on proper hardware, enabling coherent quantum state control as well efficient readout. In this regard, wide-bandgap semiconductors are an emerging material platform with scalable wafer fabrication methods, hosting several promising spin-active point defects. Conventional readout protocols for such defect spins rely fluorescence detection and limited by a low photon collection efficiency. Here, we demonstrate photo-electrical technique electron of silicon vacancy...
Scalable spin-to-photon interfaces require quantum emitters with strong optical transition dipole moment and low coupling to phonons stray electric fields. It is known that particularly for fields, these conditions can be simultaneously satisfied show inversion symmetry. Here, we symmetry not a prerequisite criterion spectrally stable emitter. We find identical electron density in ground excited states eliminate the Further, achieved systems altering sign of wavefunctions. use functional...