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Applied Physics Express
Scopus
ISSN 1882-0786 · IOP Publishing · 458 artikel di indeks
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Artikel Jurnal
Experimental investigation of exciton dynamics of thermally activated delayed fluorescence material exhibiting mono-exponential transient PL decay with sub-microsecond lifetime in solution
DMAc-sFL-PN is a reported emitter exhibiting an ultrashort emission lifetime via the triplet state with high oxygen sensitivity in toluene, explained by a direct singlet-harvesting mechanism. We comprehensively investigated the detailed emission mechanisms of DMAc-sFL-PN and its derivatives…
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Artikel Jurnal
Unique Pt–C coordination on inner SWCNT surfaces enhances stability of confined Pt nanoparticles
Encapsulation of Pt nanoparticles within single-walled carbon nanotubes (SWCNTs) is examined as a route to stabilizing sub-2 nm clusters. A sequential process—acid-reflux opening, solution-plasma reduction, and reductive annealing—yields uniform Pt filling. TEM confirms one-dimensional confinement…
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Artikel Jurnal
Resolution limits due to ellipticity in submicron photoalignment with Berry-phase photomasks
Photoalignment using Berry-phase masks enables single-step transfer of complex liquid crystal (LC) patterns but faces difficulty in reproducing submicrometer patterns. In this study, the physical limitation using Berry-phase masks is elucidated through combined simulations and experiments…
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Artikel Jurnal
From mathematical order to functional materials: new developments in thermal transport engineering
Mathematical order such as the golden ratio, Fibonacci sequences, and other quasiperiodic or aperiodic patterns provide a compact design language for functional matter. This review traces their role from describing non-periodic order in quasicrystals, fractals, and optical systems to actively…
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Artikel Jurnal
Extremely small trap concentrations in high-purity n-type GaN grown by quartz-free hydride vapor phase epitaxy
Trap characterization was performed for n-type GaN grown by the quartz-free hydride vapor phase epitaxy method with a newly developed reactor. Deep-level transient spectroscopy revealed several electron and hole traps within 1 eV of the conduction and valence band edges. All were present at low…
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Artikel Jurnal
Evaluation of etching damage of unintentionally doped GaN by C–V characteristics for charge balance evaluation of polarization superjunction GaN FET
The plasma etching of GaN induces an n-type surface conductive layer (SCL) that may disrupt the charge balance of the polarization superjunction structure formed by the polarization charge. We report a nondestructive method to quantify this damage using gate–drain C – V measurements and…
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Artikel Jurnal
Abrasion-resistant on-skin electrodes by high-toughness and skin-conformable elastomeric substrates
Ultrathin, skin-conformal electrodes provide a secure, comfortable fit and enable continuous electrophysiological monitoring in daily lives. However, friction-induced damage from contact with skin or clothing made daily use difficult. Here, we demonstrate a facile fabrication of ultrathin on-skin…
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Artikel Jurnal
GaN-based MIS HEMT with SiAlN gate dielectric achieving over 70% PAE and 10 W mm−1 at 8 GHz
We achieved a simultaneous record-high power-added efficiency (PAE) of 71.4% and an output power density of 10.4 W mm ^−1 at 8 GHz in an AlGaN/GaN metal-insulator-semiconductor (MIS) high-electron-mobility transistor (HEMT) on a free-standing GaN substrate, utilizing SiAlN as the gate dielectric…
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Artikel Jurnal
Field plate multi-finger diamond MOSFET with ampere-class current capability and a breakdown voltage of 550 V
The field plate structure is an effective technique for improving breakdown characteristics. In this work, the gate field plate (GFP) diamond MOSFET with both ampere-class current capability and high breakdown voltage is demonstrated for the first time. The maximum drain current of the fabricated…
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Artikel Jurnal
Recent advances in terahertz parametric generation and detection using lithium niobate
We have advanced the research and development of injection-seeded terahertz (THz) parametric generation and detection as a widely tunable, and coherent THz wave source and receiver, and have applied this technology to non-destructive spectroscopy and imaging through thick shielding materials. In…
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Artikel Jurnal
Large enhancement of interlayer chiral coupling in sub-micron-scale magnetic tunnel junctions
We have investigated the interlayer chiral coupling (ICC) phenomenon, which occurs via the interlayer Dzyaloshinskii–Moriya interaction, in a ferromagnet/non-magnet/ferromagnet tri-layer structure using sub-micron-sized magnetic tunnel junctions. The tri-layer films were fabricated into sub-micron…
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Artikel Jurnal
A method for dielectric characterization at extreme high temperature based on multi-mode spoof localized surface plasmons
Extreme-high-temperature dielectric characterization is challenging and costly. In this work, the spoof localized surface plasmons (SLSPs) are introduced for the detection of high-temperature dielectric constant of ceramic materials. Confinement of electromagnetic fields and strong correlation…
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Artikel Jurnal
Resonant tunneling diode integrated with an extremely short focal length polarization-independent collimating metalens
Terahertz continuous-wave sources have been rapidly developed to cover the terahertz gap. However, integrating metasurface-based optical elements with sources remains limited due to the challenges of simultaneously designing multiple optical properties. Here, we demonstrate a 1.0-mm extremely short…
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Artikel Jurnal
Recent advances in the physics of Dirac plasmons in graphene and related 2D materials and their THz device applications
The terahertz (THz) frequency range (0.1–10 THz) bridges the electronic and photonic spectral domains and offers key opportunities for high-speed communication, sensing, and spectroscopy. However, the realization of compact, coherent, and room-temperature THz sources and detectors remains still a…
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Artikel Jurnal
Anisotropic domain wall dynamics in perpendicularly magnetized Pt/Co/Ta multilayers with a lateral symmetry breaking
Magnetic racetrack devices are promising candidates for next-generation spintronic memories formed in ferromagnet/heavy metal thin-film systems exhibiting perpendicular magnetic anisotropy. Information is stored in chiral Néel-type domain walls (DWs) stabilized by interfacial Dzyaloshinskii–Moriya…
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Artikel Jurnal
Theoretical advances in resonance Raman spectroscopy of solids
In this review, we summarize recent progress in the first-principles calculation of resonant Raman spectra in solids. We begin by describing methods for computing Raman spectra using tight-binding and plane-wave approaches. We then review our recent software packages, QER aman and QR ^2 -code, and…
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Artikel Jurnal
A critical review of Mg3Sb2-based thermoelectric materials
Mg _3 Sb _2 -based materials have emerged as highly promising n -type thermoelectric materials within the medium temperature range (300–800 K), offering a more cost-effective and environmentally benign alternative to conventional telluride-based thermoelectric materials. These materials complement…
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Artikel Jurnal
Design principles for optimizing pyroelectric responses of doped HfO2
Ferroelectric HfO _2 is an emerging pyroelectric material with promising energy-harvesting applications. Herein, via ab-initio molecular dynamics simulations, we investigate the role of dopants in tailoring the pyroelectricity in ferroelectric HfO _2 . We demonstrate that dopant perturbs the local…
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Artikel Jurnal
Quantum dot single photon source on SiN integrated with coupled crossover waveguides
Hybrid integration of InAs/GaAs quantum dot (QD) single-photon sources (SPSs) is a promising approach for introducing quantum light into SiN photonic integrated circuits. However, the large refractive-index mismatch between GaAs and SiN poses a challenge for efficient optical coupling. Here, we…
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Artikel Jurnal
Amplification of gain-switched pulses in semiconductor optical amplifier
We investigated the amplification of picosecond gain-switched laser diode (ps-GSLD) pulses using a semiconductor optical amplifier (SOA). Amplified pulses were characterized using a conventional sampling oscilloscope and an up-conversion time microscope. While sampling measurements showed apparent…