Article
Chemistry, Multidisciplinary
Ryoma Hayakawa, Kosuke Honma, Shu Nakaharai, Kaname Kanai, Yutaka Wakayama
Summary: Multiple logic gate operations are achieved using a dual-gate organic antiambipolar transistor, enabling the realization of new computation architectures. This transistor exhibits a distinct feature of precisely tuned peak voltage of the drain current, based on three input signals. The device concept shows promise in surpassing the current limitations in complementary metal-oxide-semiconductor devices.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Songyang Guo, Hao Xu, Yiqiang Zheng, Linlin Li, Zhexin Li, Lei Zhang, Huibin Zhang, Xianbao Wang, Jinhua Li, Lili Wang, Liyuan Liu, Zheng Lou
Summary: We propose a stretchable photo-sensing logic gate based on the organic semiconductor DPP-DTT, which can achieve NOR logic gate function with the near infrared (NIR) light as input signal. Compared to conventional logic circuits, this system reduces transistor utilization and introduces NIR light to maximize and simplify the functionality of scalable photo-sensing logic circuits.
Article
Chemistry, Multidisciplinary
Siva Pratap Reddy Mallem, Peddathimula Puneetha, Yeojin Choi, Seung Mun Baek, Sung Jin An, Ki-Sik Im
Summary: Understanding the carrier transport mechanisms in nanowires is crucial for the creation of next-generation nanoscale devices. In this study, the effects of temperature on GaN nanowire wrap-gate transistors (WGTs) made via a top-down technique were examined. The predicted conductance in this transistor remains unchanged up to a temperature of 240 K and then increases as the temperature rises. Different behaviors were observed at different gate voltages, suggesting the presence of phonon and impurity scattering processes on the surface or core of GaN nanowires.
Article
Multidisciplinary Sciences
Elliot J. Connors, J. Nelson, Lisa F. Edge, John M. Nichol
Summary: The authors report the results of charge noise spectroscopy for electron spin qubits in silicon quantum dots, spanning nearly twelve decades in frequency. The charge noise can be accurately characterized using simple transport measurements over a wide frequency range in Si/SiGe quantum dots.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Biswajit Pal, Kalyan Jyoti Sarkar, Sourav Das, P. Banerji
Summary: The study investigated the photodetection properties of a core-shell nanowire heterojunction device based on p-Si/n-InP, showing promising performance in the NIR spectral region.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Xinpei Duan, Zhenyu Yang, Jun Lin, Hao Huang, Guoli Li, Da Wan, Xuming Zou, Jingwei Bai, Jinshui Miao, Lei Liao, Xingqiang Liu
Summary: Tailoring MoS2 into nanoribbon shape allows efficient regulation of electrical properties and fabrication of high-performance transistors. The quasi-3D channel geometry enhances gate modulation capability and improves device electrical performance. The constructed logic gates based on this structure demonstrate robust logic circuits.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Optics
Hongyi Meng
Summary: A general scheme for linear-optical quantum control gates, including controlled-NOT and controlled-SWAP gates, is presented. The scheme utilizes polarization-path-entangled photon pairs to encode and control qubits, eliminating the need for ancilla photons or nonlinear operations, and achieving high fidelity under realistic conditions.
Article
Engineering, Electrical & Electronic
Xuan Hu, Amy S. Abraham, Jean Anne C. Incorvia, Joseph S. Friedman
Summary: The study introduces a new hybrid ambipolar-PTL logic family that combines the compact logic of PTL with the ambipolar capabilities of ambipolar field-effect transistors, aiming to enhance overall system efficiency.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2021)
Article
Engineering, Electrical & Electronic
Michael Cholines Pedapudi, Jay Chandra Dhar
Summary: A highly sensitive UV-C photodetector based on beta-Ga2O3 nanowires was fabricated, showing good photo absorption and emission properties. It operated efficiently in the UV-C region with high responsivity, detectivity, and low noise equivalent power. The device also demonstrated fast transient response times due to the strong p-n junction.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Multidisciplinary Sciences
Iman Chahardah Cherik, Saeed Mohammadi, Subir Kumar Maity
Summary: This paper presents a vertical tunneling field effect transistor with a doping-less tunneling heterojunction and an n(+)-drain. The optimized electrostatic control over the channel is achieved through a double gate configuration and Hafnium in the gate oxide. Numerical simulations and evaluations of non-idealities demonstrate that the proposed device is a notable candidate for both DC and RF applications.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Mohit Kumar, Jaeseong Lim, Hyunwoo Kang, Sangwan Kim, Hyungtak Seo
Summary: This study demonstrates the development of photon-triggered, self-biased graphene-based electronic circuits that can operate in a wide spectral range. The proposed devices, including various transistors and logic gates, exhibit fast temporal processing and have potential applications in high-speed neuromorphic sensing.
Article
Chemistry, Multidisciplinary
Ling Chen, Bowen Sheng, Shanshan Sheng, Ping Wang, Xiaoxiao Sun, Duo Li, Tao Wang, Renchun Tao, Shangfeng Liu, Zhaoying Chen, Weikun Ge, Bo Shen, Xinqiang Wang
Summary: This study demonstrates the room temperature triggered single photon emission from self-assembled GaN quantum dots embedded in AlN nanowires grown on Si (111) substrate. The GaN/AlN QDs exhibit strong emission in the range of 3.6-4.1 eV at 4.7 K, with a sharp emission width as narrow as 1.6 meV. The fast radiative lifetime and observable antibunching effect up to room temperature confirm the potential of practical quantum information applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xuan Wang, Yehua Tang, Wanping Wang, Hao Zhao, Yanling Song, Chaoyang Kang, Kefan Wang
Summary: In this study, Bi2Se3 film was deposited onto silicon nanowires using vacuum evaporation method to create a bulk heterojunction, resulting in a self-powered photodetector with a wide detection range and fast response speed. This silicon-based photodetector shows promise for near- and mid-infrared applications, making it a potential candidate for future optoelectronic devices.
Article
Materials Science, Multidisciplinary
Marko Milivojevic
Summary: Strong, direct Rashba spin-orbit coupling in Si, Ge, and Ge/Si core/shell nanowire quantum dots allows for electrical manipulation of the hole spin qubit. The study shows that quantum dots in nanowires with circular cross sections enable weaker driving of the hole spin qubit compared to those in square profile nanowires. The global maximum of the Rabi frequency is found in Si square profile nanowire quantum dots, making them more effective in creating the hole spin qubit.
Article
Physics, Applied
Rui-Zi Hu, Rong-Long Ma, Ming Ni, Yuan Zhou, Ning Chu, Wei-Zhu Liao, Zhen-Zhen Kong, Gang Cao, Gui-Lei Wang, Hai-Ou Li, Guo-Ping Guo
Summary: Spin qubits based on silicon metal-oxide semiconductor (Si-MOS) quantum dots are a promising platform for large-scale quantum computers. Flopping-mode electric dipole spin resonance has been realized in Si/SiGe quantum dots by delocalizing an electron across a double quantum dots charge state. In this study, we demonstrate a flopping-mode spin qubit in a Si-MOS quantum dot via Elzerman single-shot readout. Our results show improved spin resonance frequencies, spin Rabi frequencies, and spin dephasing times, providing a route to large-scale spin qubit systems with higher control fidelity in Si-MOS quantum dots.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Seunghoon Yang, Janghwan Cha, Jong Chan Kim, Donghun Lee, Woong Huh, Yoonseok Kim, Seong Won Lee, Hong-Gyu Park, Hu Young Jeong, Suklyun Hong, Gwan-Hyoung Lee, Chul-Ho Lee
Article
Optics
Daria Smirnova, Aditya Tripathi, Sergey Kruk, Min-Soo Hwang, Ha-Reem Kim, Hong-Gyu Park, Yuri Kivshar
LIGHT-SCIENCE & APPLICATIONS
(2020)
Article
Chemistry, Physical
Nguyen Xuan Viet Lan, Jeongbin Moon, Tae Hui Kang, Ke Wang, Hong-Gyu Park, Gi-Ra Yi
Summary: Composite colloidal crystal films were prepared to demonstrate strong reflection colors while maintaining high optical transparency by adjusting the core-to-shell volume ratio for refractive index matching. Bicolored reflective films were successfully prepared by stacking two different colloidal crystal films, and patterned composite photonic crystals were fabricated through selective photopolymerization for multicolored films, showing potential applications in reflective displays, encryption, and optical identification.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Elizaveta Melik-Gaykazyan, Kirill Koshelev, Jae-Hyuck Choi, Sergey S. Kruk, Andrey Bogdanov, Hong-Gyu Park, Yuri Kivshar
Summary: There is a close connection between Fano and quasi-BIC resonances in high-index dielectric nanostructures, which show great potential for applications in nanoscale lasers and sensors. Our experimental results demonstrate the relationship and suggest a unified approach for analyzing sharp resonances in subwavelength nanostructures.
Article
Chemistry, Multidisciplinary
Kristina Frizyuk, Elizaveta Melik-Gaykazyan, Jae-Hyuck Choi, Mihail Petrov, Hong-Gyu Park, Yuri Kivshar
Summary: The study focused on the nonlinear response of a dimer composed of two identical Mie-resonant dielectric nanoparticles illuminated normally by circularly polarized light. A general theory describing hybridization of multipolar modes of the coupled nanoparticles was developed, revealing nonvanishing nonlinear circular dichroism (CD) in the second-harmonic generation (SHG) signal enhanced by the multipolar resonances in the dimer. Experimental results obtained for the AlGaAs dimers placed on an engineered substrate supported the multipolar hybridization theory.
Article
Chemistry, Multidisciplinary
Jung Min Lee, Dingchang Lin, Ha-Reem Kim, Young-Woo Pyo, Guosong Hong, Charles M. Lieber, Hong-Gyu Park
Summary: The study introduces a tissue-like optoelectronic mesh that allows high-resolution optical stimulation and sampling of optically evoked neural activities, which can be utilized for studying neural circuits and treating brain disorders.
Article
Chemistry, Multidisciplinary
Aditya Tripathi, Ha-Reem Kim, Pavel Tonkaev, Soon-Jae Lee, Sergey Makarov, Sergey S. Kruk, Mikhail Rybin, Hong-Gyu Park, Yuri Kivshar
Summary: Active dielectric metasurfaces composed of split-nanodisk resonators fabricated in InGaAsP membranes with embedded quantum wells were studied. These split-nanodisk resonators can operate in the optical anapole regime, supporting strongly localized fields and high-Q resonances. Room-temperature lasing was demonstrated from the anapole lattices of engineered active metasurfaces with low threshold and high coherence.
Article
Multidisciplinary Sciences
Min-Soo Hwang, Hoo-Cheol Lee, Kyoung-Ho Kim, Kwang-Yong Jeong, Soon-Hong Kwon, Kirill Koshelev, Yuri Kivshar, Hong-Gyu Park
Summary: By merging symmetry-protected and accidental bound states in the continuum, an efficient laser with significantly reduced threshold, substantially increased quality factor, and shrunken far-field images can be realized. The study provides a route for nanolasers with reduced out-of-plane losses in finite-size active nanodevices and improved lasing characteristics.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Anastasiia Zalogina, Pavel Tonkaev, Aditya Tripathi, Hoo-Cheol Lee, Luca Carletti, Hong-Gyu Park, Sergey S. Kruk, Yuri Kivshar
Summary: Multiphoton processes of absorption photoluminescence have found diverse applications ranging from threedimensional microfabrication to biological imaging. However, studying higher-order photoluminescence processes at subwavelength scales has been challenging due to their low efficiency. In this study, we demonstrate the observation of five-photon luminescence from a single subwavelength nanoantenna at room temperature, enabled by the Mie resonances. The interaction of Mie multipolar modes at the subwavelength scale enhances the efficiency of five-photon luminescence by at least 4 orders of magnitude.
Article
Chemistry, Physical
Dong-Wook Lee, Dong-Hyun Kim, Jin-Young Oh, Dae-Hyun Kim, Se-Hoon Choi, Jin-Ah Kim, Hong-Gyu Park, Dae-Shik Seo
Summary: An efficient alignment method for liquid crystals (LCs) was proposed, using a brush-coating method for film deposition and LC alignment treatment simultaneously. The study found that brush-coated LaYSrO films showed nano/microstructure, which resulted in a uniform LC alignment state.
Article
Crystallography
Hong-Gyu Park, Jin-Ah Kim, Bong-Jin Ko
Summary: This study investigated the liquid crystal alignment characteristics of solution-derived ZnO films and found that the number of rubbing iterations had little effect on the alignment. The surface energy and polar energy of the rubbed ZnO films increased as the number of iterations increased. Rubbed ZnO films showed improved LC alignment compared to polyimide films and can be used as a substitute alignment film. It is also suitable for LC-based virtual reality/augmented reality display systems that require fast response times.
Article
Multidisciplinary Sciences
Jung Min Lee, Young-Woo Pyo, Yeon Jun Kim, Jin Hee Hong, Yonghyeon Jo, Wonshik Choi, Dingchang Lin, Hong-Gyu Park
Summary: This study presents an ultra-thin, minimally invasive neural probe called NeuroWeb, which combines the advantages of surface electrode arrays and implantable multi-electrode arrays. In vivo experiments demonstrate its ability to detect stable single-unit activity of neurons with high signal-to-noise ratios. The researchers also investigate neural interactions between brain regions using transparent dual NeuroWebs and optical stimulation. This study provides insights into complex brain networks through optical and electrophysiological mapping.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Min-Soo Hwang, Hong-Gyu Park
Summary: Lithographically designed potential wells in monolayer WS2 microcavities can manipulate nonlinear transition-metal dichalcogenide polaritons and enhance the interaction strength between polaritons and the reservoir.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Min-Soo Hwang, Jae-Hyuck Choi, Kwang-Yong Jeong, Kyoung-Ho Kim, Ha-Reem Kim, Jae-Pil So, Hoo-Cheol Lee, Jungkil Kim, Soon-Hong Kwon, Hong-Gyu Park
Summary: High quality factor and small mode volume in nanocavities enable efficient nanophotonic devices with low power consumption, strong nonlinearity, and high modulation speed. Single nanocavity designs include semiconductor nanowires, plasmonic cavities, and quasi-bound states in the continuum (quasi-BIC); nanocavity array designs include BIC cavities, parity-time symmetry coupled cavities, and photonic topological cavities, offering various options for laser applications.
CHEMICAL COMMUNICATIONS
(2021)