Output
-
2025 Kawakami Lab.
- Design and implementation of opto-electrical hybrid floating-point multipliers
- Takumi Inaba, Takatsugu Ono, Koji Inoue and Satoshi Kawakami
IEICE Transactions on Information and Systems, vol.E108-D, No.1, pp.-, Jan. 2025.
-
2024 Yajima Lab.
- Real-time information processing via volatile resistance change in scalable protonic devices
- Satya Prakash Pati, Yifan Geng, Satoshi Hamasuna, Kantaro Fujiwara, Tetsuya Iizuka, Hisashi Inoue, Isao Inoue, Takeaki Yajima
Communications Materials 5(1) Dec.2024
- Review of solid-state proton devices for neuromorphic information processing
- Satya Prakash Pati, Takeaki Yajima
Japanese Journal of Applied Physics 63(3) 030801-030801 Mar.2024
-
2024 Kawakami Lab.
- Open-Source Silicon—Unleashing Innovation and Collaboration
- M. Guthaus, K. Kim, F. Brito-Filho, S. Kawakami and B. Murmann
IEEE Design & Test, vol. 41, no. 6, pp. 5-7, Dec. 2024.
- Evaluation of photonic approximate reservoir computing through quantization
- Tatsuki Ito,Kanno Kazutaka, Satoshi Kawakami and Atsushi Uchida
In Proceedings of International Symposium on Nonlinear Theory and Its Applications (NOLTA), pp.X-X, Dec. 2024.
- Performance evaluation of approximate reservoir computing with a semiconductor laser
- Tatsuki Ito,Kanno Kazutaka, Satoshi Kawakami and Atsushi Uchida
In Proceedings of International Symposium on Physics and Applications of Laser Dynamics (IS-PALD), pp.X-X, Nov. 2024.
- Late Breaking Results: Single Flux Quantum based Brownian Circuits for Ultra-Low-Power Computing
- Satoshi Kawakami, Yusuke Ohtsubo, Koji Inoue and Masamitsu Tanaka
In Proceedings of Design, Automation & Test in Europe Conference & Exhibition (DATE), 2024 [to appear]
- Research on optical computing system architecture for simple recurrent neural networks
- Satoshi Kawakami
Impact, vol. 2024, no. 1, 2024
- RTL Design of Surface Code Decoder for Error Tolerant Quantum Computers on Cryogenic Nonvolatile FPGAs
- Tesshu Nakamura, Makoto Miyamura, Koji Inoue, Satoshi Kawakami, Toshitsugu Sakamoto, Munehiro Tada and Teruo Tanimoto
In IPSJ Transaction ACS, vol.XX, pp. xxx-xxx, 2024
- Photonic Compute-in-Wire: Remotely Driven Photonic Deep Neural Network with Single Modulated Nonlinear Feedback Loop
- Mitsumasa Nakajima, Satoshi Kawakami, Katsuma Inoue, Kohei Nakajima and Toshikazu Hashimoto
Advanced Devices & Instrumentation – a Science Partner Journal, 2024
-
2023 Yajima & Kawakami Lab
- Design of The Ultra-Low-Power Driven VMM Configurations for uW Scale IoT Device
- Keisuke Takano, Takeaki Yajima and Satoshi Kawakami
In Proceedings of the IEEE International Symposium on Embedded Multicore/Many-core Systems-on-Chip (MCSoC), pp.65-72, Dec. 2023
-
2023 Yajima Lab.
- Resonant frequency modulation in inductive vibration power generator via resistive impedance control
- Takeaki Yajima
IEEE Transactions on Power Electronics 39(1) 1269-1278 Dec.2023
- Zero-dimensionality of a scaled-down VO2 metal-insulator transition via high-resolution electrostatic gating
- Takeaki Yajima, Yusuke Samata, Satoshi Hamasuna, Satya Prakash Pati, Akira Toriumi
NPG Asia Materials, 15 39-1-39-6, Jun, 2023
- CMOS-based area-and-power-efficient neuron and synapse circuits for time-domain analog spiking neural networks
- Xiangyu Chen, Zolboo Byambadorj, Takeaki Yajima, Hisashi Inoue, Isao H. Inoue, Tetsuya Iizuka
Applied Physics Letters, 122 074102, Feb, 2023
-
2023 Kawakami Lab.
- Gate-level-pipeline SFQ circuits for high-throughput floating-point arithmetic
- Masamitsu Tanaka, Ikki Nagaoka, Satoshi Kawakami, Teruo Tanimoto, Takatugu Ono, Koji Inoue, and Akira Fujimaki
The European Conference on Applied Superconductivity (EUCAS), Sep. 2023
- RTL Design of Surface Code Decoder for Error Tolerant Quantum Computers on Cryogenic Nonvolatile FPGAs
- Tesshu Nakamura, Makoto Miyamura, Koji Inoue, Satoshi Kawakami, Toshitsugu Sakamoto, Munehiro Tada and Teruo Tanimoto
The cross-disciplinary Workshop on Computing Systems, Infrastructures, and Programming (xSIG), Jul. 2023
- Dynamically Reconfigurable Decoder Architecture for Adaptive Error Correction Using Cryogenic Non-Volatile FPGAs
- Tesshu Nakamura, Makoto Miyamura, Koji Inoue, Satoshi Kawakami, Toshitsugu Sakamoto, Munehiro Tada and Teruo Tanimoto
In Proceedings of the Workshop: I too can Quantum (I2Q), Jun. 2023
- 50-GFLOPS Floating-Point Adder and Multiplier Using Gate-Level-Pipelined Single-Flux-Quantum Logic with Frequency-Increased Clock Distribution
- Ikki Nagaoka, Ryota Kashima, Masamitsu Tanaka, Satoshi Kawakami, Teruo Tanimoto, Taro Yamashita, Koji Inoue, and Akira Fujimaki
in the IEEE Transactions on Applied Superconductivity, vol. 33, no. 4, pp. 1-11, Jun. 2023
- Empirical Power-Performance Analysis of Layer-wise CNN Inference on Single Board Computers
- Kuan Yi Ng, Aalaa M.A. Babai, Teruo Tanimoto, Satoshi Kawakami and Koji Inoue
In IPSJ Transaction ACS, vol.31, pp. 478-494, 2023
-
2022 Yajima Lab.
- Controlling proton volatility in SiO2-capped TiO2 thin films for neuromorphic functionality [Editor’s Pick]
- T. Yajima, S. P. Pati
Applied Physics Letters, 120(24) 241601-241601, Jun 13, 2022
- Self-synchronized Rectifier with Phase Information Extracted from Vibration Energy Harvester
- Hang Yin, Takeaki Yajima
Sensors and Materials, 34(5) 1899-1907, May, 2022
- An ultra-compact leaky integrate-and-fire neuron with long and tunable time constant utilizing pseudo resistors for spiking neural networks
- Xiangyu Chen, Takeaki Yajima, Isao H. Inoue, Tetsuya Iizuka
Japanese Journal of Applied Physics, 61(SC) SC1051-SC1051, May 1, 2022
- Ultra-low-power switching circuits based on a binary pattern generator with spiking neurons
- Takeaki Yajima
Scientific Reports, 12 1150, Jan, 2022
Kyushu University Pre-release, JST Pre-release, JST news Apr., ihon Keizai Shimbun(Japanese newspaper), Science Japan
-
2022 Kawakami Lab.
- A Hybrid Opto-Electrical Floating-point Multiplier
- Takumi Inaba, Takatsugu Ono, Koji Inoue and Satoshi Kawakami
In Proceedings of the IEEE International Symposium on Embedded Multicore/Many-core Systems-on-Chip (MCSoC), pp.313-320, Dec. 2022
- Design and Analysis of a Nano-photonic Processing Unit for Low-Latency Recurrent Neural Network Applications
- Eito Sato, Koji Inoue and Satoshi Kawakami
In Proceedings of the IEEE International Symposium on Embedded Multicore/Many-core Systems-on-Chip (MCSoC), pp.321-329, Dec. 2022
- An Edge Autonomous Lamp Control with Camera Feedback
- Satoshi Matsushita, Teruo Tanimoto, Satoshi Kawakami, Takatsugu Ono, Koji Inoue
In Proceedings of the IEEE World Forum on Internet of Things (WF-IoT), Tech-01-6, Oct. 26th — Nob. 11th, 2022
- Layer-wise power/performance analysis for single-board CNN inference
- Kuan Yi Ng, Aalaa M.A. Babai, Satoshi Kawakami, Teruo Tanimoto and Koji Inoue
The cross-disciplinary Workshop on Computing Systems, Infrastructures, and Programming (xSIG), Jul. 2022
- Design of Variable Bit-Width Arithmetic Unit Using Single Flux Quantum Device
- Iori Ishikawa, Koki Ishida, Masamitsu Tanaka, Ikki Nagaoka, Satoshi Kawakami, Teruo Tanimoto, Akira Fujimaki and Koji Inoue
In Proceedings of IEEE International Symposium on Circuits & Systems (ISCAS), pp.3547-3551, May 2022
-
2021 Yajima Lab.
- Observation of the Pinch‐Off Effect during Electrostatically Gating the Metal‐Insulator Transition
- Takeaki Yajima, Akira Toriumi
Advanced Electronic Materials, 2100842-2100842, Nov 21, 2021
- Temperature dependence of resistivity increases induced by thiols adsorption in gold nanosheets
- Taro Kato, Takahisa Tanaka, Takeaki Yajima, Ken Uchida
Japanese Journal of Applied Physics, 60(SB) SBBH13-SBBH13, Feb 3, 2021
- Atomistic simulation study of impacts of surface carrier scatterings on carrier transport in Pt nanosheets
- Takahisa Tanaka, Taro Kato, Takeaki Yajima, Ken Uchida
IEEE Electron Device Letters, 1-1, 2021
-
2021 Kawakami Lab.
- Reducing a position map size of Oblivious RAM for implementing on microprocessors
- Daisuke Yamagata, Satoshi Kawakami, Teruo Tanimoto, Koji Inoue and Takatsugu Ono
In Proceedings of the Symposium on Cryptography and Information Security (SCIS), Jan. 2021
- Superconductor Computing for Neural Networks
- Koki Ishida, Ilkwon Byun, Ikki Nagaoka, Kousuke Fukumitsu, Masamitsu Tanaka, Satoshi Kawakami, Teruo Tanimoto, Takatsugu Ono, Jangwoo Kim, and Koji Inoue
in IEEE Micro, vol.41, Issue 3, pp. 19-26, May-June 2021
-
2020 Yajima Lab.
- Regulating phase transformation kinetics via redox reaction in ferroelectric Ge-doped HfO2
- T. Yajima, T. Nishimura, S. Migita, T. Tanaka, K. Uchida, A. Toriumi
Applied Physics Letters, 117(18) 182902-182902, Nov 2, 2020
- Modulation of VO 2 Metal–Insulator Transition by Ferroelectric HfO 2 Gate Insulator
- Takeaki Yajima, Tomonori Nishimura, Takahisa Tanaka, Ken Uchida, Akira Toriumi
Advanced Electronic Materials, 6(5) 1901356-1901356, May, 2020
- Impact of defects in self-assembled monolayer on humidity sensing by molecular functionalized transistors
- T. Tanaka, T. Yajima, K. Uchida
Jpn. J. Appl. Phys., Mar, 2020
- Understanding of Fermi level pinning at metal/germanium interface based on semiconductor structure
- X. Lu, T. Nishimura, T. Yajima, A. Toriumi
APEX, 13 031003, Mar, 2020
- Reaction of GeO2 with Ge and crystallization of GeO2 on Ge
- M. Xie, T. Nishimura, T. Yajima, A. Toriumi
J. Appl. Phys., 127 024101, Feb, 2020
- Study on Circuit Technologies Using Metal-Insulator Transition Materials
- Takeaki Yajima
IEICE JPN Ed., J103-C(10) 420-427, 2020
-
2020 Kawakami Lab.
- Architecting an Extremely Fast Neural Processing Unit Using Superconducting Logic Devices
- Koki Ishida, Ilkwon Byun, Ikki Nagaoka, Kousuke Fukumitsu, Masamitsu Tanaka, Satoshi Kawakami, Teruo Tanimoto, Takatsugu Ono, Jangwoo Kim, and Koji Inoue
In Proceedings of IEEE/ACM International Symposium on Microarchtecture (MICRO-53), pp.58 – 72, Oct. 2020
- How many trials do we need for reliable NISQ computing?
- Teruo Tanimoto, Shuhei Matsuo, Satoshi Kawakami, Yutaka Tabuchi, Masuo Hirokawa and Koji Inoue
In Proceedings of the Quantum Computing Workshop (QCW) in conjunction with the IEEE Computer Society Annual Symposium on VLSI (ISVLSI), pp.288 – 290, Aug. 2020
- Practical Error Modeling Toward Realistic NISQ Simulatio
- Teruo Tanimoto, Shuhei Matsuo, Satoshi Kawakami, Yutaka Tabuchi, Masuo Hirokawa and Koji Inoue
In Proceedings of the Quantum Computing Workshop (QCW) in conjunction with the IEEE Computer Society Annual Symposium on VLSI (ISVLSI), pp.291 – 293, Aug. 2020
- 32 GHz 6.5 mW Gate-Level-Pipelined 4-bit Processor using Superconductor Single-Flux-Quantum Logic
- Koki Ishida, Masamitsu Tanaka, Ikki Nagaoka, Takatsugu Ono, Satoshi Kawakami, Teruo Tanimoto, Akira Fujimaki and Koji Inoue
In Proceedings of IEEE 2020 Symposium on VLSI Technology and Circuits (ISSCC), pp.1-2, June 2020
- Enhancing a manycore-oriented compressed cache for GPGPU
- Keitaro Oka, Satoshi Kawakami, Teruo Tanimoto, Takatsugu Ono and Koji Inoue
In Proceedings of the International Conference on High Performance Computing in Asia-Pacific (HPCAsia), pp.22 – 31, Jan. 2020【Best Paper Finalists】
-
2019 Yajima Lab.
- Heteroepitaxial vertical perovskite hot-electron transistors down to the monolayer limit.
- B. Kim, Y. Hikita, T. Yajima, H. Hwang
Nature Commun., 10 5312, Dec, 2019
- High-speed low-energy heat signal processing via digital-compatible binary switch with metal-insulator transitions.
- T. Yajima, T. Tanaka, Y. Samata, K. Uchida, A. Toriumi
International Electron Devices Meeting (IEDM), 903-906, Dec, 2019
- Electron‐Doping Mottronics in Strongly Correlated Perovskite
- J. Chen, W. Mao, L. Gao, F. Yan, T. Yajima, N. Chen, Z. Chen, H. Dong, B. Ge, P. Zhang, X. Cao, M. Silde, Y. Jiang, T. Terai, J. Shi
Adv. Mater., 32(6) 1905060, Dec, 2019
- Almost pinning-free bismuth/Ge and/Si interfaces
- Tomonori Nishimura, Xuan Luo, Soshi Matsumoto, Takeaki Yajima, Akira Toriumi
AIP ADVANCES, 9(9), Sep, 2019
- Delta-temperatural electronic transportation achieved in metastable perovskite rare-earth nickelate thin films
- Chen Jikun, Hu Haiyang, Yajima Takeaki, Wang Jiaou, Ge Binghui, Dong Hongliang, Jiang Yong, Chen Nuofu
JOURNAL OF MATERIALS CHEMISTRY C, 7(26) 8101-8108, Jul 14, 2019
- Overcoming synthetic metastabilities and revealing metal-to-insulator transition & thermistor bi-functionalities for d-band correlation perovskite nickelates
- Chen Jikun, Hu Haiyang, Wang Jiaou, Yajima Takeaki, Ge Binghui, Ke Xinyou, Dong Hongliang, Jiang Yong, Chen Nuofu
MATERIALS HORIZONS, 6(4) 788-795, Apr, 2019
-
2019 Kawakami Lab.
- Now that Moore’s Law has reached its limits, where is device research headed? –From a computer architecture perspective–
- Masamitsu Tanaka,Koji Inoue,and Satoshi Kawakami
IEICE,Vol.102,No.10,pp.957-962,Oct. 2019,Commentary
- Novel frontier of photonics for data processing – Photonic accelerator –
- Kenichi Kitayama, Masaya Notomi, Makoto Naruse, Koji Inoue, Satoshi Kawakami, and Atsushi Uchida
APL Photonics, Vol.4, No.9, pp.090901, Sep. 2019
- Integrated Evaluation Environment for Nanophotonic Neural Network Accelerators
- Satoshi Kawakami,Takatugu Ono,Koji Inoue,Masaya Notomi, Makoto Naruse
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences,Vol.J102-A, No.6, pp.182-193, Jun. 2019
-
2018 Yajima Lab.
- Inhomogeneous barrier heights at dipole-controlled SrRuO3/Nb:SrTiO3 Schottky junctions
- T. Yajima, M. Minohara, C. Bell, H. Y. Hwang, Y. Hikita
Applied Physics Letters, 11 221603, Nov 26, 2018
- Hydrogenation of the wide-gap oxide semiconductor as a room-temperature and 3D-compatible electron doping technique.
- T. Yajima, G. Oike, S. Yamaguchi, S. Miyoshi, T. Nishimura, A. Toriumi
AIP Advances, 8 115133, Sep, 2018
- Analog Spike Processing with High Scalability and Low Energy Consumption Using Thermal Degree of Freedom in Phase Transition Materials.
- T. Yajima, T. Nishimura, and A, Toriumi
VLSI (Technology), 18 27-28, Jul, 2018
- Evolution of ferroelectric HfO2 in ultrathin region down to 3 nm
- Xuan Tian, Shigehisa Shibayama, Tomonori Nishimura, Takeaki Yajima, Shinji Migita, Akira Toriumi
Applied Physics Letters, 112(10), Mar 5, 2018
- Rigidity enhancement of GeO2by Y doping for reliable Ge gate stacks
- Tomonori Nishimura, Xiaoyu Tang, Takeaki Yajima, Akira Toriumi
Electron Devices Technology and Manufacturing Conference (EDTM), Mar, 2018
- Potential Influence of Surface Atomic Disorder on Fermi-level Pinning at Metal/SiGe Interface
- X Luo, T Nishimura, T Yajima, A Toriumi
Electron Devices Technology and Manufacturing (EDTM), Mar, 2018
- Anomalous Spectral Shape Evolution of Ge Raman Shift in Oxidation of SiGe.
- Y Noma, W Song, T Nishimura, T Yajima, A Toriumi
IEEE Electron Devices Technology and Manufacturing (EDTM), Mar, 2018
- Strain Tuning in Complex Oxide Epitaxial Films Using an Ultrathin Strontium Aluminate Buffer Layer
- Di Lu, Yasuyuki Hikita, David J. Baek, Tyler A. Merz, Hiroki Sato, Bongju Kim, Takeaki Yajima, Christopher Bell, Arturas Vailionis, Lena F. Kourkoutis, Harold Y. Hwang
Physica Status Solidi – Rapid Research Letters, 12(3), Mar 1, 2018
- Rigidity Enhancement of GeO2 by Y-Doping for Reliable Ge Gate Stacks
- Nishimura Tomonori, Tang Xiaoyu, Lu Cimang, Yajima Takeaki, Toriumi Akira
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY, 6(1) 1207-1212, Mar, 2018
- Sub-nm EOT ferroelectric HfO2 on p+Ge with highly reliable field cycling properties
- X. Tian, L. Xu, S. Shibayama, T. Nishimura, T. Yajima, S. Migita, A. Toriumi
Technical Digest – International Electron Devices Meeting, IEDM, 17 37.1.1-37.1.4, Jan 23, 2018
-
2018 Kawakami Lab.
- Framework for Performance Analysis of Nano-Photonic Neural Accelerator
- Satoshi Kawakami, Takatsugu Ono, Koji Inoue, and Masaya Notomi
In Proceedings of the 31st Workshop on Circuits and Systems (in Japanese), KWS31, pp.42–47, May 2018
- Parallel Precomputation with Input Value Prediction for Model Predictive Control Systems
- Satoshi Kawakami, Takatsugu Ono, Toshiyuki Ohtsuka, and Koji Inoue
IEICE Transactions on Information and Systems, vol. E101-D, No. 12, pp. 2864-2877, December 2018
-
2017 Yajima Lab.
- Dipole-correlated carrier transportation and orbital reconfiguration in strain-distorted SrNbxTi1-xO3/KTaO3
- Jikun Chen, Xinyou Ke, Jiaou Wang, Takeaki Yajima, Haijie Qian, Song Sun
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 19(44) 29913-29917, Nov, 2017
- Kinetic pathway of the ferroelectric phase formation in doped HfO2 films
- Lun Xu, Tomonori Nishimura, Shigehisa Shibayama, Takeaki Yajima, Shinji Migita, Akira Toriumi
JOURNAL OF APPLIED PHYSICS, 122(12), Sep, 2017
- Thermal oxidation kinetics of germanium
- X. Wang, T. Nishimura, T. Yajima, A. Toriumi
APPLIED PHYSICS LETTERS, 111(5) 052101, Jul, 2017
- n(+)Si/pGe Heterojunctions Fabricated by Low Temperature Ribbon Bonding With Passivating Interlayer
- Tony Chi Liu, Shoichi Kabuyanagi, Tomonori Nishimura, Takeaki Yajima, Akira Toriumi
IEEE ELECTRON DEVICE LETTERS, 38(6) 716-719, Jun, 2017
- Thermodynamic understanding and analytical modeling of interfacial SiO2 scavenging in HfO2 gate stacks on Si, SiGe, and SiC
- Xiuyan Li, Takeaki Yajima, Tomonori Nishimura, Akira Toriumi
APPLIED PHYSICS LETTERS, 110(14), Apr, 2017
- Ultrahigh Thermoelectric Performance in SrNb0.2Ti0.8O3 Oxide Films at a Submicrometer-Scale Thickness
- Jikun Chen, Hongyi Chen, Feng Hao, Xinyou Ke, Nuofu Chen, Takeaki Yajima, Yong Jiang, Xun Shi, Kexiong Zhou, Max Dobeli, Tiansong Zhang, Binghui Ge, Hongliang Dong, Huarong Zeng, Wenwang Wu, Lidong Chen
ACS ENERGY LETTERS, 2(4) 915-921, Apr, 2017
- Identifying the Collective Length in VO2 Metal-Insulator Transitions
- Takeaki Yajima, Tomonori Nishimura, Akira Toriumi
SMALL, 13(12), Mar, 2017
- General relationship for cation and anion doping effects on ferroelectric HfO2 formation
- L. Xu, S. Shibayama, K. Izukashi, T. Nishimura, T. Yajima, S. Migita, A. Toriumi
Technical Digest – International Electron Devices Meeting, IEDM, 25.2.1-25.2.4, Jan 31, 2017
- Functional passive material VO2 for analogue signal processing with high-speed, low power, and robust performance
- T. Yajima, T. Nishimura, A. Toriumi
Technical Digest – International Electron Devices Meeting, IEDM 34.4.1 – 34.4.4 Jan 31, 2017
- Local, Isotropic, and Damageless Doping to Oxide Semiconductors by Using Electrochemistry
- Takeaki Yajima, Tomonori Nishimura, Akira Toriumi
2017 IEEE ELECTRON DEVICES TECHNOLOGY AND MANUFACTURING CONFERENCE (EDTM), 80-81, 2017
- Reconsideration of Metal Work Function at Metal/Semiconductor Interface
- Nishimura Tomonori, Yajima Takeaki, Toriumi Akira
SEMICONDUCTOR PROCESS INTEGRATION 10, 80(4) 107-112, 2017
-
2016 Yajima Lab.
- Ferroelectric phase stabilization of HfO2 by nitrogen doping
- Lun Xu, Tomonori Nishimura, Shigehisa Shibayama, Takeaki Yajima, Shinji Migita, Akira Toriumi
APPLIED PHYSICS EXPRESS, 9(9), Sep, 2016
- Ferroelectricity of nondoped thin HfO2 films in TiN/HfO2/TiN stacks
- Tomonori Nishimura, Lun Xu, Shigehisa Shibayama, Takeaki Yajima, Shinji Migita, Akira Toriumi
JAPANESE JOURNAL OF APPLIED PHYSICS, 55(8), Aug, 2016
- Anomalous electrical properties of Au/SrTiO3 interface
- Lun Xu, Takeaki Yajima, Tomonori Nishimura, Akira Toriumi
JAPANESE JOURNAL OF APPLIED PHYSICS, 55(8), Aug, 2016
- Reexamination of Fermi level pinning for controlling Schottky barrier height at metal/Ge interface
- Tomonori Nishimura, Takeaki Yajima, Akira Toriumi
APPLIED PHYSICS EXPRESS, 9(8), Aug, 2016
- Independent control of phases and defects in TiO2 thin films for functional transistor channels
- Takeaki Yajima, Go Oike, Tomonori Nishimura, Akira Toriumi
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 213(8) 2196-2202, Aug, 2016
- General relationship for cation and anion doping effects on ferroelectric HfO2 formation
- L. Xu, S. Shibayama, K. Izukashi, T. Nishimura, T. Yajima, S. Migita, A. Toriumi
2016 IEEE INTERNATIONAL ELECTRON DEVICES MEETING (IEDM), 16 608-611, 2016
- Functional Passive Material VO2 for Analogue Signal Processing with High-Speed, Low Power, and Robust Performance
- T. Yajima, T. Nishimura, A. Toriumi
2016 IEEE INTERNATIONAL ELECTRON DEVICES MEETING (IEDM), 16 858-861, 2016
- Experimental evidence of zone-center optical phonon softening by accumulating holes in thin Ge
- Shoichi Kabuyanagi, Tomonori Nishimura, Takeaki Yajima, Akira Toriumi
AIP ADVANCES, 6(1), Jan, 2016
-
2015 Yajima Lab.
- Positive-bias gate-controlled metal-insulator transition in ultrathin VO2 channels with TiO2 gate dielectrics
- Takeaki Yajima, Tomonori Nishimura, Akira Toriumi
NATURE COMMUNICATIONS, 6, Dec, 2015
- Study of Si kinetics in interfacial SiO2 scavenging in HfO2 gate stacks
- Xiuyan Li, Takeaki Yajima, Tomonori Nishimura, Akira Toriumi
APPLIED PHYSICS EXPRESS, 8(6), Jun, 2015
- Nondestructive characterization of oxide/germanium interface by direct-gap photoluminescence analysis
- Shoichi Kabuyanagi, Tomonori Nishiumura, Takeaki Yajima, Akira Toriumi
APPLIED PHYSICS EXPRESS, 8(5), May, 2015
- Drastic change in electronic domain structures via strong elastic coupling in VO2 films
- Takeaki Yajima, Yuma Ninomiya, Tomonori Nishimura, Akira Toriumi
PHYSICAL REVIEW B, 91(20), May, 2015
- Analytical Formulation of SiO<inf>2</inf>-IL scavenging in HfO<inf>2</inf>/SiO<inf>2</inf>/Si gate stacks – A key is the SiO<inf>2</inf>/Si interface reaction
- Xiuyan Li, Takeaki Yajima, Tomonori Nishimura, Kosuke Nagashio, Akira Toriumi
Technical Digest – International Electron Devices Meeting, IEDM, 2015-(February) 21.2.1-21.2.4, Feb 20, 2015
- Enhanced Electrical Transparency by Ultrathin LaAlO3 Insertion at Oxide Metal/Semiconductor Heterointerfaces
- Yajima, Takeaki, Minohara, Makoto, Bell, Christopher, Kumigashira, Hiroshi, Oshima, Masaharu, Hwang, Harold Y., Hikita, Yasuyuki
Nano Letters, 15(3) 1622-1626, 2015
- Controlling band alignments by artificial interface dipoles at perovskite heterointerfaces
- Yajima, Takeaki, Hikita, Yasuyuki, Minohara, Makoto, Bell, Christopher, Mundy, Julia A., Kourkoutis, Lena F., Muller, David A., Kumigashira, Hiroshi, Oshima, Masaharu, Hwang, Harold Y.
Nature Communications, 6, 2015
- Significance of Kinetic-linkage of Oxygen Vacancy with SiO2/Si Interface for SiO2-IL Scavenging in HfO2 Gate Stacks
- Xiuyan Li, Takeaki Yajima, Tomonori Nishimura, Akira Toriumi
2015 SILICON NANOELECTRONICS WORKSHOP (SNW), 2015
- Effect of Free Carrier Accumulation or Depletion on Zone-center Vibrational Mode in Ge
- Shoichi Kabuyanagi, Tomonori Nishimura, Takeaki Yajima, Akira Toriumi
2015 SILICON NANOELECTRONICS WORKSHOP (SNW), 2015
- Recent Progress of Junction Technology for Germanium CMOS
- Tomonori Nishimura, Choong Hyun Lee, Toshimitsu Nakamura, Takeaki Yajima, Kosuke Nagashio, Koji Kita, Akira Toriumi
2015 15TH INTERNATIONAL WORKSHOP ON JUNCTION TECHNOLOGY (IWJT), 65-68, 2015
- Gate-bias dependent phonon softening observed in Ge MOSFETs
- Shoichi Kabuyanagi, Tomonori Nishimura, Takeaki Yajima, Akira Toriumi
ECS Transactions, 69(10) 75-80, 2015
-
2014 Yajima Lab.
- Effect of Si substrate on interfacial SiO2 scavenging in HfO2/SiO2/Si stacks
- Xiuyan Li, Takeaki Yajima, Tomonori Nishimura, Kosuke Nagashio, Akira Toriumi
APPLIED PHYSICS LETTERS, 105(18), Nov, 2014
- Atomically flat planarization of Ge(100), (110), and (111) surfaces in H-2 annealing
- Tomonori Nishimura, Shoichi Kabuyanagi, Wenfeng Zhang, Choong Hyun Lee, Takeaki Yajima, Kosuke Nagashio, Akira Toriumi
APPLIED PHYSICS EXPRESS, 7(5), May, 2014
- HfO2-assisted SiO2 reduction in HfO2/SiO2/Si stacks
- Xiuyan Li, Takeaki Yajima, Tomonori Nishimura, Kosuke Nagashio, Akira Toriumi
THIN SOLID FILMS, 557 272-275, Apr, 2014
- Visualizing the interfacial evolution from charge compensation to metallic screening across the manganite metal-insulator transition
- Julia A. Mundy, Yasuyuki Hikita, Takeaki Hidaka, Takeaki Yajima, Takuya Higuchi, Harold Y. Hwang, David A. Muller, Lena F. Kourkoutis
NATURE COMMUNICATIONS, 5, Mar, 2014
- Atomic-scale Planarization of Ge (111), (110) and (100) Surfaces
- Tomonori Nishimura, ChoongHyun Lee, Takeaki Yajima, Kosuke Nagashio, Akira Toriumi
2014 7TH INTERNATIONAL SILICON-GERMANIUM TECHNOLOGY AND DEVICE MEETING (ISTDM), 127-128, 2014
- Analytical Formulation of SiO2-IL scavenging in HfO2/SiO2/Si gate stacks – A key is the SiO2/Si interface reaction –
- Xiuyan Li, Takeaki Yajima, Tomonori Nishimura, Kosuke Nagashio, Akira Toriumi
2014 IEEE INTERNATIONAL ELECTRON DEVICES MEETING (IEDM), 2014
- Kinetic Model for Scavenging of SiO2 Interface Layer in HfO2 Gate Stacks
- Xiuyan Li, Takeaki Yajima, Tomonori Nishimura, Kosuke Nagashio, Akira Toriumi
2014 IEEE SILICON NANOELECTRONICS WORKSHOP (SNW), 2014
-
2013 Yajima Lab.
- Coexistence of two-dimensional and three-dimensional Shubnikov–de Haas oscillations in Ar+-irradiated KTaO3
- S. Harashima, C. Bell, M. Kim, T. Yajima, Y. Hikita, H. Y. Hwang
Physical Review B – Condensed Matter and Materials Physics, 88(8) 085102, Aug 2, 2013
- Hot electron transport in a strongly correlated transition-metal oxide
- Kumari Gaurav Rana, Takeaki Yajima, Subir Parui, Alexander F. Kemper, Thomas P. Devereaux, Yasuyuki Hikita, Harold Y. Hwang, Tamalika Banerjee
SCIENTIFIC REPORTS, 3, Feb, 2013
- Atomically Flat Germanium (111) Surface by Hydrogen Annealing
- T. Nishimura, S. Kabuyanagi, C. H. Lee, T. Yajima, K. Nagashio, A. Toriumi
ULSI PROCESS INTEGRATION 8, 58(9) 201-206, 2013
- High electron mobility (>16 cm2/Vsec) FETs with high on/off ratio (>106) and highly conductive films (σ>102 S/cm) by chemical doping in very thin (∼20 nm) TiO2 films on thermally grown SiO2
- Go Oike, Takeaki Yajima, Tomonori Nishimura, Kosuke Nagashio, Akira Toriumi
Technical Digest – International Electron Devices Meeting, IEDM, 11.5.4, 2013
-
2013 Kawakami Lab.
- Speculative Execution for Real-time Model Predictive Control on Manicure Processor (in Japanese)
- Satoshi Kawakami, Akihito Iwanaga, and Koji Inoue
In Proceedings of the 2013 Symposium on Advanced Computing Systems and Infrastructures (SACSIS), pp78-82, May 2013
- Many-core Acceleration for Model Predictive Control Systems
- Satoshi Kawakami, Akihito Iwanaga, and Koji Inoue
In Proceedings of the ACM International Workshop on Manycore Embedded Systems in conjunction with the International Symposium on Computer Architecture (ISCA), pp.17 – 24, June 2013
-
2011 Yajima Lab.
- Reentrant insulating state in ultrathin manganite films
- Bongju Kim, Daeyoung Kwon, Takeaki Yajima, Christopher Bell, Yasuyuki Hikita, Bog G. Kim, Harold Y. Hwang
APPLIED PHYSICS LETTERS, 99(9), Aug, 2011
- A heteroepitaxial perovskite metal-base transistor
- Takeaki Yajima, Yasuyuki Hikita, Harold Y. Hwang
NATURE MATERIALS, 10(3) 198-201, Mar, 2011
-
2010 Yajima Lab.
- Charge Writing at the LaAlO3/SrTiO3 Surface
- Yanwu Xie, Christopher Bell, Takeaki Yajima, Yasuyuki Hikita, Harold Y. Hwang
NANO LETTERS, 10(7) 2588-2591, Jul, 2010
-
2009 Yajima Lab.
- Mn3O4 precipitates in laser-ablated manganite films
- T. Higuchi, T. Yajima, L. Fitting Kourkoutis, Y. Hikita, N. Nakagawa, D. A. Muller, H. Y. Hwang
APPLIED PHYSICS LETTERS, 95(4) 043112, Jul, 2009
- Termination control of the interface dipole in La0.7Sr0.3MnO3/Nb:SrTiO3 (001) Schottky junctions
- Yasuyuki Hikita, Mitsuru Nishikawa, Takeaki Yajima, Harold Y. Hwang
PHYSICAL REVIEW B, 79(7), Feb, 2009