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International Symposium on Physical & Failure Analysis of Integrated Circuits

作者： Erh-Jye Wei Bing-Yue Tsui Pin-Jiun Wu Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu Taiwan R.O.C. Department of Electronics Engineering and Institute of Electronics National Chiao Tung University Hsinchu Taiwan R.O.C. National Synchrotron Radiation Research Center (NSRRC) Hsinchu Taiwan R.O.C.

ISBN: (纸本)9781467382601

Germanium metal-insulator-semiconductor (MIS) structure with HfO 2 /Al 2 O 3 /GeO 2 gate stack have been demonstrated to exhibit good performance. In this work, the effect of formation temperature of the gate stack on the quality of the gate dielectric is investigated. It is found that the higher plasma oxidation temperature helps the GeO 2 formation and less interface states. But the higher deposition temperature of the ALD high-k films may degrade the interface and result in higher leakage current.

关键词： Failure analysis Integrated circuits Decision support systems

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A robust bendable IrO_x thin film via mild alkaline solution process for neuron stimulating electrodes

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Surfaces and Interfaces 2024年 44卷

作者： Tso, Kuang-Chih Chan, Tzu-Ying Yu, Tsung-Chun Tao, Yu-Jen Chu, Chao-Yi Chen, San-Yuan Lee, Jyh-Fu Ohta, Jun Chen, Po-Chun Wu, Pu-Wei Graduate Program of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Division of Materials Science Graduate School of Science and Technology Nara Institute of Science Technology Nara Ikoma Takayama 8916-5 Japan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei 106 Taiwan National Synchrotron Radiation Research Center Hsinchu 300 Taiwan

We demonstrate a unique chemical formula to deposit hydrous iridium oxide thin film on a platinum-coated polyimide substrate. In a mild alkaline solution, the iridium (III) precursor undergoes the ligand exchange and hydrolysis reaction to become the iridium (III) dimers that are physically adsorbed on the substrate for subsequent heterogeneous condensation and growth of amorphous hydrous iridium oxide thin film. Both UV–Vis and X-ray absorption spectroscopy (XAS) are employed to determine the reaction steps involved. The chemical nature and crystallinity of the hydrous iridium oxide thin film are investigated by XAS, X-ray photon spectroscopy, and X-ray diffraction. The hydrous iridium oxide thin film reveals an impressive normalized charge storage capacity (CSC) of 0.3 mC/cm²-nm and a low impedance (80.5 Ω) at 1k Hz. In addition, in bending test of 3,000 cycles, the hydrous iridium oxide thin film retains 91.2 % of its initial normalized CSC without any physical crack and delamination. The cell viability test suggests negligible bio-toxicity. Our results provide a solid evidence of fabricating a robust flexible electrode for neural interfaces for potential use in implantable electronic devices. © 2023 Elsevier B.V.

关键词： Bio-electrode Flexible substrate Implantable electronic devices Iridium dimers Iridium oxide Polyimide

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Generation and application of femtosecond X-rays from a synchrotron

Generation and application of femtosecond X-rays from a sync...

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IEEE Photonics Conference (IPC)

作者： R.W. Schoenlein H.H.W. Chong T.E. Glover P.A. Heimann C.V. Shank A.A. Zholents M.S. Zolotorev Materials Sciences Division Ernest Orlando Lawrence Berkeley National Laboratory Berkeley CA USA Applied Science and Technology Graduate Group University of California Berkeley Berkeley CA Advanced Light Source Division Lawrence Berkeley National Laboratory USA Accelerator and Fusion Research Division Lawrence Berkeley National Laboratory

We demonstrate a novel scheme for generating ultrashort pulses of synchrotron radiation. Our approach is to create femtosecond time-structure on a long electron bunch by using a femtosecond laser pulse to modulate the energy of an ultrashort slice of the bunch Femtosecond synchrotron pulses are directly measured from a bend-magnet beamline at the Advanced light source (ALS). The measured pulse duration is determined by the storage ring dispersion integrated from the wiggler to the radiation bend-magnet. A new beamline, dedicated to ultrafast X-ray spectroscopy is currently under construction at the ALS and will provide X-ray pulses of <100 fs duration. The femtosecond time structure is invariant over the entire spectral range of bend-magnet emission from the near infrared to the X-ray regime, making this a powerful tool for femtosecond X-ray spectroscopy.

关键词： Pulse measurements Pulse modulation Optical pulses Spectroscopy Optical pulse generation Synchrotron radiation Electron beams Ring lasers X-ray lasers Optical modulation

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A weak topological insulator state in quasi-one-dimensional superconductor TaSe3

arXiv

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arXiv 2020年

作者： Hyun, Jounghoon Jeong, Min Yong Kim, Sunghun Jung, Myung-Chul Lee, Yeonghoon Lim, Chan-Young Cha, Jaehun Lee, Gyubin An, Yeojin Hashimoto, Makoto Lu, Donghui Denlinger, Jonathan D. Han, Myung Joon Kim, Yeongkwan Department of Physics Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Stanford Synchrotron Radiation Lightsource Stanford Linear Accelerator Center Menlo ParkCA94025 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Graduate School of Nanoscience and Technology Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of

A well-established way to find novel Majorana particles in a solid-state system is to have superconductivity arising from the topological electronic structure. To this end, the heterostructure systems that consist of normal superconductor and topological material have been actively explored in the past decade. However, a search for the single material system that simultaneously exhibits intrinsic superconductivity and topological phase has been largely limited, although such a system is far more favorable especially for the quantum device applications. Here, we report the electronic structure study of a quasi-one-dimensional (q1D) superconductor TaSe3. Our results of angle-resolved photoemission spectroscopy (ARPES) and first-principles calculation clearly show that TaSe3 is a topological superconductor. The characteristic bulk inversion gap, in-gap state and its shape of non-Dirac dispersion concurrently point to the topologically nontrivial nature of this material. The further investigations of the Z2 indices and the topologically distinctive surface band crossings disclose that it belongs to the weak topological insulator (WTI) class. Hereby, TaSe3 becomes the first verified example of an intrinsic 1D topological superconductor. It hopefully provides a promising platform for future applications utilizing Majorana bound states localized at the end of 1D intrinsic topological superconductors. Copyright © 2020, The Authors. All rights reserved.

关键词： Selenium compounds

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Kramers nodal lines in intercalated TaS2 superconductors

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Nature Communications 2025年第1期16卷 1-10页

作者： Yichen Zhang Yuxiang Gao Jianwei Huang Yucheng Guo Ziqin Yue Ji Seop Oh Junichiro Kono Emilia Morosan Ming Yi Aki Pulkkinen Alberto Marmodoro Ján Minár Xingyao Guo Xue-Jian Gao Kam Tuen Law Robert J. Birgeneau Alex Moon Luis Balicas Mohamed Oudah Alannah M. Hallas Alexei Fedorov Sung-Kwan Mo Makoto Hashimoto Donghui Lu Anil Rajapitamahuni Elio Vescovo Pavan Hosur Department of Physics and Astronomy Rice University Houston TX 77005 USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX 77005 USA Department of Physics University of California Berkeley Berkeley CA 94720 USA Rice Center for Quantum Materials Rice University Houston TX 77005 USA Department of Electrical and Computer Engineering Rice University Houston TX 77005 USA Department of Materials Science and NanoEngineering Rice University Houston TX 77005 USA Smalley-Curl Institute Rice University Houston TX 77005 USA New Technologies Research Center University of West Bohemia Plzen 301 00 Czech Republic Department of Physics Hong Kong University of Science and Technology Clear Water Bay Hong Kong China Materials Science Division Lawrence Berkeley National Laboratory Berkeley Berkeley CA 94720 USA National High Magnetic Field Laboratory Tallahassee Tallahassee FL 32310 USA Physics Department Florida State University Tallahassee FL 32306 USA Stewart Blusson Quantum Matter Institute University of British Columbia Vancouver Vancouver BC V6T 1Z4 Canada Department of Physics & Astronomy University of British Columbia Vancouver Vancouver BC V6T 1Z1 Canada Canadian Institute for Advanced Research Toronto Toronto ON M5G 1M1 Canada Advanced Light Source Lawrence Berkeley National Laboratory Berkeley Berkeley CA 94720 USA Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park CA 94025 USA National Synchrotron Light Source II Brookhaven National Lab Upton NY 11973 USA Department of Physics and Texas Center for Superconductivity University of Houston Houston TX 77204 USA

Kramers degeneracy is one fundamental embodiment of the quantum mechanical nature of particles with half-integer spin under time reversal symmetry. Under the chiral and noncentrosymmetric achiral crystalline symmetries, Kramers degeneracy emerges respectively as topological quasiparticles of Weyl fermions and Kramers nodal lines (KNLs), anchoring the Berry phase-related physics of electrons. However, an experimental demonstration for ideal KNLs well isolated at the Fermi level is lacking. Here, we establish a class of noncentrosymmetric achiral intercalated transition metal dichalcogenide superconductors with large Ising-type spin-orbit coupling, represented by InxTaS2, to host an ideal KNL phase. We provide evidence from angle-resolved photoemission spectroscopy with spin resolution, angle-dependent quantum oscillation measurements, and ab-initio calculations. Our work not only provides a realistic platform for realizing and tuning KNLs in layered materials, but also paves the way for exploring the interplay between KNLs and superconductivity, as well as applications pertaining to spintronics, valleytronics, and nonlinear transport.

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XAS Study of Core-Shell PtRu Nanoparticles from Galvanic Pulse Current Deposition

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ECS Meeting Abstracts 2012年第45期MA2012-02卷

作者： Yu-Chi Hsieh Li-Chung Chang Pu-Wei Wu Jyh-Fu Lee National Chiao Tung University Graduate Program for Science and Technology of Accelerator Light Source Department of Materials Science and Engineering National Chiao Tung University National Synchrotron Radiation Research Center

Abstract not Available.

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Unusual Layer-Dependent Charge Distribution, Collective Mode Coupling, and Superconductivity in Multilayer Cuprate Ba2Ca3Cu4O8F2

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Physical Review Letters 2009年第3期103卷 036403-036403页

作者： Yulin Chen Akira Iyo Wanli Yang Akihiro Ino M. Arita Steve Johnston Hiroshi Eisaki H. Namatame M. Taniguchi Thomas P. Devereaux Zahid Hussain Z.-X. Shen SIMES SLAC National Accelerator Laboratory Menlo Park California 94025 USA Geballe Laboratory for Advanced Materials Departments of Physics and Applied Physics Stanford University Stanford California 94305 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA National Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki 305-8568 Japan Graduate School of Science Hiroshima University Higashi-Hiroshima 739-8526 Japan Hiroshima Synchrotron Radiation Center Hiroshima University Higashi-Hiroshima 739-0046 Japan

Low energy ultrahigh momentum resolution angle resolved photoemission spectroscopy study on four-layer self-doped high Tc superconductor Ba2Ca3Cu4O8F2 (F0234) revealed fine structure in the band dispersion, identifying the unconventional association of hole and electron doping with the inner and outer CuO2 layers, respectively. For the states originating from two inequivalent CuO2 layers, different energy scales are observed in dispersion kinks associated with the collective mode coupling, with the larger energy scale found in the electron (n-) doped state which also has stronger coupling strength. Given the earlier finding that the superconducting gap is substantially larger along the n-type Fermi surface, our observations connect the mode coupling energy and strength with magnitude of the pairing gap.

关键词： Fluorine compounds

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Fabrication of Graphene by Electrochemical Exfoliation in Alkaline Electrolytes

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ECS Transactions 2013年第24期58卷

作者： Li-Chung Chang Yu-Chi Hsieh Yong-Min Chen Pu-Wei Wu Jyh-Fu Lee Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University Department of Materials Science and Engineering National Chiao Tung University National Synchrotron Radiation Research Center

Fabrication of graphene was demonstrated by electrochemical exfoliation of graphite in an ammonium hydroxide solution. The processing parameter of applied voltage was optimized to accomplish graphene productivity and desired chemical composition. Images from the atomic force microscopy showed graphene sheets with lateral sizes of several hundred nanometers. Images from the transmission electron microscopy indicated the existence of stacked graphene sheets with thickness of a few graphene layers. Raman spectroscopy confirmed variation of as-synthesized graphene and bulk graphite. X-ray photoemission spectroscopy suggested the formation of graphene oxide at large voltage.

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Surface Modification of PtRu/C by Mono-layered Decoration of Pt, Au, Pd, and Ir for Oxygen Reduction Reaction

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ECS Meeting Abstracts 2012年第54期MA2012-02卷

作者： Che-Wei Kuo Li-Chung Chang Yu-Chi Hsieh Pu-Wei Wu Jyh-Fu Lee National Chiao Tung University Graduate Program for Science and Technology of Accelerator Light Source Department of Materials Science and Engineering National Chiao Tung University National Synchrotron Radiation Research Center

Abstract not Available.

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Characterization of magnetic properties of Sr2CuWO6 and Sr2CuMoO6

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Physical Review B 2014年第13期89卷 134419-134419页

作者： Sami Vasala Hassan Saadaoui Elvezio Morenzoni Omar Chmaissem Ting-Shan Chan Jin-Ming Chen Ying-Ya Hsu Hisao Yamauchi Maarit Karppinen Department of Chemistry Aalto University FI-00076 AALTO Finland Laboratory for Muon Spin Spectroscopy Paul Scherrer Institute CH-5232 Villigen PSI Switzerland Department of Physics Northern Illinois University DeKalb Illinois 60115 USA Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu 30076 Taiwan

In this work we examine the low-temperature magnetic properties of the two double-perovskite compounds Sr2CuWO6 and Sr2CuMoO6 using magnetic susceptibility, muon spin rotation and relaxation, and neutron powder diffraction measurements. Additionally, the most relevant spin exchange interaction constants are derived from ab initio electronic structure calculations, aided by x-ray absorption spectroscopy. The compounds exhibit quasi-two-dimensional magnetic properties, with broad maxima at Tmax = 83 and 95 K for Sr2CuWO6 and Sr2CuMoO6, respectively. However, three-dimensional long-range order takes place below TN = 24(1) and 28(2) K for Sr2CuWO6 and Sr2CuMoO6, respectively. Our results show that the low-dimensional magnetic correlations are mainly due to the significant next-nearest-neighbor interactions in the ab plane of the double-perovskite structure, whereas three-dimensional long-range magnetic order is caused by weaker next-nearest-neighbor interactions along the c axis. Next-nearest-neighbor interactions are also slightly frustrated by weaker nearest-neighbor interactions within the ab plane. Based on these results we predict the low-temperature magnetic structure in these compounds to be type-II antiferromagnetic order of the double-perovskite lattice.

关键词： MAGNETIC properties LOW temperatures OXIDE minerals PEROVSKITE MAGNETIC susceptibility

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