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Observation of roton-like dispersion relations in acoustic metamaterials

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arXiv 2021年

作者： Zhu, Zhenxiao Gao, Zhen Liu, Gui-Geng Ge, Yong Wang, Yin Xi, Xiang Yan, Bei Chen, Fujia Shum, Perry Ping Sun, Hongxiang Yang, Yihao Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore School of Physics and Electronic Engineering Jiangsu University Zhenjiang212013 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center Zhejiang University Hangzhou310027 China

Roton dispersion relations, displaying a pronounced "roton" minimum at finite momentum, were firstly predicted by Landau and have been extensively explored in correlated quantum systems at low temperatures. Recently, the roton-like dispersion relations were theoretically extended to classical acoustics, which, however, have remained elusive in reality. Here, we report the experimental observation of roton-like dispersions in acoustic metamaterials with beyond-nearest-neighbour interactions at ambient temperatures. The resulting metamaterial supports multiple coexisting modes with different wavevectors and group velocities at the same frequency and broadband backward waves, analogous to the "return flow" termed by Feynman in the context of rotons. Moreover, by increasing the order of long-range interaction, we observe multiple rotons on a single dispersion band, which have never appeared in Landau's prediction or any other condensed matter study. The realization of roton-like dispersions in metamaterials could pave the way to explore novel physics and applications on quantum-inspired phenomena in classical systems. © 2021, CC BY.

关键词： Quantum optics

Electrochemical control of ferroelectricity in hafnia-based ferroelectric devices using reversible oxygen migration

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arXiv 2021年

作者： Shao, Minghao Liu, Houfang He, Ri Li, Xiaomei Wu, Liang Ma, Ji Hu, Xiangchen Zhao, Ruiting Zhong, Zhicheng Yu, Yi Wan, Caihua Yang, Yi Nan, Ce-Wen Bai, Xuedong Ren, Tian-Ling Wang, X. Renshaw Tsinghua University Beijing100084 China Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming650093 China School of Physical Science and Technology ShanghaiTech University Shanghai201210 China School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Beijing100084 China School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Ave Singapore639798 Singapore

Ferroelectricity, especially in hafnia-based thin films at nanosizes, has been rejuvenated in the fields of low-power, nonvolatile and Si-compatible modern memory and logic applications. Despite tremendous efforts to explore the formation of the metastable ferroelectric phase and the polarization degradation during field cycling, the ability of oxygen vacancy to exactly engineer and switch polarization remains to be elucidated. Here we report reversibly electrochemical control of ferroelectricity in Hf0.5Zr0.5O2 (HZO) heterostructures with a mixed ionic-electronic LaSrMnO3 electrode, achieving a hard breakdown field more than 18 MV/cm, over fourfold as high as that of typical HZO. The electrical extraction and insertion of oxygen into HZO is macroscopically characterized and atomically imaged in situ. Utilizing this reversible process, we achieved multiple polarization states and even repeatedly repaired the damaged ferroelectricity by reversed negative electric fields. Our study demonstrates the robust and switchable ferroelectricity in hafnia oxide distinctly associated with oxygen vacancy and opens up opportunities to recover, manipulate, and utilize rich ferroelectric functionalities for advanced ferroelectric functionality to empower the existing Si-based electronics such as multi-bit storage. Copyright © 2021, The Authors. All rights reserved.

关键词： Oxygen vacancies

Two-qubit sweet spots for capacitively coupled exchange-only spin qubits

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arXiv 2021年

作者： Feng, MengKe Zaw, Lin Htoo Koh, Teck Seng Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore School of Electrical Engineering and TeleComm. University of New South Wales SydneyNSW2052 Australia Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 117543 Singapore

The implementation of high fidelity two-qubit gates is a bottleneck in the progress towards universal quantum computation in semiconductor quantum dot qubits. We study capacitive coupling between two triple quantum dot spin qubits encoded in the S = 1/2, Sz = −1/2 decoherence-free subspace - the exchange-only (EO) spin qubits. We report exact gate sequences for CPHASE and CNOT gates, and demonstrate theoretically, the existence of multiple two-qubit sweet spots (2QSS) in the parameter space of capacitively coupled EO qubits. Gate operations have the advantage of being all-electrical, but charge noise that couple to electrical parameters of the qubits cause decoherence. Assuming noise with a 1/f spectrum, two-qubit gate fidelities and times are calculated, which provide useful information on the noise threshold necessary for fault-tolerance. We study two-qubit gates at single and multiple parameter 2QSS. In particular, for two existing EO implementations - the resonant exchange (RX) and the always-on exchange-only (AEON) qubits - we compare two-qubit gate fidelities and times at positions in parameter space where the 2QSS are simultaneously single-qubit sweet spots (1QSS) for the RX and AEON. These results provide a potential route to the realization of high fidelity quantum computation. © 2021, CC BY.

关键词： Semiconductor quantum dots

Publisher Correction: Deciphering DNA variant-associated aberrant splicing with the aid of RNA sequencing

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Nature genetics 2023年第7期55卷 1251页

作者： Bin Zhang Xin Gao Computer Science Program Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia. KAUST Computational Bioscience Research Center King Abdullah University of Science and Technology Thuwal Saudi Arabia. Computer Science Program Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia. xin.gao@kaust.edu.sa. KAUST Computational Bioscience Research Center King Abdullah University of Science and Technology Thuwal Saudi Arabia. xin.gao@kaust.edu.sa.

Lecture Notes in Electrical Engineering

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Preface

Lecture Notes in electrical engineering 2024年 1118卷 ix-x页

作者： Yadav, Sanjay Arya, Yogendra Muhamad, Nor Asiah Sebaa, Karim Physico-Mechanical Metrology Division CSIR-National Physical Laboratory Delhi New Delhi India J.C. Bose University of Science and Technology YMCA Haryana Faridabad India Electrical and Electronic Engineering Department Universiti Teknologi Brunei Bandar Seri Begawan Brunei University of Medea Médéa Algeria

Observation of current-induced switching in non-collinear antiferromagnetic IrMn3 by differential voltage measurements

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arXiv 2021年

作者： Arpaci, Sevdenur Lopez-Dominguez, Victor Shi, Jiacheng Sánchez-Tejerina, Luis Garesci, Francesca Wang, Chulin Yan, Xueting Sangwan, Vinod K. Grayson, Matthew Hersam, Mark C. Finocchio, Giovanni Amiri, Pedram Khalili Department of Electrical and Computer Engineering Northwestern University EvanstonIL60208 United States Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States Department of Mathematical and Computer Sciences Physical Sciences and Earth Sciences University of Messina Messina98166 Italy Department of Engineering University of Messina Messina98166 Italy Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Department of Chemistry Northwestern University EvanstonIL60208 United States

There is accelerating interest in developing memory devices using antiferromagnetic (AFM) materials, motivated by the possibility for electrically controlling AFM order via spin-orbit torques, and its read-out via magnetoresistive effects. Recent studies have shown, however, that high current densities create non-magnetic contributions to resistive switching signals in AFM/heavy metal (AFM/HM) bilayers, complicating their interpretation. Here we introduce an experimental protocol to unambiguously distinguish current-induced magnetic and nonmagnetic switching signals in AFM/HM structures, and demonstrate it in IrMn3/Pt devices. A six-terminal double-cross device is constructed, with an IrMn3 pillar placed on one cross. The differential voltage is measured between the two crosses with and without IrMn3 after each switching attempt. For a wide range of current densities, reversible switching is observed only when write currents pass through the cross with the IrMn3 pillar, eliminating any possibility of non-magnetic switching artifacts. Micromagnetic simulations support our findings, indicating a complex domain-mediated switching process. © 2021, CC BY.

关键词： Binary alloys

Weyl Semimetals: from Principles, Materials to Applications

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arXiv 2025年

作者： Zhong, Mengyuan Vu, Nam Thanh Trung Zhai, Wenhao Soh, Jian Rui Liu, Yuanda Wu, Jing Suwardi, Ady Liu, Huajun Chang, Guoqing Loh, Kian Ping Gao, Weibo Qiu, Cheng-Wei Yang, Joel K.W. Dong, Zhaogang 2 Fusionopolis Way Innovis #08-03 Singapore138634 Singapore Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore 2 Fusionopolis Way Innovis #08-03 Singapore138634 Singapore School of Electronic Science & Engineering Southeast University Nanjing211189 China Department of Electronic Engineering The Chinese University of Hong Kong Sha Tin New Territories Hong Kong999077 Hong Kong Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore117543 Singapore Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore117576 Singapore Singapore University of Technology and Design Singapore487372 Singapore

Weyl semimetals have attracted significant interest in condensed matter physics and materials science, due to their unique electronic and topological properties. These characteristics not only deepen our understanding of fundamental quantum phenomena, but also make Weyl semimetals promising candidates for advanced applications in electronics, photonics, and spintronics. This review provides a systematic overview of the field, covering theoretical foundations, material synthesis, engineering strategies, and emerging device applications. We first outline the key theoretical principles and distinctive properties of Weyl semimetals, followed by an examination of recent advancements that enhance their functional versatility. Finally, we discuss the critical challenges hindering their practical implementation and explore future development directions, along with the potential for expanding and enhancing their existing range of applications. By integrating discussions of both opportunities and obstacles, this review offers a balanced perspective on current progress and future directions in Weyl semimetal research. © 2025, CC BY-NC-ND.

关键词： Quantum interference phenomena

Correction: Common Subtype of Small Renal Mass MR Imaging Characterisation: A Medical Center Experience in Taiwan

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Journal of Medical and Biological engineering 2023年第4期43卷 495-496页

作者： Liu, Ming-Cheng Liu, Yi-Jui Lin, Yen-Ting Hung, Siu-Wan Chai, Jyh-Wen Chan, Si-Wa Chiu, Kun-Yuan Chang, Chih-Hao Tsou, Ya-Ling Department of Radiology Taichung Veterans General Hospital Taichung Taiwan Ph.D. Program of Electrical and Communications Engineering Feng Chia University Taichung Taiwan Department of Automatic Control Engineering Feng Chia University Taichung Taiwan Institute of Clinical Medicine National Yang-Ming University Taipei Taiwan Department of Veterinary Medicine National Chung Hsing University Taichung Taiwan School of Medical Imaging and Radiological Sciences Chung Shan Medical University Taichung Taiwan Department of Medical Imaging Taichung Tzu Chi Hospital Buddhist Tzu Chi Medical Foundation Taichung Taiwan School of Medicine Tzu Chi University Hualien Taiwan Department of Medical Imaging Radiological Science Central Taiwan University of Science and Technology Taichung Taiwan Division of Urology Department of Surgery Taichung Veterans General Hospital Taichung Taiwan Department of Applied Chemistry National Chi Nan University Nantou Taiwan Nagoya University Nagoya Japan

Chemical exchange saturation transfer MRI-trackable peptide hydrogel for drug release monitoring and targeted therapy in inflammatory bowel disease

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Cell Biomaterials

Cell Biomaterials 2025年

作者： Fenfen Li Ronghua Zhao Weiping Ding Jinying Yang Qingqing Wen Weiqiang Dou Lin Chen Jia Zhang Bensheng Qiu Jeff W.M. Bulte Yue Yuan Medical Imaging Center Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei China Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of China Hefei China GE Healthcare MR Research China Beijing China Department of Electronic Science Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance School of Electronic Science and Engineering Xiamen University Xiamen China Institute of Intelligent Machines Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei China Russell H. Morgan Department of Radiology and Radiological Science Division of MR Research and Cellular Imaging Section and Vascular Biology Program Institute for Cell Engineering The Johns Hopkins University School of Medicine Baltimore MD USA

Hydrogel formulations hold promise for efficient drug delivery in inflammatory bowel disease (IBD) treatment. Non-invasive in vivo spatiotemporal profiling of drug release is highly warranted but clinically difficult due to the need of additional labeling. We have developed an inflammation-targeting olsalazine-conjugated peptide hydrogel (Olsa-Hydrogel) that serves as an exchange saturation transfer magnetic resonance imaging (CEST MRI) activatable prodrug system. Upon conversion of the prodrug Olsa to mesalazine (Mesa), a strong MesaCEST signal could be observed at 8.5 ppm offset from water using a 3.0 T clinical scanner. Rectal administration of Olsa-Hydrogel to inflamed colonic mucosa in a mouse model of IBD led to activation of the MesaCEST signal upon enzymatic release of Mesa, enabling real-time visualization of the drug release process. This was accompanied by a significant improvement in pathophysiological symptoms. The CEST MRI-activatable peptide hydrogel offers a promising strategy for developing targeted drug delivery systems in disease-specific theranostics.

关键词： Inflammatory bowel disease peptide hydrogel targeted therapy CEST MRI drug release monitoring self-assembly enzyme-responsive drug delivery