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Ta-Doped Sb2Te Allows Ultrafast Phase-Change Memory with Excellent High-Temperature Operation Characteristics

Nano-Micro Letters 2021年第2期13卷 221-231页

作者： Yuan Xue Shuai Yan Shilong Lv Sannian Song Zhitang Song State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050People’s Republic of China

Phase-change memory(PCM)has considerable promise for new applications based on von Neumann and emerging neuromorphic computing ***,a key challenge in harnessing the advantages of PCM devices is achieving high-speed operation of these devices at elevated temperatures,which is critical for the efficient processing and reliable storage of data at full ***,we report a novel PCM device based on Ta-doped antimony telluride(Sb2Te),which exhibits both high-speed characteristics and excellent high-temperature characteristics,with an operation speed of 2 ns,endurance of >106 cycles,and reversible switching at 140℃.The high coordination number of Ta and the strong bonds between Ta and Sb/Te atoms contribute to the robustness of the amorphous structure,which improves the thermal ***,the small grains in the three-dimensional limit lead to an increased energy efficiency and a reduced risk of layer segregation,reducing the power consumption and improving the long-term *** findings for this new Ta-Sb2Te material system can facilitate the development of PCMs with improved performance and novel applications.

关键词： Phase-change memory High speed Ta High-temperature operation

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Ultra-Broadband, Compact, Low-loss 3-dB Power Splitter Using Adiabatic Subwavelength Grating in Silicon-on-insulator 3

Ultra-Broadband, Compact, Low-loss 3-dB Power Splitter Using...

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3rd International Conference on Laser, Optics, and Optoelectronic technology, LOPET 2023

作者： Liu, Xiang Zhao, Yingxuan State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China University of Chinese Academy of Sciences Beijing100049 China

ISBN: (纸本)9781510667624

We propose an ultra-broadband, compact size and low loss 3-dB adiabatic subwavelength grating-based power splitter based on the silicon-on-insulator platform. Simulation results show that our proposed device has an operating bandwidth of 250 nm, covering the wavelength range from 1400 to 1650 nm, while the device size is reduced to 11 μm and the excess loss is as low as 0.22 dB. Compatible with mature CMOS process, our proposed subwavelength grating-based power splitter shows excellent potential for large-scale photonic integrated circuits. © 2023 SPIE.

关键词： Silicon photonics

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Multiple surface states,nontrivial band topology,and antiferromagnetism in GdAuAl_(4)Ge_(2)

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Chinese Physics B 2023年第7期32卷 515-520页

作者：张成成王渊张发远戎洪涛蔡永青王乐马小明郭抒陈仲佳王亚南江志诚杨逸尘刘正太叶茂林君浩梅佳伟郝占阳谢子娟陈朝宇 Shenzhen Institute for Quantum Science and Engineering(SIQSE)and Department of Physics Southern University of Science and Technology(SUSTech)Shenzhen 518055China Songshan Lake Materials Laboratory Dongguan 523000China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China International School of Microelectronics Dongguan University of TechnologyDongguan 523000China

Magnetic topological states of matter provide a fertile playground for emerging topological physics and *** current main focus is on materials whose magnetism stems from 3d magnetic transition elements,e.g.,MnBi_(2)Te_(4),Fe_(3)Sn_(2),and Co_(3)Sn_(2)S_(2).In contrast,topological materials with the magnetism from rare earth elements remain largely *** we report rare earth antiferromagnet GdAuAl_(4)Ge_(2)as a candidate magnetic topological *** resolved photoemission spectroscopy(ARPES)and first-principles calculations have revealed multiple bulk bands crossing the Fermi level and pairs of low energy surface *** to the parity and Wannier charge center analyses,these bulk bands possess nontrivial Z2 topology,establishing a strong topological insulator state in the nonmagnetic ***,the surface band pairs exhibit strong termination dependence which provides insight into their *** results suggest GdAuAl_(4)Ge_(2)as a rare earth platform to explore the interplay between band topology,magnetism and f electron correlation,calling for further study targeting on its magnetic structure,magnetic topology state,transport behavior,and microscopic properties.

关键词： magnetic topological material surface state ARPES topological invariant

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Elemental composition x-ray fluorescence analysis with a TES-based high-resolution x-ray spectrometer

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Chinese Physics B 2023年第9期32卷 67-73页

作者：吴秉骏夏经铠张硕傅强章辉谢晓明刘志 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center for Transformative Science ShanghaiTech UniversityShanghai 201210China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Center for Excellence in Superconducting Electronics Chinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China

The accurate analysis of the elemental composition plays a crucial role in the research of functional *** emitting characteristic x-ray fluorescence(XRF)photons can be used for precisely discriminating the specified *** detection accuracy of conventional XRF methodology using semiconductor detector is limited by the energy resolution,thus posing a challenge in accurately scaling the actual energy of each XRF *** adopt a novel high-resolution x-ray spectrometer based on the superconducting transition-edge sensor(TES)for the XRF spectroscopy measurement of different *** including high energy resolution,high detection efficiency and precise linearity of the new spectrometer will bring significant benefits in analyzing elemental composition via *** this paper,we study the Ledge emission line profiles of three adjacent rare earth elements with the evenly mixed sample of their oxide components:terbium,dysprosium and *** orders of magnitude better energy resolution are obtained compared to a commercial silicon drift *** this TES-based spectrometer,the spectral lines overlapped or interfered by background can be clearly distinguished,thus making the chemical component analysis more accurate and quantitative.A database of coefficient values for the line strength of the spectrum can then be constructed *** with the novel XRF spectrometer and an established coefficient database,a direct analysis of the composition proportion of a certain element in an unknown sample can be achieved with high accuracy.

关键词： x-ray emission spectra and fluorescence superconducting transition-edge sensor rare earth elements chemical composition analysis

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Low phase noise K-band signal generation using polarization diverse single-soliton integrated microcombs

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Photonics Research 2024年第6期12卷 1175-1185页

作者： ALWALEED ALDHAFEERI HSIAO-HSUAN CHIN TRISTAN MELTON DONG IL LEE ALLEN CHU WENTING WANG MINGBIN YU PATRICK GUO-QIANG LO DIM-LEE KWONG CHEE WEI WONG Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCalifornia 90095USA Institute of Microelectronics A*STARSingapore 117865Singapore State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technologyand Shanghai Industrial Technology Research InstituteShanghai 200050China

Frequency microcombs with microwave and millimeter-wave repetition rates provide a compact solution for coherent communication and information *** implementation of these microcombs using a CMOS-compatible platform further paves the way for large-scale photonic integration and ***,we demonstrate free-running soliton microcombs with K-band repetition rates with very low phase noise over a 4 GHz pump detuning range reaching−117(−123)dBc/Hz at 10 kHz offset for a 19.7(10)GHz carrier without active pump stabilization,exceeding commercial electronic microwave oscillators at frequency offsets above 40 *** minimum laser noise to soliton microwave signal transduction factor observed is−*** noise performance is achieved using a hybridized dual-mode for soliton generation to achieve passive thermal stabilization and minimal soliton spectrum shift from prior Raman scattering and dispersive wave *** further examine the locking of the repetition rate to an external ultrastable photonic oscillator to illustrate the feasibility of phase noise suppression below the thermorefractive noise limits of microresonator frequency combs.

关键词： pump polarization millimeter

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Extremely fast vortex dynamics in Bi_(2)Sr_(2)Ca_(2)Cu_(3)O_(10+δ) crystalline nanostrip

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Chinese Physics B 2023年第6期32卷 563-568页

作者：于奥博林成天张孝富尤立星 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Max Planck Institute for Solid State Research Heisenbergstrasse 1D-70569 StuttgartGermany

The maximum velocity of a mobile vortex in movement is generally limited by the phenomenon of flux-flow instability(FFI),which necessitates weak vortex pinning and fast heat removal from non-equilibrium *** here demonstrate exfoliations and nano-fabrications of Bi_(2)Sr_(2)Ca_(2)Cu_(3)O_(10+δ) crystalline nanostrips,which possess a rather weak pinning volume of vortices,relatively low resistivity,and large normal electron diffusion *** deduced vortex velocity in Bi_(2)Sr_(2)Ca_(2)Cu_(3)O_(10+δ) crystalline nanostrips can be up to 300 km/s near the superconducting transition temperature,well above the speed of *** observed vortex velocity is an order of magnitude faster than that of conventional superconducting systems,representing a perfect platform for exploration of ultra-fast vortex matter and a good candidate for fabrications of superconducting nanowire single photon detectors or superconducting THz modulator.

关键词： Bi_(2)Sr_(2)Ca_(2)Cu_(3)O_(10+δ)(Bi2223) vortices dynamics ultra thin single crystal nanowire

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Anisotropy of 2H-NbSe_(2)in the superconducting and charge density wave states

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Chinese Physics B 2023年第4期32卷 593-597页

作者：张驰乔山肖宏胡涛 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Beijing Academy of Quantum Information Sciences Beijing 100193China Center for High Pressure Science and Technology Advanced Research Beijing 100094China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China University of Chinese Academy of Sciences Beijing 100049China

Anisotropy is an important feature of layered materials,and a large anisotropy is usually related to the two-dimensional charac *** investigated the anisotropy of the layered transition metal dicalcogenide 2H-NbSe_(2)in the superconducting and charge density wave(CDW)states using magnetotransport *** the superconducting state,the normalized H_(c2)^(‖c)/H_(p)is independent of the thickness of 2H-NbSe_(2),while H_(c2)^(‖ab)/H_p increases significantly with decreasing thickness,where H_p is the Pauli limiting magnetic field and H_(c2)^(‖c)anu H_(c2)^(‖ab)are the upper critical fields in the c and ab directions,*** is found that the superconducting anisotropy parameterγH_(c2)=H_(c2)^(‖ab)/H_(c2)^(‖c)increases with reduction in the thickness of 2H-NbSe_(2).In the CDW state,the angular(θ)dependence of magnetoresistance,R(H,θ)scales with H(cos^(2)θ+γ_(CDW)^(-2)sin^(2)θ)^(1/2),which decreases with increasing temperature and disappears at about 40 *** is found that the CDW anisotropy parameterγ_(CDW)is much larger than the effective mass anisotropy but does not change a lot for ultrathin and bulk *** results suggest the existence of three-dimensional superconductivity and quasi-two dimensional CDWs in bulk 2H-NbSe_(2).

关键词： anisotropy superconductivity charge density wave transition metal dicalcogenides

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The evolution of local structure of Mo6S8 during Li+ electrochemical storage studied by in-situ tender X-ray absorption spectroscopy

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Progress in Natural Science:Materials International 2022年第6期32卷 739-744页

作者： Pengfei Yu Yujian Xia Xuefei Feng Shun Zheng Guoxi Ren Nian Zhang Xiaosong Liu Cheng Chen Xiangxin Guo State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences National Synchrotron Radiation Laboratory University of Science and Technology of China University of Chinese Academy of Sciences Tianmu Lake Institute of Advanced Energy Storage Technologies School of Physical Science and Technology Shanghai Tech University Shanghai BYD Co. Ltd. College of Physics Qingdao University

Chevrel phase Mo6S8has attracted great interest because of its capability to accommodate different types of small cations through reversible topotactic redox ***,the intercalation mechanism of Mo6S8is still far from being fully understood owing to the complexity of the crystal structure and limitation of the probe *** our study,the reaction mechanism of Li+intercalation into Mo6S8was studied as a model by in-situ tender X-ray absorption spectroscopy（itXAS） in the viewpoint of local *** to the isobestic points of the 1st derivative,the discharge process is divided into five regions while the charge process is divided into four regions,where most of the regions are assigned to the two-phase transition *** intensity change of the two spectroscopic features of the 1st derivative is found to be correlated,implying that the intercluster bond length directly affects the localization of the unoccupied states of the intracluster *** asymmetric evolution of the intensity of a' and b' as well as the asymmetric partition of reaction regions demonstrate the asymmetry of the reaction path in discharge and charge *** results help to clarify the remaining debates on the phase ***,itXAS is demonstrated to be a powerful tool to study the reaction mechanism of *** is complementary to NMR,XRD and so on.

关键词： Chevrel phases Cathode materials X-ray absorption In-situ measurement Local structure

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Dark-Pulse Kerr Comb Enabled Ultrafast Terahertz Wireless Communication

Dark-Pulse Kerr Comb Enabled Ultrafast Terahertz Wireless Co...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Zheng, Yi Kong, Deming Jia, Shi Zhou, Liping Wang, Chengli Yi, Ailun Galili, Michael Morioka, Toshio Yvind, Kresten Ou, Xin Oxenløwe, Leif Katsuo Pu, Minhao DTU Electro Department of Electrical and Photonics Engineering Technical University of Denmark Kgs. LyngbyDK-2800 Denmark State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China

We demonstrate the first dark-pulse Kerr comb in the SiCOI platform and its application for terahertz wireless communication with 100.78 Gbit/s net rate per spatial channel over a 10-meter free space distance. CLEO 20... 详细信息

ISBN: (纸本)9781957171395

关键词： Optical Kerr effect

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Magnetic Topological Dirac Semimetal Transition Driven by SOC in EuMg_(2)Bi_(2)

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Chinese Physics Letters 2024年第1期41卷 63-67页

作者：王佳萌钱浩吉姜琦乔山叶茂 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Research Center for Intelligent Chips and Devices Zhejiang LabHangzhou 311121China Center for Transformative Science ShanghaiTech UniversityShanghai 201210China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

Magnetic topological semimetals have been at the forefront of condensed matter physics due to their ability to exhibit exotic transport *** the interplay between magnetic and topological orders in systems with broken time-reversal symmetry is crucial for realizing non-trivial quantum *** delve into the electronic structure of the rare-earth-based antiferromagnetic Dirac semimetal EuMg_(2)Bi_(2) using first-principles calculations and angle-resolved photoemission *** calculations reveal that the spin-orbit coupling(SOC)in EuMg_(2)Bi_(2) prompts an insulator to topological semimetal transition,with the Dirac bands protected by crystal *** linearly dispersive states near the Fermi level,primarily originating from Bi 6p orbitals,are observed on both the(001)and(100)surfaces,confirming that EuMg_(2)Bi_(2) is a three-dimensional topological Dirac *** research offers pivotal insights into the interplay between magnetism,SOC and topological phase transitions in spintronics applications.

关键词： spectroscopy topological Dirac

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