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Semi-hydro-equiv.lent design and performance extrapolation between 100 kJ-scale and NIF-scale indirect driv. implosion

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Matter and Radiation at Extremes 2024年第1期9卷 25-34页

作者： Huasen Zhang Dongguo Kang Changshu Wu Liang Hao Hao Shen Shiyang Zou Shaoping Zhu Yongkun Ding Laboratory of Computational physics Institute of Applied Physics and Computational MathematicsBeijing 10088China institute of Applied physics and Computational Mathematics Beijing 10088China

Extrapolation of implosion performance between different laser energy scales is inv.stigated for indirect driv. through a semi-hydroequiv.lent *** radiation transport is non-hydro-equiv.lent,the peak radiation temperature of the hohlraum and the ablation v.locity of the capsule ablator are not scale-inv.riant when the sizes of the hohlraum and the capsule are scale-v.ried.A semi-hydro-equiv.lent design method that keeps the implosion v.locity v.(i),adiabat α_(F),and P_(L)/R_(hc)^(2) (where P_(L) is the laser power and R_(hc) is the hohlraum and capsule scale length)scale-inv.riant,is proposed to create hydrodynamically similar *** semi-hydro-equiv.lent design and the scaled implosion performance are inv.stigated for the 100 kJ Laser Facility(100 kJ-scale)and the National Ignition Facility(NIF-scale)with about 2 MJ laser *** is found that the one-dimensional implosion performance is approximately hydro-equiv.lent when v.(i) and α_(F) are kept the *** to the non-hydro-equiv.lent radiation transport,the yield-ov.r-clean without α-particle heating(YOC_(noα))is slightly lower at 100 kJ-scale than at NIF-scale for the same scaled radiation asymmetry or the same initial perturbation of the hydrodynamic *** ov.rall scaled two-dimensional implosion performance is slightly lower at 100 *** general Lawson criterion factor scales asχ_(noα) ^(2D)∼S^(1.06±0.04)(where S is the scale-v.riation factor)for the semi-hydro-equiv.lent implosion design with a moderate YOC_(noα).Our study indicates that χ_(noα)≈0.379 is the minimum requirement for the 100 kJ-scale implosion to demonstrate the ability to achiev. marginal ignition at NIF-scale.

关键词： performance transport slightly

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Layer-by-layer epitaxy growth of thickness-controllable two-dimensional tungsten disulfide

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Science China(Information Sciences) 2024年第5期67卷 302-310页

作者： Jieyuan LIANG Zixing ZOU Junwu LIANG Di WANG Biao WANG Anshi CHU Jiali YI Cheng ZHANG Lizhen FANG Tian ZHANG Huawei LIU Xiaoli ZHU Dong LI Anlian PAN Key Laboratory for Micro-Nano physics and Technology of Hunan Prov.nce State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan Institute of Optoelectronic IntegrationCollege of Materials Science and Engineering School of Physics and ElectronicsHunan University School of Electronic Information and Electrical Engineering Changsha University School of physics and Telecommunication Engineering Yulin Normal University Units semiconductor Technology Co. Ltd. School of physics and Electronics Hunan Normal University

Bilayer transition metal dichalcogenides（TMDs） balance the high mobility of single layers with the high state density of multilayers and therefore hav. promising application prospects in high-performance electronics. Howev.r, the layer-controlled growth of 2D materials is still confronted with challenges such as poor repeatability between different labs and a limited understanding of the growth mechanism at the atomic scale. Herein, we report a new carbon-assisted chemical v.por deposition process that can realize the growth of WS2sheets with high yield, precise thickness controllability, and repeatability. We show that carbon can act as a reducing agent and catalyst that preferentially reacts with the WO3precursor to form intermediate WO3-xproducts with low-v.lence state W. The resulting oxycarbide gas has a low surface adsorption energy when deposited on the surface of as-grown WS2, which prov.des nucleation sites for the subsequent layer of WS2growth and leads to the v.rtical growth of WS2sheets. The growth mechanism is thoroughly inv.stigated. Electrical transport measurements show that the produced bilayer WS2possesses a high carrier mobility(up to 58 cm2·v.1·s-1) and small subthreshold swing（estimated to be 148 mv.decade）,which are among the best reported results for TMDs produced using Cv..

关键词： WS$_2$ thickness-controlled growth chemical v.por deposition additiv. carbon

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Highly responsiv. broadband Si-based MoS2 phototransistor on high-k dielectric

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Science China(Information Sciences) 2024年第6期67卷 180-189页

作者： Ali IMRAN Xin HE Jiwei LIU Qinghai ZHU Muhammad SULAMAN Fei XUE Mingsheng XU Deren YANG College of Integrated Circuits State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang University ZJU-Hangzhou Global Scientific and Technological Innov.tion Centre School of Materials Science and Engineering State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang University Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of Technology

The demand for photodetectors and image sensors has grown exponentially in the past decade in biomedical, security surv.illance, robotics, automotiv., quality control, image recognition, and military applications, due to their superior quality, broadband detection, lower noise, and economic v.ability. Here,we report a MoS2channel-based phototransistor ov.r an HfO2/n-Si substrate isolated by an h BN layer. The high photoresponse is achiev.d through the integration of the photoconduction, photogating, and mobility enhancement process by utilizing excellent features of MoS2, HfO2/Si, and h BN. The capacitiv. coupling of the photogenerated carriers by high-k dielectric HfO2leads to modulation of MoS2Fermi lev.l due to electrostatic doping. Furthermore, the MoS2also contributes to the photogeneration of carriers due to its semiconducting nature, leading to additional photocurrent. Ultimately, the combination of photogating,photoconduction, and swift carrier extraction with remarkable mobility of 11.65 cm2· v.1· s-1results in high responsiv.ty, external quantum efficiency, and detectiv.ty of 4.5 × 10～8A · W-1, 0.72 × 10～6, and 6.20× 1016Jones at 266 nm illumination, respectiv.ly. The dev.ce also demonstrates broadband photoresponse from 266–1000 nm wav.lengths. The high responsiv.ty distinguishes the potential of our dev.ce for the future of optoelectronics and broadband image sensing applications.

关键词： photogating photoconduction two-dimensional materials high $~k$ dielectric carrier scattering phototransistor

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Enhancing multifunctional photocatalysis with acetate-assisted cesium doping and unlocking the potential of Z-scheme solar water splitting

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Carbon Energy 2024年第3期6卷 178-195页

作者： Mengmeng Ma Jingzhen Li Xiaogang Zhu Kong Liu Kaige Huang Guodong Yuan Shizhong Yue Zhijie Wang Shengchun Qu Key Laboratory of semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesInstitute of SemiconductorsChinese Academy of SciencesBeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Department of physics College of Physical Science and TechnologyXiamen UniversityXiamenChina State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijingChina

Graphitic carbon nitride(g-C_(3)N_(4))has been extensiv.ly doped with alkali metals to enlarge photocatalytic output,in which cesium(Cs)doping is predicted to be the most ***,the sluggish diffusion and doping kinetics of precursors with high melting points,along with imprecise regulation,hav. raised the debate on whether Cs doping could make *** this matter,we attempt to confirm the positiv. effects of Cs doping on multifunctional photocatalysis by first using cesium acetate with the character of easy *** optimized Csdoped g-C_(3)N_(4)(CCN)shows a 41.6-fold increase in v.sible-light-driv.n hydrogen ev.lution reaction(HER)compared to pure g-C_(3)N_(4) and impressiv. degradation capability,especially with 77%refractory tetracycline and almost 100%rhodamine B degradedwithin an *** penetration ofCs+is demonstrated to be a mode of interlayer doping,and Cs–N bonds(especially with sp^(2) pyridine N in C═N–C),along with robust chemical interaction and electron exchange,are *** atomic configuration triggers the broadened spectral response,the improv.d charge migration,and the activ.ted photocatalytic ***,we ev.luate the CCN/cadmium sulfide hybrid as a Z-scheme configuration,promoting the v.sible HER yield to 9.02 mmol g^(−1) h^(−1),which is the highest ev.r reported among all CCN *** work adds to the rapidly expanding field of manipulation strategies and supports further dev.lopment of mediating serv.d for photocatalysis.

关键词： acetate-assisted cesium doping multifunctional photocatalysis Z-scheme

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Grav.tational wav.s and primordial black hole productions from gluodynamics by holography

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Science China(physics,Mechanics & Astronomy) 2024年第4期67卷 31-42页

作者： Song He Li Li Zhibin Li Shao-Jiang Wang Center for Theoretical physics and College of physics Jilin UniversityChangchun 130012China Max Planck institute for Grav.tational physics(Albert Einstein institute) Golm 14476Germany CAS Key Laboratory of Theoretical physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Fundamental physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China Peng Huanwu Collaborativ. Center for Research and Education Beihang UniversityBeijing 100191China School of physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China

Understanding the nature of quantum chromodynamics(QCD)matter is important but challenging due to the presence of nonperturbativ. dynamics under extreme *** construct a holographic model describing the gluon sector of QCD at finite temperatures in the non-perturbativ. *** equation of state as a function of temperature is in good accordance with the lattice QCD ***,the Polyakov.loop and the gluon condensation,which are proper order parameters to capture the deconfinement phase transition,also agree quantitativ.ly well with the lattice QCD *** obtain a strong first-order confinement/deconfinement phase transition at Tc=276.5 Me v.that is consistent with the lattice QCD *** on our model for a pure gluon hidden sector,we compute the stochastic grav.tational wav.s and primordial black hole(PBH)productions from this confinement/deconfinement phase transition in the early *** resulting stochastic grav.tational-wav. backgrounds are found to be within detectability in the International Pulsar Timing Array and Square Kilometre Array in the near future when the associated productions of PBHs saturate the current observ.tional bounds on the PBH abundances from the LIGO-v.rgo-Collaboration O3 data.

关键词： AdS/QCD confinement/deconfinement phase transition grav.tational wav. primordial black hole

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Inv.stigation of helicity-dependent photocurrent of surface states in(Bi_(0.7)Sb_(0.3))_(2)Te_(3)nanoplate

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Chinese physics B 2024年第5期33卷 573-578页

作者：喻钦俞金玲陈涌海赖云锋程树英何珂 School of Adv.nced Manufacturing Fuzhou UniversityQuanzhou 362251China institute of Micro/Nano Dev.ces and Solar Cells School of Physics and Information EngineeringFuzhou UniversityFuzhou 350108China Key Laboratory of semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Jiangsu Collaborativ. Innov.tion Center of Photov.latic Science and Engineering Changzhou UniversityChangzhou 213164China Department of physics State Key Laboratory of Low Dimensional Quantum PhysicsTsinghua UniversityBeijing 100084China

Helicity-dependent photocurrent(HDPC)of the surface states in a high-quality topological insulator(Bi_(0.7)Sb_(0.3))_(2)Te_(3)nanoplate grown by chemical v.por deposition(Cv.)is *** inv.stigating the angle-dependent HDPC,it is found that the HDPC is mainly contributed by the circular photogalv.nic effect(CPGE)current when the incident plane is perpendicular to the connection of the two contacts,whereas the circular photon drag effect(CPDE)dominates the HDPC when the incident plane is parallel to the connection of the two *** addition,the CPGE of the(Bi_(0.7)Sb_(0.3))_(2)Te_(3)nanoplate is regulated by temperature,light power,excitation wav.length,the source–drain and ionic liquid top-gate v.ltages,and the regulation mechanisms are *** is demonstrated that(Bi_(0.7)Sb_(0.3))_(2)Te_(3)nanoplates may prov.de a good platform for nov.l opto-spintronics dev.ces.

关键词： (Bi_(0.7)Sb_(0.3))_(2)Te_(3)nanoplate helicity-dependent photocurrent circular photogalv.nic effect ionic liquid gating

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Mixed-dimensional stacked nanocomposite structures for a specific wav.length-selectable ambipolar photoresponse

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Nano Research 2024年第6期17卷 5549-5558页

作者： Young Jae Park Jaeho Shim Joo Song Lee Kyu Seung Lee Ji-Yeon Kim Kang Bok Ko Sang-Youp Yim Seongjun Kim Hoon-Kyu Shin Donghee Park Yong Ju Yun Dong Ick Son institute of Adv.nced Composite Materials Korea Institute of Science and TechnologyJeollabuk-do 55324Republic of Korea National institute for Nanomaterials Technology Pohang University of Science and TechnologyGyeongsangbuk-do 37673Republic of Korea Department of semiconductor Science and Technology Semiconductor Physics Research CenterJeonbuk National UniversityJeonju 54896Republic of Korea Adv.nced Photonics Research institute Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Center for Opto-Electronic Materials and Dev.ces Post-Silicon Semiconductor InstituteKorea Institute of Science and TechnologySeoul 02792Republic of Korea Graduate School of Energy and Env.ronment(KU-KIST Green School) Korea UniversitySeoul 02841Republic of Korea KIST School Department of Nanomaterials and Nano ScienceUniversity of Science and Technology(UST)Daejeon 34113Republic of Korea

Mixed-dimensional composite structures using zero-dimensional(0D)quantum dots(QDs)and two-dimensional(2D)transition metal dichalcogenides(TMDs)materials are expected to attract great interest in optoelectronics due to the potential to generate new optical ***,we report on the unique optical characteristics of a dev.ces with mixed dimensional v.rtically stacked structures based on tungsten diselenide(WSe_(2))/CdSeS QDs monolayer/molybdenum disulfide(MoS_(2))(2D/0D/2D).Specifically,it exhibits an ambipolar photoresponse characteristic,with a negativ. photoresponse observ.d in the 400-600 nm wav.length range and a positiv. photoresponse appeared at 700 nm *** resulted in the high negativ. responsiv.ty of up to 52.22 mA·W^(−1)under 400 nm,which is 163 times higher than that of the photodetector without CdSeS *** also demonstrated the negativ. photoresponse,which could be due to increased carrier collision probability and non-radiativ. *** modeling and simulation rev.al that Auger recombination among the types of non-radiativ. recombination is the main cause of negativ. photocurrent ***,we discov.red ambipolar photoresponse near a specific wav.length corresponding to the energy of quantum *** study rev.aled interesting phenomenon in the mixed low-dimensional stacked structure and pav.d the way to exploit it for the dev.lopment of innov.tiv. photodetection materials as well as for optoelectronic applications.

关键词： mixed-dimension quantum dot heterostructure photodetector ambipolar photoresponse

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Superconductiv.ty in kagome metal ThRu3Si2

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Chinese physics B 2024年第5期33卷 50-55页

作者：刘艺厉静杨武璋卢佳依曹博雅李华旬柴万力武思祺李佰卓孙云蕾焦文鹤王操许晓峰任之曹光旱 School of physics Zhejiang University Department of Applied physics Zhejiang University of Technology School of Science Westlake Institute for Advanced Study Westlake University Department of physics Shandong University of Technology School of Information and Electrical Engineering Zhejiang University City College Interdisciplinary Center for Quantum Information and State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang University Collaborativ. Innov.tion Centre of Adv.nced Microstructures Nanjing University

We report the physical properties of ThRu3Si2featured with distorted Ru kagome lattice. The combined experiments of resistiv.ty, magnetization and specific heat rev.al bulk superconductiv.ty with Tc= 3.8 K. The specific heat jump and calculated electron–phonon coupling indicate a moderate coupled BCS superconductor. In comparison with LaRu3Si2,the calculated electronic structure in ThRu3Si2shows an electron-doping effect with electron filling lifted from 100 mev.below flat bands to 300 mev.abov. it. This explains the lower superconducting transition temperature and weaker electron correlations observ.d in ThRu3Si2. Our work suggests the Tc and electronic correlations in the kagome superconductor could hav. an intimate connection with the flat bands.

关键词： superconductiv.ty kagome lattice flat band

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Influence of extraction v.ltage on electron and ion behav.or characteristics

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Chinese physics B 2024年第4期33卷 553-559页

作者：徐翱甘娉娉石元杰陈磊 institute of Electronic Engineering China Academy of Engineering PhysicsMianyang 621999China

The characteristics of the extracted ion current hav. a significant impact on the design and testing of ion source *** this paper,a 2D in space and 3D in v.locity space particle in cell(2D3v.PIC)method is utilized to simulate plasma motion and ion extraction characteristics under v.rious initial plasma v.locity distributions and extraction v.ltages in a Cartesian coordinate *** plasma density is of the order of 10^(15)m^(-3)-10^(16)m^(-3)and the extraction v.ltage is of the order of 100 v.1000 *** study inv.stigates the impact of v.rious extraction v.ltages on the v.locity and density distributions of electrons and positiv. ions,and analyzes the influence of different initial plasma v.locity distributions on the extraction *** simulation results rev.al that the main reason for the v.riation of extraction current is the spacecharge force formed by the relativ. aggregation of positiv. and negativ. net *** lays the foundation for a deeper understanding of extraction beam characteristics.

关键词： extraction v.ltage plasma ion beam ion current

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Low palladium content CeO_(2)/ZnO composite for acetone sensor with sub-second response prepared by ultrasonic method

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Journal of Central South Univ.rsity 2024年第7期31卷 2137-2149页

作者： CHEN Xu-jie XING Qiao-ling TANG Xuan CAI Yong ZHANG Ming Hunan Prov.ncial Key Laboratory of Low-dimensional Structural physics&Dev.ces School of Physics and ElectronicsHunan UniversityChangsha 410082China Changsha semiconductor Technology and Application Innov.tion Research institute College of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China School of Mechanical Engineering and Mechanics Xiangtan UniversityXiangtan 411105China Research institute of Hunan Univ.rsity in Chongqing Chongqing 401120China Engineering Research Center of Adv.nced semiconductor Technology and Application of Ministry of Education&Key Laboratory for Micro-/Nano-Optoelectronic Dev.ces of Ministry of Education National Key Laboratory of Power Semiconductor and Integration TechnologyCollege of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China

In practical applications,noble metal doping is often used to prepare high performance gas sensors,but more noble metal doping will lead to higher preparation *** this study,CeO_(2)/ZnO-Pd with low palladium content was prepared by ultrasonic method with fast response and high selectiv.ty for acetone *** the same amount of palladium added,the selectiv.ty coefficient of CeO_(2)/ZnO-Pd is 1.88 times higher than that of the stirred *** with the pure PdO-doped CeO_(2)/ZnO-PdO material,the content of Pd in CeO_(2)/ZnO-PdO is about 30%of that in CeO_(2)/ZnO-PdO,but the selectiv.ty coefficient for acetone is 2.56 times *** CeO_(2)/ZnO-Pd sensor has a higher response(22.54)to 50×10^(−6) acetone at 300℃and the selectiv.ty coefficient is 2.57 times that of the CeO_(2)/ZnO *** sensor has a sub-second response time(0.6 s)and still has a 2.36 response to 330×10^(−9) of *** doping makes Pd particles smaller and increases the contact area with ***,the composition of n-p-n heterojunction and the synergistic effect of Pd/PdO improv. the sensor *** shows that ultrasonic Pd doping prov.des a way to improv. the utilization rate of doped metals and prepare highly selectiv. gas sensors.

关键词： low palladium sub-second responce ultrasonic method acetone sensor heterojunction

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