检索结果-南通市图书馆

Observation of flat-band localized state in a one-dimensional diamond momentum lattice of ultracold atoms

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第1期33卷 212-217页

作者：曾超石悦然毛一屹武菲菲谢岩骏苑涛戴汉宁陈宇翱 Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Shanghai Research Center for Quantum Sciences and CAS Center for Excellence Quantum Information and Quantum Physics University of Science and Technology of ChinaShanghai 201315China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Department of Physics Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Constructuion and Manipulation Renmin University of ChinaBeijing 100872China

We investigated the one-dimensional diamond ladder in the momentum lattice platform. By inducing multiple twoand four-photon Bragg scatterings among specific momentum states, we achieved a flat band system based on the diamond model, precisely controlling the coupling strength and phase between individual lattice sites. Utilizing two lattice sites couplings, we generated a compact localized state associated with the flat band, which remained localized throughout the entire time evolution. We successfully realized the continuous shift of flat bands by adjusting the corresponding nearest neighbor hopping strength, enabling us to observe the complete localization process. This opens avenues for further exploration of more complex properties within flat-band systems, including investigating the robustness of flat-band localized states in disordered flat-band systems and exploring many-body localization in interacting flat-band systems.

关键词： diamond lattice flat band momentum lattice localized state

Observation of the density dependence of the closed-channel fraction of a 6Li superfluid

在线全文

学校读者我要写书评

暂无评论

National Science Review 2022年第10期9卷 105-111页

作者： Xiang-Pei Liu Xing-Can Yao Hao-Ze chen Xiao-Qiong Wang yu-Xuan Wang yu-ao chen Qijin chen Kathryn Levin Jian-Wei Pan Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of China Shanghai Branch CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai Research Center for Quantum Sciences James Franck Institute University of Chicago

Atomic Fermi gases provide an ideal platform for studying pairing and superfluid physics,using a Feshbach resonance between closed-channel molecular states and open-channel scattering *** particular interest is the strongly interacting *** show that the closed-channel fraction Zccprovides an effective probe for important many-body interacting effects,especially through its density dependence,which is absent from two-body theoretical *** we measure Zccas a function of interaction strength and the Fermi temperature TF in a trapped 6Li superfluid throughout the entire Bardeen-Cooper-Schrieffer-Bose-Einstein-condensate crossover,in quantitative agreement with theory when important thermal contributions outside the superfluid core are taken into *** from the deep-BEC regime,the fraction Zccis sensitive to *** particular,our data show Zcc∝TFαwith α=1/2at unitarity,in quantitative agreement with calculations of a two-channel pairing fluctuation theory,and a increases rapidly into the BCS regime,reflecting many-body interaction effects as predicted.

关键词： closed-channel fraction density dependence strongly interacting Fermi gas many-body effect

Oscillatory-like expansion of a Fermionic superfluid

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2020年第1期65卷 7-11,M0003页

作者： Xiao-Qiong Wang yu-Ping Wu Xiang-Pei Liu yu-Xuan Wang Hao-Ze chen Mudassar Maraj Youjin Deng Xing-Can Yao yu-ao chen Jian-Wei Pan Shanghai Branch National Laboratory for Physical Sciences at Microscale and Department of Modem PhysicsUniversity of Science and Technology of ChinaShanghai 201315China CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

We study the expansion behaviors of a Fermionic superfluid in a cigar-shaped optical dipole trap for the whole BEC-BCS crossover and various *** low temperature(0:06(1)T_F),the atom cloud undergoes an anisotropic hydrodynamic expansion over 30 ms,which behaves like oscillation in the horizontal *** analyzing the expansion dynamics according to the superfluid hydrodynamic equation,the effective polytropic index y of Equation-of-State(EoS)of Fermionic superfluid is *** y values show a non-monotonic behavior over the BEC-BCS crossover,and have a good agreement with the theoretical results in the unitarity and BEC *** normalized quasi-frequencies of the oscillatory expansion are measured,which drop significantly from the BEC side to the BCS side and reach a minimum value of 1.73 around 1/k_Fa=-0:*** work improves the understanding of the dynamic properties of strongly interacting Fermi gas.

关键词： Fermionic superfluid Oscillatory-like expansion BEC-BCS crossover Equation-of-State

在线全文

学校读者我要写书评

暂无评论

“精密测量物理”重大研究计划结题综述

中国科学基金 2024年第4期38卷 631-637页

作者：姜向伟刘强胡忠坤陈宇翱易俗倪培根董国轩尤力潘建伟罗俊叶朝辉国家自然科学基金委员会数学物理科学部北京100085 华中科技大学武汉430074 中国科学院精密测量科学与技术创新研究院武汉430071 中国科学技术大学合肥230026 中国科学院理论物理研究所北京100190 清华大学北京100084 中山大学广州510275

国家自然科学基金“精密测量物理”重大研究计划于2013年立项,执行期限为2014年1月至2021年12月,国家自然科学基金委员会于2023年3月对“精密测量物理”重大研究计划进行了结束评估,评估结果为“优秀”。本文介绍了“精密测量物理”重... 详细信息

国家自然科学基金“精密测量物理”重大研究计划于2013年立项,执行期限为2014年1月至2021年12月,国家自然科学基金委员会于2023年3月对“精密测量物理”重大研究计划进行了结束评估,评估结果为“优秀”。本文介绍了“精密测量物理”重大研究计划的立项背景、总体科学目标、总体布局、实施思路及总体完成情况,并概述了该领域下一步发展的建议。

关键词：重大研究计划精密测量物理时频精密测量基本常数测量基本物理规律检验量子精密测量

Spray pyrolysis-derived W-doped MoSe_(2)/rGO paper-like microspheres:optimization of microstructure and mesostructure for enhanced lithium storage

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3019-3031页

作者： Wei Wang Jun-yu chen Jie Ouyang Hong Yin ao-Jie Li Liang chen Jun-Lin Huang yu-Can Zhu Gang-Yong Li Zhao-Hui Hou Key Laboratory of Hunan Province for Advanced Carbon-based Functional Materials Hunan Institute of Science and TechnologyYueyang 414006China School of Chemistry and Chemical Engineering Hunan Institute of Science and TechnologyYueyang414006China Hunan Province Key Laboratory of Materials Surface&Interface Science and Technology Material Science and Engineering SchoolCentral South University of Forestry and TechnologyChangsha 410004China International Iberian Nanotechnology Laboratory(INL) AvMestre Jose Veiga4715-330 BragaPortuga

Two-dimensional MoSe_(2) is a promising candidate for lithium-ion battery ***,its conductivity and lithium storage volumetric effect still need to be *** this work,W-doped MoSe_(2)/rGO paper-like microspheres are successfully prepared through ultrasonic spray pyrolysis,achieving optimization at both the microstructure and mesostructure to enhance the lithium storage performance of the ***,by utilizing the similar two-dimensional structure between MoSe_(2) and rGO,self-assembly is achieved through spray pyrolysis,resulting in a well-defined van der Waals heterostructure at the interface on the microscale,enhancing the electron and ion transfer capability of the ***,the mesoscale paper-like microsphere morphology provides additional volume expansion buffering ***,W-doping not only increases the interlayer spacing of MoSe_(2)(0.73 nm),thereby reducing the diffusion resistance of Li+,but also allow for the modulation of the energy band structure of the *** functional theory(DFT)calculations confirm that W-doped MoSe_(2)/rGO exhibits the narrowest bandgap(0.892 eV).Therefore,the composite demonstrates excellent lithium storage performance,maintaining a specific capacity of 732.9 mAh·g^(-1)after 300 cycles at a current density of 1 A·g^(-1).

关键词： Molybdenum selenide Heterostructure Microspheres Li-ion batteries Kinetics

Di-and tri-methylation of histone H3K36 play distinct roles in DNA double-strand break repair

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2024年第6期67卷 1089-1105页

作者： Runfa chen Meng-Jie Zhao yu-Min Li ao-Hui Liu Ru-Xin Wang yu-Chao Mei Xuefeng chen Hai-Ning Du Hubei Key Laboratory of Cell Homeostasis College of Life SciencesTaiKang Center for Life and Medical SciencesFrontier Science Center for Immunology and MetabolismHubei Clinical Research Center of Emergency and ResuscitationEmergency Center of Zhongnan HospitalWuhan UniversityWuhan 430072China Hubei Key Laboratory of Cell Homeostasis College of Life SciencesTaiKang Center for Life and Medical SciencesFrontier Science Center for Immunology and MetabolismWuhan UniversityWuhan 430072China

Histone H3 Lys36(H3K36)methylation and its associated modifiers are crucial for DNA double-strand break(DSB)repair,but the mechanism governing whether and how different H3K36 methylation forms impact repair pathways is ***,we unveil the distinct roles of H3K36 dimethylation(H3K36me2)and H3K36 trimethylation(H3K36me3)in DSB repair via non-homologous end joining(NHEJ)or homologous recombination(HR).Yeast cells lacking H3K36me2 or H3K36me3 exhibit reduced NHEJ or HR efficiency.y Ku70 and Rfa1 bind H3K36me2-or H3K36me3-modified peptides and chromatin,*** these interactions impairs y Ku70 and Rfa1 recruitment to damaged H3K36me2-or H3K36me3-rich loci,increasing DNA damage sensitivity and decreasing repair ***,H3K36me2-enriched intergenic regions and H3K36me3-enriched gene bodies independently recruit y Ku70 or Rfa1 under DSB ***,human KU70 and RPA1,the homologs of y Ku70 and Rfa1,exclusively associate with H3K36me2 and H3K36me3 in a conserved *** findings provide valuable insights into how H3K36me2 and H3K36me3 regulate distinct DSB repair pathways,highlighting H3K36 methylation as a critical element in the choice of DSB repair pathway.

关键词： histone H3K36 methylation Ku70 RPA non-homologous end joining homologous recombination

同方期刊数据库

Research progress of permanent ferrite magnet materials

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2024年第6期31卷 1723-1762页

作者： XU Bin chen yu-feng ZHOU yu-juan LUO Bi-yun ZHONG Shou-guo LIU Xing-ao School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

Permanent ferrite magnet materials are extensively employed due to their exceptional magnetic properties and *** fast development in electromobile and household appliance industries contributes to a new progress in permanent ferrite *** paper reviews the deveolpement and progress of permanent ferrite magnet industry in recent *** emergence of new raw material,the advancement of perparation methods and manufacturing techniques,and the potential applications of permanent ferrite materials are introduced and ***,nanocrystallization plays a crucial role in achieving high performance at a low cost and reducing reliance on rare earth resources,and therefore it could be a promising development trendency.

关键词： permanent ferrite magnetic materials high-performance nanosizing

Experimental exploration of five-qubit quantum error-correcting code with superconducting qubits

在线全文

学校读者我要写书评

暂无评论

National Science Review 2022年第1期9卷 100-106页

作者： Ming Gong Xiao yuan Shiyu Wang yulin Wu Youwei Zhao chen Zha Shaowei Li Zhen Zhang Qi Zhao yunchao Liu Futian Liang Jin Lin yu Xu Hui Deng Hao Rong He Lu Simon C.Benjamin cheng-Zhi Peng Xiongfeng Ma yu-ao chen Xiaobo Zhu Jian-Wei Pan Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of China Shanghai Branch CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai Research Center for Quantum Sciences Center for Quantum Information Institute for Interdisciplinary Information Sciences Tsinghua University Department of Materials University of Oxford

Quantum error correction is an essential ingredient for universal quantum computing.D espite tremendous experimental efforts in the study of quantum error correction,to date,there has been no demonstration in the realis ation of universal quantum error-correcting code,with the subsequent verification of all key features including the identification of an arbitrary physical error,the capability for transversal manipulation of the logical state and state *** address this challenge,we experimentally realise the [5,1,3]code,the so-called smallest perfect code that permits corrections of generic single-qubit *** the experiment,having optimised the encoding circuit,we employ an array of superconducting qubits to realise the [5,1,3] code for several typical logical states including the magic state,an indispensable resource for realising non-Clifford *** encoded states are prepared with an average fidelity of 57.1(3)% while with a high fidelity of 98.6(1)% in the code ***,the arbitrary single-qubit errors introduced manually are identified by measuring the *** further implement logical Pauli operations with a fidelity of 97.2(2)% within the code ***,we realise the decoding circuit and recover the input state with an overall fidelity of 74.5(6)%,in total with 92 *** work demonstrates each key aspect of the [5,1,3] code and verifies the viability of experimental realisation of quantum error-correcting codes with superconducting qubits.

关键词： quantum error-correcting code superconducting qubit five-qubit code error detection logical operation

Facile construction of Mxene-supported niobium hydride nanoparticles toward reversible hydrogen storage in magnesium borohydride

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第9期43卷 4387-4400页

作者： ao Xia Jia-Guang Zheng Qing-Bo Zhang yu-Gang Shu cheng-Guo Yan Liu-Ting Zhang Zhan-Liang Tao Li-Xin chen School of Energy and Power Jiangsu University of Science and Technology Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai University State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang University

The facile construction of nanoscale NbHxsupported by Ti3C2（NbHx@Ti3C2） was achieved using facile ball milling strategy to improve the hydrogen desorption kinetics and reversibility of magnesium borohydride (Mg（BH4）2).The doping of 30 wt%NbHx@Ti3C2catalyst reduced the onset dehydrogenation temperature of Mg（BH4）2to 71.2℃.Additionally,the Mg（BH4）2+30NbHx@Ti3C2composite achieved remarkable hydrogen release of over 9.2 wt% at a temperature as low as 230℃,indicating unexpected dehydrogenation ***,the reversibility of NbHx@Ti3C2doped Mg（BH4）2was retained to more than 4.2 wt%after four cycles,which was increased by 68% compared to that of undoped Mg（BH4）*** strong catalysis of NbHx@Ti3C2catalyst could be attributed to the synergistic effect of NbHxand Ti3C2in hydrogen spillover and *** as a??hydrogen pump??for effective hydrogen spillover,while Ti3C2created numerous diffusion channels for hydrogen dissolution and provided the active catalytic site to facilitate the re/dehydrogenation of Mg（BH4）2.

关键词： Catalysts Hydrogen storage Magnesium borohydride Mxene