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Layered double hydroxide nanosheets via solvothermal delamination

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Journal of Energy Chemistry 2019年第8期28卷 88-94,I0004页

作者： Katarina Cermelj Kanittika Ruengkajorn Jean-Charles Buffet Dermot O’Hare Chemistry Research laboratory Department of Chemistry University of Oxford

A new solvothermal post-synthesis treatment for preparing high aspect ratio magnesium aluminium layered double hydroxides(Mg Al–LDHs) has been developed. Treating laurate-intercalated Mg Al–LDHs in pure ethanol in an autoclave for 48 h at 150 °C was found to produce delaminated MgA l–LDH nanosheets with a thickness of ~2.6 nm and an aspect ratio of ~105. It is proposed that the high pressure solvothermal process promotes the insertion of ethanol molecules into the LDH interlayer space, thereby facilitating delamination. This new post-synthesis treatment provides the opportunity for a facile, large scale route to highly delaminated high aspect ratio LDHs, which might be of interest towards novel nanomaterials for energy conversion and storage.

关键词： Layered double hydroxide Hydrophobicity Aspect ratio Solvothermal treatment Delamination

Short-pulse laser-driven x-ray radiography

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High Power Laser Science and Engineering 2016年第3期4卷 101-105页

作者： E.Brambrink S.Baton M.Koenig R.Yurchak N.Bidaut B.Albertazzi J.E.Cross G.Gregori A.Rigby E.Falize A.Pelka F.Kroll S.Pikuz Y.Sakawa N.Ozaki C.Kuranz M.Manuel C.Li P.Tzeferacos D.Lamb LULI-CNRS Ecole PolytechniqueCEA Universit Paris-Saclay UPMC Univ Paris 06 Sorbonne Universits Institute for Academic Initiatives Osaka U. clarendon laboratory University of Oxford CEA-DAM-DIF HZDR JIHT-RAS Institute of Laser Engineering Osaka U. Graduate School of Engineering Osaka U. Department of Energy Engineering Science Faculty of Engineering SciencesKyushu University Plasma Science and Fusion Center Massachusetts Institute of Technology Flash Center for Computational Science University of Chicago

We have developed a new radiography setup with a short-pulse laser-driven x-ray source. Using a radiography axis perpendicular to both long- and short-pulse lasers allowed optimizing the incident angle of the short-pulse laser on the x-ray source target. The setup has been tested with various x-ray source target materials and different laser *** to noise ratios are presented as well as achieved spatial resolutions. The high quality of our technique is illustrated on a plasma flow radiograph obtained during a laboratory astrophysics experiment on POLARs.

关键词： laboratory astrophysics short-pulse laser x-ray radiography

Pressure-Induced Topological and Structural Phase Transitions in an Antiferromagnetic Topological Insulator

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Chinese Physics Letters 2020年第6期37卷 57-65页

作者： Cuiying Pei Yunyouyou Xia Jiazhen Wu Yi Zhao Lingling Gao Tianping Ying Bo Gao Nana Li Wenge Yang Dongzhou Zhang Huiyang Gou Yulin Chen Hideo Hosono Gang Li Yanpeng Qi School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Materials Research Center for Element Strategy Tokyo Institute of TechnologyYokohama 226-8503Japan Center for High Pressure Science and Technology Advanced Research(HPSTAR) Shanghai 201203China Hawai’i Institute of Geophysics and Planetology School of Ocean and Earth Science and TechnologyUniversity of Hawai’i at ManoaHonoluluHawaii 96822USA Department of Physics Clarendon LaboratoryUniversity of OxfordOxford 0X13PUUK ShanghaiTech laboratory for Topological Physics ShanghaiTech UniversityShanghai 200031China

Recently,natural van der Waals heterostructures of(MnBi2 Te4)m(Bi2 Te3)n have been theoretically predicted and experimentally shown to host tunable magnetic properties and topologically nontrivial surface *** systematically investigate both the structural and electronic responses of MnBi2 Te4 and MnBi4 Te7 to external *** addition to the suppression of antiferromagnetic order,MnBi2 Te4 is found to undergo a metalsemiconductor-metal transition upon *** resistivity of MnBi4 Te7 changes dramatically under high pressure and a non-monotonic evolution of p(T)is *** nontrivial topology is proved to persist before the structural phase transition observed in the high-pressure *** find that the bulk and surface states respond differently to pressure,which is consistent with the non-monotonic change of the ***,a pressure-induced amorphous state is observed in MnBi2 Te4,while two high-pressure phase transitions are revealed in MnBi4 *** combined theoretical and experimental research establishes MnBi2 Te4 and MnBi4 Te7 as highly tunable magnetic topological insulators,in which phase transitions and new ground states emerge upon compression.

关键词： nontrivial topological resistivity

Adiabaticity in state preparation for spin squeezing of large atom ensembles

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Photonics Research 2021年第11期9卷 2296-2302页

作者： SHENCHAO JIN HAN BAO JUNLEI DUAN XINGDA LU MINGFENG WANG KAI-FENG ZHAO HENG SHEN YANHONG XIAO Department of Physics State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education)Fudan UniversityShanghai 200433China State Key laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser Spectroscopyand Collaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China Department of Physics Wenzhou UniversityWenzhou 325035China Applied Ion Beam Physics laboratory Key Laboratory of the Ministry of Educationand Institute of Modern PhysicsFudan UniversityShanghai 200433China State Key laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-electronicsand Collaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China clarendon laboratory University of OxfordOxford0X13PUUK

Spin-squeezed state is a many-body entangled state of great interest for precision *** the absolute sensitivity at the standard quantum limit is better for a larger atom number,the greater dominance of classical noises over atom projection noise makes it harder to achieve spin ***,we show both theoretically and experimentally that adiabatic pulse control of the pump field in state preparation is indispensable to sufficient noise suppression,which is the prerequisite for spin *** technique is generally applicable to spin-squeezing experiments involving a large ensemble and is thus of significance for quantum metrolog yapplications.

关键词： ensemble state preparation

Influence of Halide Choice on Formation of Low-Dimensional Perovskite Interlayer in Efficient Perovskite Solar Cells

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Energy & Environmental Materials 2022年第2期5卷 670-682页

作者： Xueping Liu Thomas Webb Linjie Dai Kangyu Ji Joel A.Smith Rachel C.Kilbride Mozhgan Yavari Jinxin Bi Aobo Ren Yuanyuan Huang Zhuo Wang Yonglong Shen Guosheng Shao Stephen J.Sweeney Steven Hinder Hui Li David G.Lidzey Samuel D.Stranks Neil C.Greenham S.Ravi P.Silva Wei Zhang State Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM) Zhengzhou UniversityZhengzhou 450001China Advanced Technology Institute Department of Electrical and Electronic EngineeringUniversity of SurreyGuildford GU27XHUK Cavendish laboratory University of CambridgeCambridge CB30HEUK Department of Chemical Engineering and Biotechnology University of CambridgeCambridge CB30ASUK Department of Physics and Astronomy University of SheffieldSheffield S37RHUK Department of Physics University of OxfordClarendon LaboratoryOxford OX13PUUK Advanced Technology Institute and Department of Physics University of SurreyGuildford GU27XHUK The Surface Analysis laboratory Department of Mechanical Engineering SciencesUniversity of SurreyGuildford GU27XHUK Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China

Recent advances in heterojunction and interfacial engineering of perovskite solar cells(PSCs)have enabled great progress in developing highly efficient and stable ***,the effect of halide choice on the formation mechanism,crystallography,and photoelectric properties of the lowdimensional phase still requires further detailed *** this work,we present key insights into the significance of halide choice when designing passivation strategies comprising large organic spacer salts,clarifying the effect of anions on the formation of quasi-2D/3D *** demonstrate the importance of halide influences,we employ novel neo-pentylammonium halide salts with different halide anions(neoPAX,X=I,Br,or Cl).We find that regardless of halide selection,iodide-based(neoPA)_(2)(FA)_((n-1))PbnI_((3n+1))phases are formed above the perovskite substrate,while the added halide anions diffuse and passivate the perovskite *** addition,we also find the halide choice has an influence on the degree of dimensionality(n).Comparing the three halides,we find that chloride-based salts exhibit superior crystallographic,enhanced carrier transport,and extraction compared to the iodide and bromide *** a result,we report high power conversion efficiency in quasi-2D/3D PSCs,which are optimal when using chloride salts,reaching up to 23.35%,and improving long-term stability.

关键词： carrier dynamics halide anions(I Br Cl) neo-pentylammonium halides perovskite solar cells quasi-2D/3D heterojunction

Operational effects of the UNOT gate on classical and quantum correlations

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Science Bulletin 2018年第12期63卷 765-770页

作者： Kuan Zhang Jiajun Ma Xiang Zhang Jayne Thompson Vlatko Vedral Kihwan Kim Mile Gu Center for Quantum Information Institute for Interdisciplinary Informotion SciencesTsinghua UniversityBeijing 100084China Department of Atomic and Laser Physics.clarendon laboratory University of OxfordOxford OX1 3PUUK Department of Physics Renmin University of ChinaBeijing 100872China Centre for Quantum Technologies National University of SingaporeSingapore 117543Singapore Department of Physics Notional University of SingaporeSingapore 117551Singapore School of Mathematical and Physical Sciences Nanyang Technological UniversitySingapore 637371Singapore Complexity Institute Nanyang Technological UniversitySingapore 637335Singapore

The NOT gate that flips a classical bit is ubiquitous in classical information *** its quantum analogue,the universal NOT(UNOT) gate that flips a quantum spin in any alignment into its antipodal counterpart is strictly *** we explore the connection between this discrepancy and how UNOT gates affect classical and quantum *** show that while a UNOT gate always preserves classical correlations between two spins,it can non-locally increase or decrease their shared discord in ways that allow violation of the data processing *** experimentally illustrate this using a multi-level trapped ^(171)Yb^+ ion that allows simulation of anti-unitary operations.

关键词： Quantum information Universal NOT gate Quantum correlations Quantum discord Data processing inequality Embedding quantum simulation Ion trap

Experimental Device-independent Tests of Quantum Measurements

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Experimental Device-independent Tests of Quantum Measurement...

Variational algorithms for linear algebra

第十八届全国量子光学学术会议

作者： Aonan Zhang 谢杰 Michele Dall'Arno Francesco Buscemi Huichao Xu Kaimin Zheng Han Zhang Vlatko Vedral Lijian Zhang College of Engineering and Applied Sciences and School of Physics Nanjing University 南京大学 Graduate School of Informatics Nagoya University Atomic and Laser Physics Clarendon LaboratoryUniversity of Oxford

The certification of a theoretical model for quantum measurements is of vital importance in quantum information tasks. However, such certification usually relies on extra assumptions on the state-generating devices. Recently, the device-independent（DI） way of testing quantum measurements has been introduced and the set of input-output correlation compatible with any qubit measurement has been fully characterized. Here we implement two kinds of important measurements in quantum information science, the mutually unbiased bases（MUBs） and symmetric informationally complete（SIC） measurements, with practical photonic apparatus, and experimentally test them in a DI way with the theoretical hypotheses and their reconstructed measurements using conventional quantum detector tomography. In particular, we develop and demonstrate a novel way of characterizing quantum measurements motivated by the DI test, relaxing assumptions on the preparation apparatus. Our results open a new avenue in the fundamental issue of characterizing quantum measurements, and pave the way to novel tools for quantum information science and applications.

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来源： cnki会议评论

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Science Bulletin 2021年第21期66卷 2181-2188,M0003页

作者： Xiaosi Xu Jinzhao Sun Suguru Endo Ying Li Simon C.Benjamin Xiao Yuan Center on Frontiers of Computing Studies Department of Computer Science.Peking UniversityBeijing 100871China Department of Materials University of OxfordOxford 0X13PHUK clarendon laboratory University of OxfordOxford 0X13PUUK Graduate School of China Academy of Engineering Physics Beijing 100193China

Quantum algorithms have been developed for efficiently solving linear algebra ***,they generally require deep circuits and hence universal fault-tolerant quantum *** this work,we propose variational algorithms for linear algebra tasks that are compatible with noisy intermediate-scale quantum *** show that the solutions of linear systems of equations and matrix–vector multiplications can be translated as the ground states of the constructed *** on the variational quantum algorithms,we introduce Hamiltonian morphing together with an adaptive ans?tz for efficiently finding the ground state,and show the solution *** algorithms are especially suitable for linear algebra problems with sparse matrices,and have wide applications in machine learning and optimisation *** algorithm for matrix multiplications can be also used for Hamiltonian simulation and open system *** evaluate the cost and effectiveness of our algorithm through numerical simulations for solving linear systems of *** implement the algorithm on the IBM quantum cloud device with a high solution fidelity of 99.95%.

关键词： Quantum computing Quantum simulation Linear algebra Matrix multiplication Variational quantum eigensolver

Electronic origin of the enhanced thermoelectric efficiency of CuSe

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Science Bulletin 2020年第22期65卷 1888-1893,M0003页

作者： Shucui Sun Yiwei Li Yujie Chen Xiang Xu Lu Kang Jingsong Zhou Wei Xia Shuai Liu Meixiao Wang Juan Jiang Aiji Liang Ding Pei Kunpeng Zhao Pengfei Qiu Xun Shi Lidong Chen Yanfeng Guo Zhengguo Wang Yan Zhang Zhongkai Liu Lexian Yang Yulin Chen State Key laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Department of Physics Clarendon LaboratoryUniversity of OxfordOxford OX13PUUK School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China State Key laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China ShanghaiTech laboratory for Topological Physics Shanghai 200031China Frontier Science Center for Quantum Information Beijing 100084China

Thermoelectric materials(TMs)can uniquely convert waste heat into electricity,which provides a potential solution for the global energy crisis that is increasingly *** Cu2Se,with ionic conductivity of Cu ions,exhibits a significant enhancement of its thermoelectric figure of merit z T by a factor of^3 near its structural transition around 400 ***,we show a systematic study of the electronic structure of Cu2Se and its temperature evolution using high-resolution angle-resolved photoemission *** heating across the structural transition,the electronic states near the corner of the Brillouin zone gradually disappear,while the bands near the centre of Brillouin zone shift abruptly towards high binding energies and develop an energy ***,the observed band reconstruction well reproduces the temperature evolution of the Seebeck coefficient of Cu2 Se,providing an electronic origin for the drastic enhancement of the thermoelectric performance near 400 *** current results not only bridge among structural phase transition,electronic structures and thermoelectric properties in a condensed matter system,but also provide valuable insights into the search and design of new generation of thermoelectric materials.

关键词： Thermoelectric materials Cu2Se Angle-resolved photoemission spectroscopy Seebeck coefficient Band reconstruction