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science China Chemistry 2021年第2期64卷 171-203页

作者： Yongxi Zhao Xiaolei Zuo Qian Li Feng Chen Yan-Ru Chen Jinqi Deng Da Han Changlong Hao Fujian Huang Yanyi Huang Guoliang Ke Hua Kuang Fan Li Jiang Li Min Li Na Li Zhenyu Lin Dingbin Liu Juewen Liu Libing Liu Xiaoguo Liu Chunhua Lu Fang Luo Xiuhai Mao Jiashu Sun Bo Tang Fei Wang Jianbin Wang Lihua Wang Shu Wang Lingling Wu Zai-Sheng Wu Fan Xia Chuanlai Xu Yang Yang Bi-Feng Yuan Quan Yuan Chao Zhang Zhi Zhu Chaoyong Yang Xiao-Bing Zhang Huanghao Yang Weihong Tan Chunhai Fan Institute of Analytical Chemistry and Instrument for Life Science The Key Laboratory of Biomedical Information Engineering of Ministry of EducationSchool of Life Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Institute of Molecular Medicine Shanghai Key Laboratory for Nucleic Acid Chemistry and NanomedicineRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200127China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesInstitute of Translational MedicineShanghai Jiao Tong UniversityShanghai 200240China Cancer Metastasis Alert and Prevention Center Fujian Provincial Key Laboratory of Cancer Metastasis Chemoprevention and ChemotherapyState Key Laboratory of Photocatalysis on Energy and EnvironmentCollege of ChemistryFuzhou UniversityFuzhou 350108China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China State Key Lab of Food Science and Technology International Joint Research Laboratory for Biointerface and BiodetectionSchool of Food Science and TechnologyJiangnan UniversityWuxi 214122China Faculty of Materials Science and Chemistry Engineering Research Center of Nano-Geomaterials of Ministry of EducationChina University of GeosciencesWuhan 430074China College of Chemistry and Molecular Engineering Biomedical Pioneering Innovation Center(BIOPIC)Beijing Advanced Innovation Center for Genomics(ICG)Peking-Tsinghua Center for Life SciencesPeking UniversityBeijing 100871China State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Division of Physical Biology CAS Key Laboratory of Interfacial Physics and TechnologyShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China Bioimaging Center Shanghai Synchrotron Radiation FacilityZhangjiang LaboratoryShanghai Advanced

Nucleic acids are natural biopolymers of nucleotides that store, encode, transmit and express genetic information, which play central roles in diverse cellular events and diseases in living things. The analysis of nucleic acids and nucleic acids-based analysis have been widely applied in biological studies, clinical diagnosis, environmental analysis, food safety and forensic *** the past decades, the field of nucleic acids analysis has been rapidly advancing with many technological *** this review, we focus on the methods developed for analyzing nucleic acids, nucleic acids-based analysis, device for nucleic acids analysis, and applications of nucleic acids analysis. The representative strategies for the development of new nucleic acids analysis in this field are summarized, and key advantages and possible limitations are discussed. Finally, a brief perspective on existing challenges and further research development is provided.

关键词： nucleic acids analysis signal amplification DNA nanotechnology aptamer biosensing

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Kinetic analysis of thermally induced polymorphic transition in HMX using terahertz spectroscopy

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Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy 2025年 343卷 126515页

作者： Liu, Quancheng Su, Hang Li, Xiaoxia Zhang, Zhengwen Li, Lingdi Zhang, Qi School of Information and Control Engineering Southwest University of Science and Technology Mianyang621010 China Tianfu Institute of Research and Innovation Southwest University of Science and Technology Chengdu610200 China Physical and Chemical Testing Center Gansu Yinguang Chemical Group Co. Ltd. Baiyin730900 China Institute of Chemical Materials China Academy of Engineering Physics Mianyang621022 China

Understanding the kinetics of polymorphic transitions is critical for predicting and controlling phase behavior in functional materials. Although terahertz spectroscopy has been established as a reliable technique for identifying polymorphic forms, its application in analyzing transition kinetics remains underexplored. In this study, terahertz time-domain spectroscopy (THz-TDS) was employed to monitor the thermally induced β-to-δ polymorphic transition in HMX. Principal component analysis enabled segmentation of the spectral evolution, allowing precise identification of intermediate transformation stages. Density functional theory calculations, combined with analysis of thermally activated anharmonic vibrational modes, revealed that nitro-group motion facilitates the transition by lowering activation barriers. A logistic relationship between absorption intensity and transformation time was observed, consistent with a cooperative nucleation-and-growth mechanism governed by thermal input. These results demonstrate the capacity of THz spectroscopy to dynamically monitor polymorphic transition kinetics at the molecular level. © 2025 Elsevier B.V.

关键词： Terahertz spectroscopy

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Strain-induced resonances in the dynamical quadratic magnetoelectric response of multiferroics

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npj Computational Materials 2020年第1期6卷 1156-1161页

作者： S.Omid Sayedaghaee Charles Paillard Sergey Prosandeev Bin Xu Laurent Bellaiche Physics Department and Institute for Nanoscience and Engineering University of ArkansasFayettevilleArkansas 72701USA Microelectronics-Photonics Program University of ArkansasFayettevilleArkansas 72701USA Laboratoire Structures Propriétés et Modélisation des SolidesCentraleSupélecCNRS UMR 8580UniversitéParis-Saclay91190 Gifsur-YvetteFrance Institute of Physics and Physics Department of Southern Federal University Rostov-na-Donu 344090Russia School of Physical Science and Technology Soochow UniversitySuzhouJiangsu 215006China

For the last few years,the research interest in magnetoelectric(ME)effect,which is the cross-coupling between ferroelectric and magnetic ordering in multiferroic materials,has experienced a significant *** extensive recent studies are not only conducted towards the design of sensors,actuators,transducers,and memory devices by taking advantage of the cross-control of polarization(or magnetization)by magnetic(or electric)fields,but also aim to create a clearer picture in understanding the sources of ME responses and the novel effects associated with *** we derive analytical models allowing to understand the striking and novel dynamics of ME effects in multiferroics and further confirm it with atomistic ***,the role of strain is revealed to lead to the existence of electroacoustic magnons,a new quasiparticle that mixes acoustic and optical phonons with magnons,which results in resonances and thus a dramatic enhancement of magnetoelectric ***,a unique aspect of the dynamical quadratic ME response under a magnetic field with varying frequencies,which is the second harmonic generation(SHG),has not been discussed prior to the present *** SHGs put emphasis on the fact that nonlinearities should be considered while dealing with such systems.

关键词： quadratic dynamical resonance

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Reconfiguring confined magnetic colloids with tunable fluid transport behavior

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National science Review 2021年第5期8卷 147-157页

作者： Zhizhi Sheng Mengchuang Zhang Jing Liu Paolo Malgaretti Jianyu Li Shuli Wang Wei Lv Rongrong Zhang Yi Fan Yunmao Zhang Xinyu Chen Xu Hou State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen University Collaborative Innovation Center of Chemistry for Energy Materials Xiamen University Department of Physics Research Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Functional Materials ResearchJiujiang Research InstituteCollege of Physical Science and TechnologyXiamen University Max Planck Institute for Intelligent Systems IV Institute for Theoretical Physics University of Stuttgart Department of Mechanical Engineering McGill University Department of Biomedical Engineering McGill University Tan Kah Kee Innovation Laboratory

Collective dynamics of confined colloids are crucial in diverse scenarios such as self-assembly and phase behavior in materials science, microrobot swarms for drug delivery and microfluidic control. Yet,fine-tuning the dynamics of colloids in microscale confined spaces is still a formidable task due to the complexity of the dynamics of colloidal suspension and to the lack of methodology to probe colloids in confinement. Here, we show that the collective dynamics of confined magnetic colloids can be finely tuned by external magnetic fields. In particular, the mechanical properties of the confined colloidal suspension can be probed in real time and this strategy can be also used to tune microscale fluid transport. Our experimental and theoretical investigations reveal that the collective configuration characterized by the colloidal entropy is controlled by the colloidal concentration, confining ratio and external field strength and direction. Indeed, our results show that mechanical properties of the colloidal suspension as well as the transport of the solvent in microfluidic devices can be controlled upon tuning the entropy of the colloidal suspension. Our approach opens new avenues for the design and application of drug delivery, microfluidic logic, dynamic fluid control, chemical reaction and beyond.

关键词： confined magnetic colloids entropy pressure threshold fluid transport liquid gating technology

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Orbital-selective band modifications in a charge-ordered kagome metal LuNb6Sn6

arXiv

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arXiv 2025年

作者： Lou, Rui Zhang, Yumeng Cheng, Erjian Feng, Xiaolong Fedorov, Alexander Li, Zongkai Luo, Yixuan Generalov, Alexander Ma, Haiyang Wei, Quanxing Zhou, Yi Changdar, Susmita Schnelle, Walter Chen, Dong Chen, Yulin Liu, Jianpeng Guo, Yanfeng Borisenko, Sergey Vyalikh, Denis V. Felser, Claudia Büchner, Bernd Liu, Zhongkai Leibniz Institute for Solid State and Materials Research IFW Dresden Dresden01069 Germany Helmholtz-Zentrum Berlin für Materialien und Energie Albert-Einstein-Straße 15 Berlin12489 Germany Joint Laboratory "Functional Quantum Materials" BESSY II Berlin12489 Germany School of Physical Science and Technology ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai201210 China Zhangjiang Laboratory 100 Haike Road Pudong Shanghai201210 China Max Planck Institute for Chemical Physics of Solids Dresden01187 Germany MAX IV Laboratory Lund University Fotongatan 2 Lund224 84 Sweden Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Shenzhen518045 China College of Physics Qingdao University Qingdao266071 China Department of Physics University of Oxford OxfordOX1 3PU United Kingdom Donostia-San Sebastián20018 Spain IKERBASQUE Basque Foundation for Science Bilbao48011 Spain Institute of Solid State and Materials Physics TU Dresden Dresden01062 Germany

The origin of the charge order in kagome lattice materials has attracted great interest due to the unique electronic structure features connected to kagome networks and the interplay between electron and lattice degrees of freedom. Recently, compounds with composition LnNb6Sn6 (Ln = Ce-Nd, Sm, Gd-Tm, Lu, Y) appear as a new family of kagome metals, structurally analogous to RV6Sn6 (R = Sc, Y, or rare earth) systems. Among them, LuNb6Sn6 emerges as a novel material hosting charge density wave (CDW) with a √3 × √3 × 3 wave vector, akin to that in ScV6Sn6. Here, we employ high-resolution angle-resolved photoemission spectroscopy, scanning tunneling microscopy, and density functional theory calculations to systematically investigate the electronic properties of LuNb6Sn6. Our observation reveals the characteristic band structures of the "166" kagome system. A charge instability driven by Fermi surface nesting is decisively ruled out through an analysis of the interactions between van Hove singularities. Across the CDW transition, we observe orbital-selective band modifications, with noticeable evolutions of Lu 5d and Sn 5p electrons, while Nb 4d electrons exhibit minimal change, suggesting that the Lu and Sn sites other than the Nb kagome lattice play a key role in the formation of CDW. Our findings substantiate a universal lattice-driven CDW mechanism rather than a charge-instability-driven one in the "166" kagome compounds, making it a distinct material class compared to other charge-ordered kagome systems, such as AV3Sb5 (A = K, Rb, Cs) and FeGe. Copyright © 2025, The Authors. All rights reserved.

关键词： Photoelectron spectroscopy

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An Ice Age JWST inventory of dense molecular cloud ices

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Nature Astronomy 2023年第4期7卷 431-443页

作者： McClure, M.K. Rocha, W.R.M. Pontoppidan, K.M. Crouzet, N. Chu, L.E.U. Dartois, E. Lamberts, T. Noble, J.A. Pendleton, Y.J. Perotti, G. Qasim, D. Rachid, M.G. Smith, Z.L. Sun, Fengwu Beck, Tracy L. Boogert, A.C.A. Brown, W.A. Caselli, P. Charnley, S.B. Cuppen, Herma M. Dickinson, H. Drozdovskaya, M.N. Egami, E. Erkal, J. Fraser, H. Garrod, R.T. Harsono, D. Ioppolo, S. Jiménez-Serra, I. Jin, M. Jørgensen, J.K. Kristensen, L.E. Lis, D.C. McCoustra, M.R.S. McGuire, Brett A. Melnick, G.J. Öberg, Karin I. Palumbo, M.E. Shimonishi, T. Sturm, J.A. van Dishoeck, E.F. Linnartz, H. Leiden Observatory Leiden University Leiden Netherlands Laboratory for Astrophysics Leiden Observatory Leiden University Leiden Netherlands Space Telescope Science Institute Baltimore MD United States NASA Postdoctoral Program Fellow NASA Ames Research Center Moffett Field CA United States Institut des Sciences Moléculaires d’Orsay CNRS Université Paris-Saclay Orsay France Leiden Institute of Chemistry Gorlaeus Laboratories Leiden University Leiden Netherlands Physique des Interactions Ioniques et Moléculaires CNRS Aix Marseille Université Marseille France Department of Physics University of Central Florida Orlando FL United States Max Planck Institute for Astronomy Heidelberg Germany Southwest Research Institute San Antonio TX United States School of Physical Sciences The Open University Milton Keynes United Kingdom Steward Observatory University of Arizona Tucson AZ United States Institute for Astronomy University of Hawai’i at Manoa Honolulu HI United States Department of Chemistry University of Sussex Brighton United Kingdom Max-Planck-Institut für extraterrestrische Physik Garching bei München Germany Solar System Exploration Division NASA Goddard Space Flight Center Greenbelt MD United States Radboud University Institute for Molecules and Materials Nijmegen Netherlands Center for Space and Habitability Universität Bern Bern Switzerland Departments of Astronomy and Chemistry University of Virginia Charlottesville VA United States Institute of Astronomy Department of Physics National Tsing Hua University Hsinchu Taiwan Center for Interstellar Catalysis Department of Physics and Astronomy Aarhus University Aarhus Denmark Centro de Astrobiología (CAB) CSIC-INTA Torrejón de Ardoz Spain Department of Physics Catholic University of America Washington DC United States Niels Bohr Institute University of Copenhagen Copenhagen Denmark Jet Propulsion Laboratory California Institute of Technology Pasadena CA United States Institute of

Icy grain mantles are the main reservoir of the volatile elements that link chemical processes in dark, interstellar clouds with the formation of planets and the composition of their atmospheres. The initial ice composition is set in the cold, dense parts of molecular clouds, before the onset of star formation. With the exquisite sensitivity of the James Webb Space Telescope, this critical stage of ice evolution is now accessible for detailed study. Here we show initial results of the Early Release science programme Ice Age that reveal the rich composition of these dense cloud ices. Weak ice features, including ¹³CO₂, OCN⁻, ¹³CO, OCS and complex organic molecule functional groups, are now detected along two pre-stellar lines of sight. The ¹²CO₂ ice profile indicates modest growth of the icy grains. Column densities of the major and minor ice species indicate that ices contribute between 2% and 19% of the bulk budgets of the key C, O, N and S elements. Our results suggest that the formation of simple and complex molecules could begin early in a water-ice-rich environment. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.

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Observation of Superoscillation Superlattices

arXiv

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arXiv 2024年

作者： Ma, Xin Zhang, Hao Wei, Wenjun Tai, Yuping Li, Xinzhong Shen, Yijie School of Chemistry and Chemical Engineering School of Physics and Engineering Henan University of Science and Technology Luoyang471023 China State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'An710119 China Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Luoyang471023 China Centre for Disruptive Photonic Technologies School of Physical and Mathematical Sciences The Photonics Institute Nanyang Technological University Singapore637371 Singapore School of Electrical and Electronic Engineering Nanyang Technological University Singapore639798 Singapore

Superoscillation (SO) wavefunctions, that locally oscillate much faster than its fastest Fourier component, in light waves have enhanced optical technologies beyond diffraction limits, but never been controlled into 2D periodic lattices. Here, we report the 2D superoscillation lattices (SOL) with controlled symmetries, where the local wavevector can be ~700 times larger than the global maximal wavevector (k0) in a localized region ~100 times smaller than the global minimal wavelength (λ0). We also demonstrate the superoscillation superlattices (SOSL) as twisted bilayer Moirépatterns of two SOL, akin to the magic angle tuning in advanced twistronics, we can continually tune the on-demand SO with local maximal wavevector in a range of 450k0–700k0 and with ~ λ0/100–λ0/1000. The twistronic SOSL will advance optical imaging and metrology into extreme higher-dimensional *** Codes 78 Copyright © 2024, The Authors. All rights reserved.

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Quantitative modeling of bacterial quorum sensing dynamics in time and space

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Chinese physics B 2020年第10期29卷 1-8页

作者： Xiang Li Hong Qi Xiao-Cui Zhang Fei Xu Zhi-Yong Yin Shi-Yang Huang Zhao-Shou Wang Jian-Wei Shuai Department o f Physics College o f Physical Science and TechnologyXiamen UniversityXiamen 361005China State Key Laboratory o f Cellular Stress Biology Innovation Center for Cell Signaling NetworkXiamen UniversityXiamen 361102China Complex Systems Research Center Shanxi UniversityTaiyuan 030006China Institute o f Biochemical Engineering Department o f Chemical and Biochemical EngineeringCollege o f Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China National Institute for Data Science in Health and Medicine Xiamen UniversityXiamen 361102China

Quorum sensing (QS) refers to the cell communication through signaling molecules that regulate many important biological functions of bacteria by monitoring their population density. Although a wide spectrum of studies on the QS system mechanisms have been carried out in experiments, mathematical modeling to explore the QS system has become a powerful approach as well. In this paper, we review the research progress of network modeling in bacterial QS to capture the system's underlying mechanisms. There are four types of QS system models for bacteria: the Gram-negative QS system model, the Gram-positive QS system model, the model for both Gram-negative and Gram-positive QS system, and the synthetic QS system model. These QS system models are mostly described by the ordinary differential equations (ODE) or partial differential equations (PDE) to study the changes of signaling molecule dynamics in time and space and the cell population density variations. Besides the deterministic simulations, the stochastic modeling approaches have also been introduced to discuss the noise effects on kinetics in QS systems. Taken together, these current modeling efforts advance our understanding of the QS system by providing systematic and quantitative dynamics description, which can hardly be obtained in experiments.

关键词： hacterial quorum sensing signaling molecules mathematical modeling dynamic analysis

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PANDORA Project for the study of photonuclear reactions below

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The European physical Journal A 2023年第9期59卷 1-21页

作者： Tamii, A. Pellegri, L. Söderström, P.-A. Allard, D. Goriely, S. Inakura, T. Khan, E. Kido, E. Kimura, M. Litvinova, E. Nagataki, S. Neumann-Cosel, P. von Pietralla, N. Shimizu, N. Tsoneva, N. Utsuno, Y. Adachi, S. Adsley, P. Bahini, A. Balabanski, D. Baret, B. Bekker, J. A. C. Binda, S. D. Boicu, E. Bracco, A. Brandherm, I. Brezeanu, M. Brummer, J. W. Camera, F. Crespi, F. C. L. Dalal, R. Donaldson, L. M. Fujikawa, Y. Furuno, T. Haoning, H. Higuchi, R. Honda, Y. Gavrilescu, A. Inoue, A. Isaak, J. Jivan, H. Jones, P. Jongile, S. Just, O. Kawabata, T. Khumalo, T. Kiener, J. Kleemann, J. Kobayashi, N. Koshio, Y. Kuşoğlu, A. Li, K. C. W. Malatji, K. L. Molaeng, R. E. Motoki, H. Murata, M. Netshiya, A. A. Neveling, R. Niina, R. Okamoto, S. Ota, S. Papst, O. Parizot, E. Petruse, T. Reen, M. S. Ring, P. Sakanashi, K. Sideras-Haddad, E. Siem, S. Spall, M. Suda, T. Sudo, T. Taniguchi, Y. Tatischeff, V. Utsunomiya, H. Wang, H. Werner, V. Wibowo, H. Wiedeking, M. Wieland, O. Xu, Y. Yang, Z. H. Research Center for Nuclear Physics (RCNP) Osaka University Ibaraki Japan Institute for Radiation Sciences (IRS) Osaka University Toyonaka Japan Department of Physics Osaka University Toyonaka Japan School of Physics University of the Witwatersrand Johannesburg South Africa Themba Laboratory for Accelerator Based Sciences Somerset West South Africa Extreme Light Infrastructure-Nuclear Physics (ELI-NP)/Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH) Bucharest-Măgurele Romania Laboratoire Astroparticule et Cosmologie CNRS Université Paris Cité Paris France Institut d’Astronomie et d’Astrophysique Université Libre de Bruxelles Brussels Belgium Tokyo Institute of Technology Tokyo Japan IJCLab CNRS/IN2P3 Université Paris-Saclay Orsay Cedex France RIKEN Wako Japan Department of Physics Hokkaido University Sapporo Japan Faculty of Science Japan and Nuclear Reaction Data Centre Hokkaido University Sapporo Japan Department of Physics Western Michigan University Kalamazoo USA Institut für Kernphysik Technische Universität Darmstadt Darmstadt Germany Center for Computational Sciences University of Tsukuba Tsukuba Japan Advanced Science Research Center Japan Atomic Energy Agency Tokai Japan Cyclotron and Radioisotope Center Tohoku University Sendai Japan Department of Physics and Astronomy Texas A &M University College Station USA Cyclotron Institute Texas A &M University College Station USA University of Bucharest Bucharest-Măgurele Romania Dipartimento di Fisica dell’Università degli Studi di Milano Milan Italy INFN Sezione di Milano Milan Italy Guru Jambheshwar University of Science and Technology Hisar India Department of Physics Kyoto University Kyoto Japan Politehnica University of Bucharest Bucharest Romania GSI Helmholtzzentrum für Schwerionenforschung Darmstadt Germany Department of Physics Okayama University Okayama Japan Department of Physics Faculty of Science Istanbul University Istanbul Turkey Depart

Photonuclear reactions of light nuclei below a mass of $$A=60$$ are planned to be studied experimentally and theoretically with the PANDORA (Photo-Absorption of Nuclei and Decay Observation for Reactions in Astrophysics) project. Two experimental methods, virtual photon excitation by proton scattering and real photo absorption by a high-brilliance $$\gamma $$ -ray beam produced by laser Compton scattering, will be applied to measure the photoabsorption cross sections and decay branching ratio of each decay channel as a function of the photon energy. Several nuclear models, e.g. anti-symmetrized molecular dynamics, mean-field and beyond-mean-field models, a large-scale shell model, and ab initio models, will be employed to predict the photonuclear reactions. The uncertainty in the model predictions will be evaluated based on the discrepancies between the model predictions and experimental data. The data and predictions will be implemented in the general reaction calculation code, TALYS. The results will be applied to the simulation of the photo-disintegration process of ultra-high-energy cosmic rays in inter-galactic propagation.

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Possible electron doping of geometrically perfect spin-1/2 kagome-lattice barlowite by reduced graphene oxide

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physical Review B 2021年第10期104卷 L100418-L100418页

作者： Kriti Gupta Pranay Ninawe Anil Jain Arun Dadwal M. Anas V. K. Malik S. M. Yusuf Pattayil A. Joy Nirmalya Ballav Department of Chemistry Indian Institute of Science Education and Research Pune 411008 India Solid State Physics Division Bhabha Atomic Research Centre Mumbai 400085 India Homi Bhabha National Institute Anushakti Nagar Mumbai 400094 India Physical and Materials Chemistry Division National Chemical Laboratory Pune 411008 India Department of Physics Indian Institute of Technology Roorkee 247667 India

Doping of quantum spin liquid (QSL) insulators by electron or hole leads to intriguing phase transitions to metallic and superconducting states. The barlowite family with geometrically perfect S=1/2 kagome planes and tunable interkagome coupling is an emerging platform to realize spin-ordered, valence bond crystal, QSL states. Theoretical investigations on electron doping revealed localized states in the band gap of barlowite unlike metallicity in cuprate (Nd2CuO4). We present successful anchoring of phase-pure barlowite crystallites onto reduced graphene oxide (rGO). The resulting barlowite-rGO system was found to be an electrical semiconductor with Arrhenius activation energy of 0.07 eV. Semiconducting properties of the barlowite-rGO system were further modulated with retention of structural integrity. We have attributed such a transformation of electrical transport response to plausible electron doping thereby making charge-doping experiments on barlowite and its analogs propitious.

关键词： Graphene Kagome lattice Magnetization measurements Photoemission spectroscopy Resistivity measurements Specific heat measurements

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