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Unveiling the origin of anomalous low-frequency Raman mode in CVD-grown monolayer WS_(2)

Nano Research 2021年第11期14卷 4314-4320页

作者： Qian Xiang Xiaofei Yue Yanlong Wang Bin Du Jiajun Chen Shaoqian Zhang Gang Li Chunxiao Cong Ting Yu Qingwei Li Yuqi Jin Key Laboratory of Chemical Lasers Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China State Key Laboratory of ASIC&System School of Information Science and TechnologyFudan UniversityShanghai200433China School of Materials Science and Engineering Xi’an Polytechnic UniversityXi’an710048China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University637371SingaporeSingapore University of Chinese Academy of Sciences Beijing100049China

Substrates provide the necessary support for scientific explorations of numerous promising features and exciting potential applications in two-dimensional (2D) transition metal dichalcogenides (TMDs). To utilize substrate engineering to alter the properties of 2D TMDs and avoid introducing unwanted adverse effects, various experimental techniques, such as high-frequency Raman spectroscopy, have been used to understand the interactions between 2D TMDs and substrates. However, sample-substrate interaction in 2D TMDs is not yet fully understood due to the lack of systematic studies by techniques that are sensitive to 2D TMD-substrate interaction. This work systematically investigates the interaction between tungsten disulfide (WS_(2)) monolayers and substrates by low-frequency Raman spectroscopy, which is very sensitive to WS_(2)-substrate interaction. Strong coupling with substrates is clearly revealed in chemical vapor deposition (CVD)-grown monolayer WS_(2) by its low-wavenumber interface mode. It is demonstrated that the enhanced sample-substrate interaction leads to tensile strain on monolayer WS_(2), which is induced during the cooling process of CVD growth and could be released for monolayer WS_(2) sample after transfer or fabricated by an annealing-free method such as mechanical exfoliation. These results not only suggest the effectiveness of low-frequency Raman spectroscopy for probing sample-substrate interactions in 2D TMDs, but also provide guidance for the design of high-performance devices with the desired sample-substrate coupling strength based on 2D TMDs.

关键词： interface mode monolayer tungsten disulfide low-frequency Raman spectroscopy sample-substrate interaction strain chemical vapor deposition

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Deriving lower bounds on the efficiency of near-degenerate thermal machines via synchronization

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physical Review A 2023年第1期108卷 012205-012205页

作者： Taufiq Murtadho Juzar Thingna Sai Vinjanampathy Center for Theoretical Physics of Complex Systems Institute for Basic Science Daejeon 34126 Republic of Korea Basic Science Program Korea University of Science and Technology Daejeon 34113 Republic of Korea School of Physical and Mathematical Sciences Nanyang Technological University 637371 Singapore Department of Physics and Applied Physics University of Massachusetts Lowell Massachusetts 01854 USA Department of Physics Indian Institute of Technology Bombay Powai Mumbai 400076 India Centre of Excellence in Quantum Information Computation Science and Technology Indian Institute of Technology Bombay Powai Mumbai 400076 India Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 117543 Singapore

We study the relationship between quantum synchronization and the thermodynamic performance of a four-level near-degenerate extension of the Scovil–Schulz-DuBois thermal maser. We show how the existence of interacting coherences can potentially modify the relationship between synchronization and the coherent power output of such a maser. In particular, the cooperation and competition between interacting coherences cause the coherent heat and efficiency to be bounded by the synchronization measure in addition to the well-studied power synchronization bound. Overall, our results highlight the role of quantum synchronization in the working of a thermal machine.

关键词： Masers Quantum statistical mechanics Quantum thermodynamics Synchronization Quantum heat engines & refrigerators

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Hybrid Dirac semimetal-based photodetector with efficient low-energy photon harvesting

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Light(science & Applications) 2022年第3期11卷 107-116页

作者： Lin Wang Li Han Wanlong Guo Libo Zhang Chenyu Yao Zhiqingzi Chen Yulu Chen Cheng Guo Kaixuan Zhang Chia-Nung Kuo Chin Shan Lue Antonio Politano Huaizhong Xing Mengjie Jiang Xianbin Yu Xiaoshuang Chen Wei Lu State Key Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of Sciences500 Yu-tian RoadShanghai 200083China Department of Optoelectronic Science and Engineering Donghua UniversityShanghai 201620China College of Physics and Optoelectronic Engineering Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesNo.1Sub-Lane XiangshanXihu DistrictHangzhou 310024China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China The 50th Research Institute of China Electronics Technology Group Shanghai 200331China Research Center for Intelligent Network Zhejiang LabHangzhou 311121China Department of Physics Cheng Kung University1 Ta-Hsueh Road70101 TainanTaiwanChina INSTM and Department of Physical and Chemical Sciences University of L’Aquilavia Vetoio67100 L’Aquila(AQ)Italy CNR-IMM Istituto per la Microelettronica e Microsistemi VIII strada 5I-95121 CataniaItaly

Despite the considerable effort,fast and highly sensitive photodetection is not widely available at the low-photon-energy range(~meV)of the electromagnetic spectrum,owing to the challenging light funneling into small active areas with efficient conversion into an electrical ***,we provide an alternative strategy by efficiently integrating and manipulating at the nanoscale the optoelectronic properties of topological Dirac semimetal PtSe_(2)and its van der Waals ***,we realize strong plasmonic antenna coupling to semimetal states near the skin-depth regime(λ/10^(4)),featuring colossal photoresponse by in-plane symmetry *** observed spontaneous and polarization-sensitive photocurrent are correlated to strong coupling with the nonequilibrium states in PtSe_(2)Dirac semimetal,yielding efficient light absorption in the photon range below 1.24 meV with responsivity exceeding∼0.2 A/W and noise-equivalent power(NEP)less than~38 pW/Hz^(0.5),as well as superb ambient *** results pave the way to efficient engineering of a topological semimetal for high-speed and low-energy photon harvesting in areas such as biomedical imaging,remote sensing or security applications.

关键词： stability Dirac topological

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Anticoagulation Colloidal Microrobots Based on Heparin-Mimicking Polymers

SSRN

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SSRN 2025年

作者： Wang, Huanhuan Wang, Huaguang Liu, Xiaoli Zhang, Zexin College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou215123 China Institute for Advanced Study Center for Soft Condensed Matter Physics and Interdisciplinary Research School of Physical Science and Technology Soochow University Suzhou215006 China

Coagulation within blood vessels is a major cause of cardiovascular disease and global mortality, highlighting the urgent need for effective anticoagulant strategies. In this study, we introduce a dynamic and highly efficient anticoagulant platform, achieved through the fabrication of a novel colloidal microrobot with unique functional properties. The microrobot is a Janus colloidal sphere with one hemisphere coated in heparin-mimicking polymers and the other in gold. This structure endows the microrobot with self-propulsion capabilities, powered by biocompatible near-infrared (NIR) irradiation, without the need for chemical fuel. The heparin-mimicking polymers not only prevent blood clotting but also promote endothelial cell growth while inhibiting the proliferation of smooth muscle cells. Additionally, the self-propulsion feature allows the microrobot to travel long distances within blood vessels and precisely target sites for anticoagulation. Our work validates an approach for the production of biofunctionalized microrobots, which introduces a novel avenue for anticoagulation application through the development of innovative biofunctionalized colloidal devices. © 2025, The Authors. All rights reserved.

关键词： Coagulation

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Precise fabrication of single-atom alloy co-catalyst with optimal charge state for enhanced photocatalysis

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National science Review 2021年第1期8卷 81-88页

作者： Yating Pan Yunyang Qian Xusheng Zheng Sheng-Qi Chu Yijun Yang Chunmei Ding Xi Wang Shu-Hong Yu Hai-Long Jiang Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Soft Matter ChemistryDepartment of Chemistry University of Science and Technology of China National Synchrotron Radiation Laboratory (NSRL) University of Science and Technology of China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of Sciences Key Laboratory of Luminescence and Optical Information Ministry of EducationDepartment of Physics School of Science Beijing Jiaotong University Dalian National Laboratory for Clean Energy State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences

While the surface charge state of co-catalysts plays a critical role for boosting photocatalysis, studies on surface charge regulation via their precise structure control remain extremely rare. Herein, metal-organic framework（MOF） stabilized bimetallic Pd@Pt nanoparticles, which feature adjustable Pt coordination environment and a controlled structure from core-shell to single-atom alloy（SAA）, have been ***, apart from the formation of a Mott-Schottky junction in a conventional way, we elucidate that Pt surface charge regulation can be alternatively achieved by changing its coordination environment and the structure of the Pd@Pt co-catalyst, where the charge between Pd and Pt is redistributed. As a result, the optimized Pd10@Pt1/MOF composite, which involves an unprecedented SAA co-catalyst, exhibits exceptionally high photocatalytic hydrogen production activity, far surpassing its corresponding counterparts.

关键词： metal-organic framework (MOF) single-atom alloy (SAA) co-catalyst surface charge state photocatalysis

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Essentially degenerate hidden nodal lines in two-dimensional magnetic layer groups

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physical Review B 2024年第23期110卷 235163-235163页

作者： Xiao-Ping Li Chaoxi Cui Lei Wang Weikang Wu Zeying Zhang Zhi-Ming Yu Yugui Yao School of Physical Science and Technology Inner Mongolia University Hohhot 010021 China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 China

According to the theory of group representations, the types of band degeneracy can be divided into accidental degeneracy and essential degeneracy. The essentially degenerate nodal lines (NLs) are typically resided on the high-symmetry lines of the Brillouin zone. Here, we propose a type of NL in two dimensions that is essentially degenerate but is hidden within the high-symmetry planes, making it less observable, dubbed a hidden-essential nodal line (HENL). The existence of HENL is guaranteed as long as the system hosts a horizontal glide-mirror symmetry, hence such NLs can be widely found in both nonmagnetic and magnetic systems. We perform an exhaustive search over all 528 magnetic layer groups (MLGs) for HENL that can be enforced by glide-mirror symmetry with both spinless and spinfull systems. We find that 122 candidate MLGs host spinless HENL, while 63 candidate MLGs demonstrate spinful HENL. In addition, we reveal that horizontal mirror and time-reversal symmetry in type-II and type-IV MLGs with spin-orbital coupling can enforce HENL formed. The 15 corresponding candidate MLGs have also been presented. Furthermore, we derive a few typical lattice models to characterize the existence for the HENL. For specific electronic fillings in real materials, namely 4N+2 in spinless systems (and 2N+1 in spinful systems), the presence of the HENLs in candidate MLGs is required regardless of the details of the systems. Using ab initio calculations, we further identify possible material candidates that realize spinless and spinful HENL. Moreover, spinful HENLs exhibit a persistent spin texture with the characteristic of momentum-independent spin configuration. Our findings uncover a type of topological semimetal state and offer an ideal platform to study the related physics of HENLs.

关键词： Mirrors

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Plasmonic photocatalysis:Mechanism,applications and perspectives

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Chinese Journal of Structural Chemistry 2023年第9期42卷 57-70页

作者： Tian Wang Hong-Jia Wang Jia-Sheng Lin Jing-Liang Yang Fan-Li Zhang Xiu-Mei Lin Yue-Jiao Zhang Shangzhong Jin Jian-Feng Li Institute of Optical and Electronic Technology China Jiliang UniversityHangzhou310018China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringCollege of EnergyIChEMXiamen UniversityXiamen361005China College of Physics Guizhou UniversityGuizhou550000China Department of Chemistry and Environment Science Fujian Province University Key Laboratory of Analytical ScienceMinnan Normal UniversityZhangzhou363000China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen361005China

The process of photocatalysis,regarded as a promising approach for tackling the energy crisis and environmental pollution issues,is crucial for turning solar light into chemical ***,the solar-chemical conversion efficiency of typical semiconductor catalysts is still too low,so it is vital to figure out how to boost photocatalytic performance of *** visible light illumination,the local surface plasmon resonance(LSPR)induced by coinage metal would enhance the local electric field and improve photocatalytic performance of semiconductors,especially in the visible ***,its attachment to semiconductors has been regarded as an efficient strategy to improve photocatalytic *** paper reviews the latest research progress of plasmonic photocatalysis from theory to *** from the excitation and relaxation of plasmons,four main mechanisms of plasmon-enhanced semiconductor photocatalysis are introduced,including enhanced light absorption and scattering,local electromagnetic field enhancement,improved hot carriers(HCs)injection and enhanced thermal ***,the current mainstream plasmonic photocatalysts,such as monometallic,bimetallic and non-noble metal-based plasmonic catalysts,are ***,the applications of plasmonic photocatalysts in H_(2) production,CO_(2) reduction,and antibacterial are further summarized.

关键词： Plasmonic Nanostructures Photocatalyst Electromagnetic field LSPR

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Complete list of valley linear Weyl point phonons in two dimensions

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physical Review B 2023年第20期107卷 205406-205406页

作者： Mingmin Zhong Haibo Liu Jianhua Wang Chengwu Xie Hongkuan Yuan Zeying Zhang Guangqian Ding Xiaotian Wang Gang Zhang School of Physical Science and Technology Southwest University Chongqing 400715 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 China School of Science Chongqing University of Posts and Telecommunications Chongqing 400065 China Institute for Superconducting and Electronic Materials (ISEM) University of Wollongong Wollongong 2500 Australia Institute of High Performance Computing Agency for Science Technology and Research (A*STAR) 138632 Singapore

The discovery of topological quantum states in two-dimensional (2D) systems is one of the most promising advancements in condensed matter physics. Linear Weyl point (LWP) phonons have been theoretically investigated in some 2D materials. Especially, Jin, Wang, and Xu [Nano Lett. 18, 7755 (2018)] proposed in 2018 that the candidates with threefold rotational symmetry at the corners of the hexagonal Brillouin zone can host LWP phonons with a quantized valley Berry phase. Note that all the candidates with hexagonal lattices may not host LWP phonons at K (K′) high-symmetry points (HSPs). Hence a strategy for narrowing the search range for LWP phonons in 2D is highly required. This work provides an exhaustive list of valley LWP phonons at HSPs in 2D by searching the entire 80 layer groups (LGs). We found that the valley LWP phonons can be obtained at HSPs in 11 of the 80 LGs. Guided by the symmetry analysis, we also contributed to realizing the ideal 2D material with valley LWP phonons. We identified the existence of the valley LWP phonons in 11 2D material candidates with 11 LGs. This work offers a method to search for valley LWPs in 2D phononic systems and proposes 2D material candidates to obtain the valley LWP phonons.

关键词： Phonons 2-dimensional systems Topological materials Density functional theory

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Phase transferring luminescent gold nanoclusters via single-stranded DNA

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science China Chemistry 2022年第6期65卷 1212-1220页

作者： Yu Li Hui Lu Zhibei Qu Mingqiang Li Haoran Zheng Peilin Gu Jiye Shi Jiang Li Qian Li Lihua Wang Jing Chen Chunhai Fan Jianlei Shen Division of Physical Biology CAS Key Laboratory of Interfacial Physics and TechnologyShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai201800China University of Chinese Academy of Sciences Beijing100049China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and National Center for Translational MedicineShanghai Jiao Tong UniversityShanghai200240China Shanghai Synchrotron Radiation Facility Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghai201210China Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai200127China

Atomically precise gold nanoclusters(Au NCs) are an emerging class of quantum-sized nanomaterials with discrete electronic energy levels, which has led to a range of attractive electronic and optical applications. Nevertheless, the lack of general methods to transfer Au NCs protected with hydrophobic ligands to an aqueous solution hampers their use in physiological settings. Here,we developed a single-stranded DNA-based approach that could transfer ~90% hydrophobic Au NCs into an aqueous *** experimentally and theoretically established that multivalent electrostatic and hydrophobic interactions between DNA strands and the hydrophobic ligand layer on Au NCs resulted in monodispersed DNA-coated Au NCs with high physical integrity in an aqueous solution. The fluorescence quantum yield of Au NCs was increased by ~13 fold, and surface-constrained DNA retained the specific recognition ability for biosensing. We further demonstrated the versatility of this phase-transfer approach, which thus holds great potential to advance biological and medical applications of Au NCs.

关键词： gold nanoclusters DNA monodispersed phase transfer biological application

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Photonic axion insulator

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science (New York, N.Y.) 2025年第6730期387卷 162-166页

作者： Liu, Gui-Geng Mandal, Subhaskar Xi, Xiang Wang, Qiang Devescovi, Chiara Morales-Pérez, Antonio Wang, Ziyao Yang, Linyun Banerjee, Rimi Long, Yang Meng, Yan Zhou, Peiheng Gao, Zhen Chong, Yidong García-Etxarri, Aitzol Vergniory, Maia G. Zhang, Baile Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore Research Center for Industries of the Future Department of Electronic and Information Engineering School of Engineering Westlake University Hangzhou China School of Electrical Engineering and Intelligentization Dongguan University of Technology Dongguan China National Laboratory of Solid State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing China Donostia International Physics Center Donostia-San Sebastian Spain Institute for Theoretical Physics ETH Zurich Zurich Switzerland Material and Applied Physics Department University of the Basque Country (UPV/EHU) Donostia-San Sebastián Spain Department of Electronic and Electrical Engineering Southern University of Science and Technology Shenzhen China National Engineering Research Center of Electromagnetic Radiation Control Materials Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of China Chengdu China State Key Laboratory of Optical Fiber and Cable Manufacture Technology Department of Electronic and Electrical Engineering Guangdong Key Laboratory of Integrated Optoelectronics Intellisense Southern University of Science and Technology Shenzhen China Centre for Disruptive Photonic Technologies Photonics Institute Nanyang Technological University Singapore IKERBASQUE Basque Foundation for Science Bilbao Spain Max Planck Institute for Chemical Physics of Solids Dresden Germany Département de Physique et Institut Quantique Université de Sherbrooke Sherbrooke Canada

Axions, hypothetical elementary particles that remain undetectable in nature, can arise as quasiparticles in three-dimensional crystals known as axion insulators. Previous implementations of axion insulators have largely been limited to two-dimensional systems, leaving their topological properties in three dimensions unexplored in experiment. Here, we realize an axion insulator in a three-dimensional photonic crystal and probe its topological properties. Demonstrated features include half-quantized Chern numbers on each surface that resembles a fractional Chern insulator, unidirectional chiral hinge states forming topological transport in three dimensions, and arithmetic operations between fractional and integer Chern numbers. Our work experimentally establishes the axion insulator as a three-dimensional topological phase of matter and enables chiral states to form complex, unidirectional three-dimensional networks through braiding.

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