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Rare Metals 2022年第10期41卷 3495-3503页

作者： Xiao-Yu Li Zi-Ang Li Feng-Bo Yan Hao Zhang jia-ou wang Xin-You Ke Yong jiang Nuo-Fu Chen Ji-Kun Chen School of New Energy North China Electric Power UniversityBeijing102206China School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China Department of Mechanical and Aerospace Engineering Case Western Reserve UniversityClevelandOH44106USA

The rare-earth nickelates(RENiO_(3)) exhibit an exceptional complex electronic phase diagram and multiple electronic phase transitions that enrich promising applications in correlated electronic devices beyond conventional ***,the practical applications of RENiO_(3) are challenged by their intrinsic thermodynamic metastability in material synthesis and high material ***,developing an economical strategy to achieve the batch synthesis of RENiO_(3) is of vital *** this work,we enlarged the synthesis amount of RENiO_(3) up to 20 g per batch using chloride(KCI) assisted molten salt *** optimizing the reaction conditions,the powder of RENiO_(3) with the cubic shape and average size of ~2μm was effectively synthesized,while their phase purity exceeded 95%.In addition,the cost to synthesize RENiO_(3) was further reduced by using rare-earth extraction intermediate products as the raw materials,instead of using the pure rare-earth *** also achieved wide adjustments in the metal-to-insulator-transition temperature from160 to 420 K without significantly reducing the transition *** enlarging the synthesis amount and the reducing the cost,it paves the way to the device application of RENiO_(3).

关键词： Quantum materials Rare-earth nickelates Metastable materials Perovskite oxides

Multiple Dirac points including potential spin-orbit Dirac points in nonsymmorphic HfGe0.92Te

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Science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 155-163页

作者： Long Chen Liqin Zhou Ying Zhou Chen Liu Zhongnan Guo Ke Liao Shunye Gao Wenhui Fan Jinfeng Xu Yuxuan Guo jia'ou wang Tian Qian Hongming Weng Gang wang Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of Chemistry School of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China Songshan Lake Materials Laboratory Dongguan 523808China

The search for new materials with Dirac points has been a fascinating subject of condensed matter *** we first report the growth and band structure of HfGe_(0.92)Te single crystals featuring three different types of Dirac ***_(0.92)Te crystallizes in a nonsymmorphic tetragonal space group P4/nmm(No.129),having a square Ge-atom plane with vacancies of about 8%.Using angle-resolved photoemission spectroscopy(ARPES),the Dirac nodal line composed of conventional Dirac points vulnerable to spin-orbit coupling(SOC)is observed,accompanied by robust Dirac points protected by the nonsymmorphic symmetry against SOC and *** particular,spin-orbit Dirac points(SDPs)originating from the surface formed under significant SOC could exist based on ARPES and ***-two-dimensional(quasi-2D)characteristics are confirmed by angular-resolved ***_(0.92)Te bulk crystals can be easily exfoliated to flakes with a thickness of approximately 5 nm for the quasi-2D ***,HfGe_(0.92)Te provides a good platform to explore exotic topological phases or topological properties with three different types of Dirac points,which is a potential candidate to achieve novel 2D SDPs.

关键词： Dirac points spin-orbit coupling quasi-2D characteristics

Epitaxially grown monolayer VSe2： an air-stable magnetic two-dimensional material with low work function at edges

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Science Bulletin 2018年第7期63卷 419-425页

作者： Zhong-Liu Liu Xu Wu Yan Shao Jing Qi Yun Cao Li Huang Chen Liu jia-ou wang Qi Zheng Zhi-Li Zhu Kurash Ibrahim Ye-Liang wang Hong-Jun Gao Institute of Physics and University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China CAS Center for Excellence in Topological Quantum Computation Beijing 100049 China

Recent experimental breakthroughs open up new opportunities for magnetism in few-atomic-layer twodimensional(2 D) materials, which makes fabrication of new magnetic 2 D materials a fascinating ***, we report the growth of monolayer VSe_2 by molecular beam epitaxy(MBE) method. Electronic properties measurements by scanning tunneling spectroscopy(STS) method revealed that the asgrown monolayer VSe_2 has magnetic characteristic peaks in its electronic density of states and a lower work-function at its edges. Moreover, air exposure experiments show air-stability of the monolayer VSe_2. This high-quality monolayer VSe_2, a very air-inert 2 D material with magnetism and low edge work function, is promising for applications in developing next-generation low power-consumption, high efficiency spintronic devices and new electrocatalysts.

关键词： VSe2 Two-dimensional materials Magnetism Epitaxial growth Scanning tunneling microscopy (STM)

Syntropic spin alignment at the interface between ferromagnetic and superconducting nitrides

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National Science Review 2024年第8期11卷 167-179页

作者： Qiao Jin Qinghua Zhang He Bai Meng Yang Yonglong Ga Shengru Chen Haitao Hong Ting Cui Dongke Rong Ting Lin jia-ou wang Chen Ge Can wang Yanwei Cao Lin Gu Guozhu Song Shanmin wang Kun jiang Zhi-Gang Cheng Tao Zhu Hongxin Yang Kui-juan Jin Er-jia Guo Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Spallation Neutron Source Science Center Department of Physics & Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Ningbo Institute of Materials Technology &Engineering Chinese Academy of Sciences Institute of High Energy Physics Chinese Academy of Sciences Songshan Lake Materials Laboratory National Center for Electron Microscopy in Beijing and School of Materials Science and Engineering Tsinghua University Department of Physics Southern University of Science and Technology School of Physics Zhejiang University

The magnetic correlations at the superconductor/ferromagnet（S/F） interfaces play a crucial role in realizing dissipation-less spin-based logic and memory technologies,such as triplet-sup ercurrent spin-valves and 'π'Josephson *** we report the observation of an induced large magnetic moment at high-quality nitride S/F *** polarized neutron reflectometry and DC S QUID measurements,we quantitatively determined the magnetization profile of the S/F bilayer and confirmed that the induced magnetic moment in the adjacent superconductor only exists below ***,the direction of the induced moment in the superconductors was unexpectedly parallel to that in the ferromagnet,which contrasts with earlier findings in S/F heterostructures based on metals or ***-principles calculations verified that the unusual interfacial spin texture observed in our study was caused by the Heisenberg direct exchange coupling with constant J～4.28 meV through d-orbital overlapping and severe charge transfer across the *** work establishes an incisive experimental probe for understanding the magnetic proximity behavior at S/F interfaces and provides a prototype epitaxial 'building block' for superconducting spintronics.

关键词： magnetic proximity effects nitride interfaces polarized neutron reflectometry superconductor/ferromagnetic interfaces superconducting spintronics

Electronic states and molecular orientation of ITIC film

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Chinese Physics B 2018年第8期27卷 665-669页

作者： Ying-Ying Du De-Qu Lin Guang-Hua Chen Xin-Yuan Bail Long-Xi wang Rui Wu jia-ou wang Hai-Jie Qian Hong-Nian Lil Department of Physics Zhejiang UniversityHangzhou 310027China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

ITIC is the milestone of non-fullerene small molecule acceptors used in organic solar cells. We study the electronic states and molecular orientation of ITIC film using photoelectron spectroscopy and x-ray absorption spectroscopy. The negative integer charge transfer energy level is determined to be 4.00 ± 0.05 eV below the vacuum level, and the ionization potential is 5,75 ±0.10 eV. The molecules predominantly have the face-on orientation on inert substrates as long as the surfaces of the substrates are not too rough. These results provide the physical understanding of the high performance of ITIC-based solar ceils, which also afford implications to design more advanced photovoltaic small molecules.

关键词： electronic states molecular orientation photovoltaic small molecule photoelectron spectroscopy,XAS

Preparation and characterization of Ti-Zr-V-Cu getter films

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Radiation Detection Technology and Methods 2024年第2期8卷 1298-1305页

作者： Yuchen Yang Tao Huang Na wang jia’ou wang Saike Tian Sen Yue Haichang Duan Yongsheng Ma Yu Liu Jun Ren Xiaohua Peng Haiyi Dong Ping He Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China jiangnan University Wuxi214122China

Introduction Non-evaporable getter is now widely employed in many accelerators to mitigate the resistive-wall effect of the Ti-Zr-V getter coated vacuum chambers in the next generation *** and discussions Quaternary Ti-Zr-V-Cu getter films were deposited by direct current(DC)magnetron *** DC/high frequency impedance and activation kinetics were investigated by four-probes/waveguide methods and in situ synchrotron radiation photoelectron spectroscopy(SRPES).Conclusions Compared to Ti-Zr-V films,Ti-Zr-V-Cu films showed better conductivity,which is beneficial to eliminate the resistive-wall ***,its initial activation temperature is above 200℃,and it needs to be activated at a higher temperature to achieve the required pumping performance.

关键词： Getter NEG TiZrVCu Impedance Conductivity SRPES Pumping speed

Charge density wave states in phase-engineered monolayer VTe_(2)

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Chinese Physics B 2022年第7期31卷 71-76页

作者： Zhi-Li Zhu Zhong-Liu Liu Xu Wu Xuan-Yi Li Jin-An Shi Chen Liu Guo-jian Qian Qi Zheng Li Huang Xiao Lin jia-ou wang Hui Chen Wu Zhou jia-Tao Sun Ye-Liang wang Hong-Jun Gao Institute of Physics and University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices School of Integrated Circuits and ElectronicsBeijing Institute of TechnologyBeijing 100081China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100084China

Charge density wave(CDW)strongly affects the electronic properties of two-dimensional(2D)materials and can be tuned by phase *** 2D transitional metal dichalcogenides(TMDs),VTe_(2)was predicted to require small energy for its phase transition and shows unexpected CDW states in its ***,the CDW state of H-VTe_(2)has been barely ***,we investigate the CDW states in monolayer(ML)H-VTe_(2),induced by phase-engineering from T-phase VTe_(2).The phase transition between T-and H-VTe_(2)is revealed with x-ray photoelectron spectroscopy(XPS)and scanning transmission electron microscopy(STEM)*** H-VTe_(2),scanning tunneling microscope(STM)and low-energy electron diffraction(LEED)results show a robust 2√3×2√3CDW superlattice with a transition temperature above 450 *** findings provide a promising way for manipulating the CDWs in 2D materials and show great potential in its application of nanoelectronics.

关键词： charge density wave H-VTe_(2) phase engineering transitional metal dichalcogenides

Epitaxial fabrication of monolayer copper arsenide on Cu(111)

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Chinese Physics B 2020年第7期29卷 194-198页

作者： Shuai Zhang Yang Song Jin Mei Li Zhenyu wang Chen Liu jia-ou wang Lei Gao jian-Chen Lu Yu Yang Zhang Xiao Lin Jinbo Pan Shi Xuan Du Hong-Jun Gao Institute of Physics&University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100190China Kunming University of Science and Technology Kunming 650500China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We report the epitaxial growth of monolayer copper arsenide(CuAs)with a honeycomb lattice on Cu(111)by molecular beam epitaxy(MBE).Scanning tunneling microscopy(STM),low energy electron diffraction(LEED),x-ray photoelectron spectroscopy(XPS),and density functional theory(DFT)verify the√3×√3 superlattice of monolayer CuAs on Cu(111)***-resolved photoemission spectroscopy(ARPES)measurements together with DFT calculations demonstrate the electronic band structures of monolayer CuAs and reveal its metallic *** calculations show that charge transfer from Cu(111)substrate to monolayer CuAs lifts the Fermi level and tunes the band structure of the monolayer *** high-quality epitaxial monolayer CuAs with potential tunable band gap holds promise on the applications in nano-electronic devices.

关键词： copper arsenide(CuAs) band structure scanning tunneling microscopy(STM)

High quality PdTe_2 thin films grown by molecular beam epitaxy

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Chinese Physics B 2018年第8期27卷 72-76页

作者： En Li Rui-Zi Zhang Hang Li Chen Liu Geng Li jia-ou wang Tian Qian Hong Ding Yu-Yang Zhang Shi-Xuan Du Xiao Lin Hong-Jun Gao Institute of Physics ＆ University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

PdTe2, a member of layered transition metal dichalcogenides （TMDs）, has aroused significant research interest due to the coexistence of superconductivity and type-II Dirac fermions. It provides a promising platform to explore the inter- play between superconducting quasiparticles and Dirac fermions. Moreover, PdTe2 has also been used as a substrate for monolayer antimonene growth. Here in this paper, we report the epitaxial growth of high quality PdTe2 films on bilayer graphene/SiC（0001） by molecular beam epitaxy （MBE）. Atomically thin films are characterized by scanning tunneling microscopy （STM）, X-ray photoemission spectroscopy （XPS）, low-energy electron diffraction （LEED）, and Raman spec- troscopy. The band structure of 6-layer PdTe2 film is measured by angle-resolved photoemission spectroscopy （ARPES）. Moreover, our air exposure experiments show excellent chemical stability of epitaxial PdTe2 film. High-quality PdTe2 films provide opportunities to build antimonene/PdTe2 heterostructure in ultrahigh vacuum for future applications in electronic and optoelectronic nanodevices.

关键词： two-dimensional materials transition-metal dichalcogenides PdTe2, molecular beam epitaxy

Experimental Synthesis of Strained Monolayer Silver Arsenide on Ag(111)Substrates

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Chinese Physics Letters 2020年第6期37卷 111-114页

作者： Shuai Zhang Yang Song Hang Li Jin-Mei Li Kai Qian Chen Liu jia-ou wang Tian Qian Yu-Yang Zhang jian-Chen Lu Hong Ding Xiao Lin Jinbo Pan Shi-Xuan Du Hong-Jun Gao Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100190China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Kunming University of Science and Technology Kunming 650500China

Two-dimensional(2 D)materials are playing more and more important roles in both basic sciences and industrial *** 2 D materials,strain could tune the properties and enlarge *** the growth of 2 D materials on substrates is often accompanied by strain,the interaction between 2 D materials and substrates is worthy of careful *** we demonstrate the fabrication of strained monolayer silver arsenide(AgAs)on Ag(111)by molecular beam epitaxy,which shows one-dimensional stripe structures arising from uniaxial *** atomic geometric structure and electronic band structure are investigated by low energy electron diffraction,scanning tunneling microscopy,x-ray photoelectron spectroscopy,angle-resolved photoemission spectroscopy and first-principle *** AgAs synthesized on Ag(111)provides a platform to study the physical properties of strained 2 D materials.

关键词： materials. strained silver