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raman scattering investigation of twisted WS_(2)/MoS_(2) heterostructures: interlayer mechanical coupling versus charge transfer

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Nano Research 2021年第7期14卷 2215-2223页

作者： Lishu Wu Chunxiao Cong Jingzhi Shang Weihuang Yang Yu Chen Jiadong Zhou Wei Ai Yanlong Wang Shun Feng Hongbo Zhang Zheng Liu Ting Yu Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore School of Information Science and Technology Fudan UniversityShanghai 200433China Shaanxi Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an 710129China Engineering Research Center of Smart Microsensors and Microsystems Ministry of EducationCollege of Electronics and InformationHangzhou Dianzi UniversityHangzhou 310018China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Key Laboratory of Chemical Lasers Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Twisted van der Waals homo-and hetero-structures have aroused great attentions due to their unique physical properties,providing a new platform to explore the novel two-dimensional(2D)condensed matter *** robust dependence of phonon vibrations and electronic band structures on the twist angle has been intensively observed in transition metal dichalcogenide(TMD)***,the effects of twist angle on the lattice vibrational properties in the TMD heterostructures have not caused enough ***,we report the distinct evolutions of raman scattering and the underlying interlayer interactions in the twisted WS_(2)/MoS_(2) *** shifts and linewidths of E_(2g)(Γ)and A_(1g)(Γ)phonon modes are found to be twist angle *** particular,analogous to that of the twisted TMD homostructures,the frequency separations between E_(2g)(Γ)and A_(1g)(Γ)modes of MoS_(2) and WS_(2) in the twisted heterostructures varying with twist angle correlate with the interlayer mechanical coupling,essentially originating from the spacing-related repulsion between sulfur ***,the opposite shift behaviors and broadening of A_(1g)(Γ)modes caused by charge transfer are also observed in the twisted *** calculated interlayer distances and band alignment of twisted WS_(2)/MoS_(2) through density functional theory further evidence our interpretations on the roles of the interlayer mechanical coupling and charge transfer in variations of raman *** understanding and controlling of interlayer interaction through the stacking orientation are significant for future optoelectronic device design based on the newly emerged 2D heterostructures.

关键词： van der Waals heterostructures interlayer coupling raman scattering twist angle charge transfer

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raman scattering and t-Phase Lattice Vibration of 3% (mole fraction) Y_2O_3-ZrO_2

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Journal of Materials Science & Technology 2004年第5期20卷 485-489页

作者： Xinglun TANG and Xinhua ZHENGSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China Sch. of Mat. Sci. and Eng. Beijing Inst. of Technol. Beijing 100081 China

The raman spectra of 3% (mole fraction) Y2O3-ZrO2 (3Y) are obtained at different temperature from 77 K to 853 K. The results show that 260 cm-1 Eg and 460 cm-1 Eg modes on the spectra shift toward lower wave number with the increase of temperature; meanwhile, the continuity of the Half Width at Half Maximum (HWHM) and wave number (frequency) of raman bands are broken and t-phase only partially transforms to m-phase at 523 K. Based on the experimental results, this paper discusses the t-phase lattice vibration of 3Y and presents the images of vibration displacement of six raman-active modes for t-phase of ZrO2. The analysis indicates that there are diversities existing in the displacement of the atomic vibration of raman-active modes because of their different symmetries at various temperature, which leads to the different change tendencies of raman bands. Furthermore, the abrupt changes of some raman-active modes indicating the atomic displacement are assumed to be the condensations of phonon modes in the t→m phase transition.

关键词： raman scattering Zirconia Phase transition Condensation of phonon

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raman scattering study of two-dimensional magnetic van der Waals compound VI3

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Chinese Physics B 2020年第5期29卷 420-423页

作者： Yi-Meng Wang Shang-Jie Tian Cheng-He Li Feng Jin Jian-Ting Ji He-Chang Lei Qing-Ming Zhang Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China

The layered magnetic van der Waals materials have generated tremendous interest due to their potential applications and importance in fundamental *** x-ray diffraction(XRD)studies on the magnetic van der Waals compound VI3,revealed a structural transition above the magnetic transition but output controversial analysis on *** this paper we carried out polarized raman scattering measurements on VI3 from 10 K to 300 K,with focus on the two Ag phonon modes at^71.1 cm^-1 and 128.4 *** careful symmetry analysis based on the angle-dependent spectra demonstrates that the crystal symmetry can be well described by C2h rather than D3d both above and below structural phase *** further performed temperature-dependent raman experiments to study the magnetism in *** asymmetry and anomalous linewidth drop of two Ag phonon modes at low temperatures,point to a significant spin-phonon *** is also supported by the softening of 71.1-cm^-1 mode above the magnetic *** study provides the fundamental information on lattice dynamics and clarifies the symmetry in *** spin-phonon coupling existing in a wide temperature range revealed here may be meaningful in applications.

关键词： raman scattering two-dimensional magnetic van der Waals materials lattice dynamics magnetism

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raman scattering studies on the collapsed phase of CaCo_2As_2

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Chinese Physics B 2016年第6期25卷 533-536页

作者：籍建葶张安民杨润田勇金峰邱祥冈张清明 Department of Physics Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-nano DevicesRenmin University of China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences

In this work,raman scattering measurements have been performed on the collapsed phase CaCo2As2 *** least 8 raman modes were observed at room temperature though CaCo2As2 is structurally similar to other 122 compounds like *** raman modes are assigned to the intrinsic A1gand B1gof this material system *** other ones are considered to originate from the local vibrations relevant to cobalt *** polarized measurements allow us to clearly resolve the four-fold symmetry of the B1gmode,which put strong constraints on possible point group symmetries of the system with Co *** temperature-dependent measurements demonstrate that the anomalies in both frequency and width of the B1gmode occur around Neel temperature *** anomalies are considered to be related to the gap opening near the magnetic *** study may shed light on the structural and magnetic changes and their correlations with superconductivity in 122 systems.

关键词： iron-based superconductivity raman scattering collapsed phase

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raman scattering from highly-stressed anvil diamond

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Chinese Physics B 2021年第1期30卷 407-411页

作者： Shan Liu Qiqi Tang Binbin Wu Feng Zhang Jingyi Liu Chunmei Fan Li Lei Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China Key Laboratory of High Energy Density Physics and Technology(Ministry of Education) Sichuan UniversityChengdu 610065China

The high-frequency edge of the first-order raman mode of diamond reflects the stress state at the culet of anvil, and is often used for the pressure calibration in diamond anvil cell(DAC) experiments. Here we point out that the high-frequency edge of the diamond raman phonon corresponds to the Brillouin zone(BZ) center Γ point as a function of pressure. The diamond raman pressure gauge relies on the stability of crystal lattice of diamond under high stress. Upon the diamond anvil occurs failure under the uniaxial stress(197 GPa), the loss of intensity of the first-order raman phonon and a stressdependent broad raman band centered at 600 cm^(-1) are observed, which is associated with a strain-induced local mode corresponding to the BZ edge phonon of the L1 transverse acoustic phonon branch.

关键词： diamond anvil cell raman scattering pressure calibration Brillouin zone

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raman scattering study of phase transition in Lu_2O_3–Ta_2O_5

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Chinese Physics B 2015年第9期24卷 553-556页

作者：王小飞邢雪张庆礼尤静林伍俊张德明孙彧孙敦陆殷绍唐 The Key Laboratory of Photonic Devices and Materials Anhui Institute of Optics and Fine MechanicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Shanghai University Shanghai Key Laboratory of Modern Metallurgy & Materials Processing

The lutetium tantalate compounds obtained from Lu2O3–Ta2O5 with a molar ratio of 0.515 ： 0.485 were studied by raman scattering and x-ray diffraction. The results of the room temperature raman scattering indicate that the sample has a phase transition between 1830℃ and 1872℃, the polycrystalline is a mixture of M-LuTaO4 and Lu3TaO7（F m3m）when it is prepared at 1830℃, and a mixture of M-LuTaO4（B112/b） and Lu3 Ta O7（Fm3^-m） when it is prepared at above 1872℃. The sample melts at a temperature of 2050℃. The phase transition of the sample prepared at 2050℃ was also investigated by the high-temperature raman spectra, and the result indicates that no phase transition occurs between room temperature and 1400℃, which is consistent with the results from the x-ray diffraction.

关键词： LuTaO4 phase transition raman scattering x-ray diffraction

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raman scattering Modification Induced by Structural Change in Alumina Polymorphs

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Chinese Physics Letters 2015年第12期32卷 105-108页

作者：张建李海涛郭俊宏胡芳仁 School of Physics Beijing Institute of Technology Beijing 100081 Department of Physics Chengde Teacher's College for Nationalities Chengde 067000 School of Optoelectronic Engineering and Griienberg Research Centre Nanjing University of Posts and Telecommunications Nanjing 210023

The calculated raman spectra disclose that alumina polymorphs of nordstrandite, gibbsite, diaspore, boehmite, bayerite and α-Al2O3 display different phonon behaviors, which can be attributed to their internal crystal structure changes. The strongest raman peaks of nordstrandite, gibbsite, diaspore, boehmite, bayerite and α-Al2O3 are located at 214.2cm-1, 3314.4cm-1, 2298.6cm-1, 747.7cm-1, 3484.6cm-1 and 529.2cm-1, respectively. The characterizations in raman spectra of those polymorphs are obviously different, which can be used in fingerprints to identify the alumina polymorphs structure.

关键词： Aluminum oxide -- Spectra raman scattering Boehmite Gibbsite Crystal structure

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raman scattering studies on PZT thin films for trigonal-tetragonal phase transition

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Journal of Semiconductors 2009年第8期30卷 28-30页

作者：梁庭李珺泓杜文龙薛晨阳张文栋 Key Laboratory of Instrumentation Science & Dynamic Measurement of the Chinese Ministry of Education North University of China

PZT thin films were successfully prepared through sol-gel. The annealing temperature was confirmed through DTA analyzing. The trigonal and tetragonal phase transition was analyzed through raman scattering. The intensity of the A1（2TO） mode and the A1（3TO）T mode were enhanced with the increase of the annealing temperature. So, the conclusions were obtained that the trigonal phase turned into a tetragonal phase as temperature increased.

关键词： PZT raman scattering phase transition

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raman scattering in In/InOx core-shell structured nanoparticles

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Chinese Physics B 2014年第8期23卷 117-120页

作者： Wang Meng Tian Ye Zhang Jian-Ming Guo Chuan-Fei Zhang Xin-Zheng Liu Qian The MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Applied Physics School and School of Physics Nankai University Tianjin 300457 China National Center for Nanoscience and Technology Belting 100190 China University of the Chinese Academy of Sciences Beijing 100190 China Department of Physics and TcSUH University of Houston Houston TX 77204 USA

The properties of raman phonons are very important due to the fact that they can availably reflect some important physical information. An abnormal raman peak is observed at about 558 cm-1 in In film composed of In/InOx core-shell structured nanoparticles, and the phonon mode stays very stable when the temperature changes. Our results indicate that this raman scattering is attributed to the existence of incomplete indium oxide in the oxide shell.

关键词： raman scattering core-shell structure indium nanoparticles

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Detection of invisible phonon modes in individual defect-free carbon nanotubes by gradient-field raman scattering

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Chinese Physics B 2017年第7期26卷 474-479页

作者：杨丰纪英露张霄范庆霞张楠谷孝刚肖卓建张强王艳春吴晓春李俊杰周维亚 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing Key Laboratory for Advanced Functional Materials and Structure Research University of Chinese Academy of Sciences National Center for Nanoscience and Technology

We provide an effective method to investigate the field gradient effect in nanoconfined plasmon-matter *** ultralong SWNTs without defects were grown on marked substrates, followed by assembling gold nanoparticle clusters around individual nanotubes. The raman scattering behavior of a nanotube placed in an atomic scale nanogap between adjacent nanoparticles was studied. In addition to the expected plasmon-induced raman enhancement up to 103,the defect-free D-mode of an individual SWNT induced by gradient field is found for the first time. When the light is confined at atomic scale, gradient field raman scattering becomes significant and dipole-forbidden phonon modes can be activated by quadrupole raman tensor variation, indicating breakdown of the raman selection rules.

关键词： carbon nanotube raman scattering electromagnetic field gradient selection rule

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