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Giant Valley Coherence at Room Temperature in 3R WS_(2) with Broken Inversion Symmetry

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Research 2019年第1期2019卷 466-473页

作者： Luojun Du Jian Tang Jing Liang mengzhou liao Zhiyan Jia Qinghua Zhang Yanchong Zhao Rong Yang Dongxia Shi Lin Gu Jianyong Xiang Kaihui Liu Zhipei Sun Guangyu Zhang Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Department of Electronics and Nanoengineering Aalto UniversityTietotie 3FI-02150Finland State Key Laboratory for Mesoscopic Physics Collaborative InnovationCenter of Quantum MatterSchool of PhysicsPeking UniversityBeijingChina State Key Laboratory for Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China School of Physical Sciences University of Chinese Academy of ScienceBeijing 100190China Beijing Key Laboratory for Nanomaterials and Nanodevices Beijing 100190China QTF Centre of Excellence Department of Applied PhysicsAalto UniversityFI-00076 AaltoFinland Songshan-Lake Materials Laboratory Dongguan523808 Guangdong ProvinceChina

Breaking the space-time symmetries in materials can markedly influence their electronic and optical *** 3R-stacked transition metal dichalcogenides,the explicitly broken inversion symmetry enables valley-contrasting Berry curvature and quantization of electronic angular momentum,providing an unprecedented platform for ***,we study the valley coherence of 3R WS_(2) large single-crystal with thicknesses ranging from monolayer to octalayer at room *** measurements demonstrate that both A and B excitons possess robust and thickness-independent valley *** valley coherence of direct A(B)excitons can reach 0.742(0.653)with excitation conditions on resonance with *** giant and thickness-independent valley coherence of large single-crystal 3R WS_(2) at room temperature would provide a firm foundation for quantum manipulation of the valley degree of freedom and practical application of valleytronics.

关键词： properties Inversion curvature

Pressure-mediated contact quality improvement between monolayer MoS_2 and graphite

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Chinese Physics B 2019年第1期28卷 178-182页

作者：廖梦舟杜罗军张婷婷谷林姚裕贵杨蓉时东霞张广宇 CAS Key Laboratory of Nanoscale Physics and Devices Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Department of Electronics and Nanoengineering Aalto University Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelecentronic Systems School of PhysicsBeijing Institute of Technology Beijing Key Laboratory for Nanomaterials and Nanodevices Collaborative Innovation Center of Quantum Matter

Two-dimensional(2D) materials and their heterostructures have attracted a lot of attention due to their unique electronic and optical properties. MoS_2 as the most typical 2D semiconductors has great application potential in thin film transistors, photodetector, hydrogen evolution reaction, memory device, etc. However, the performance of MoS_2 devices is limited by the contact resistance and the improvement of its contact quality is important. In this work, we report the experimental investigation of pressure-enhanced contact quality between monolayer MoS_2 and graphite by conductive atom force microscope(C-AFM). It was found that at high pressure, the contact quality between graphite and MoS_2 is significantly improved. This pressure-mediated contact quality improvement between MoS_2 and graphite comes from the enhanced charge transfer between MoS_2 and graphite when MoS_2 is stretched. Our results provide a new way to enhance the contact quality between MoS_2 and graphite for further applications.

关键词： MoS2/graphite heterojunction C-AFM pressure contact quality

论我国可撤销婚姻和无效婚姻制度的完善——以特殊群体婚姻效力为分析对象

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辽宁公安司法管理干部学院学报 2020年第3期 99-104页

作者：廖梦舟福建师范大学福建福州350108

随着社会的发展和人们婚姻家庭观念的转变,我国现行《婚姻法》中关于可撤销婚姻和无效婚姻制度的规定呈现出一定的滞后性。二者的范围、界限以及宣告程序等均不能很好地适应现实社会中出现的新情况,不但难以保护婚姻当事人的合法权益,... 详细信息

随着社会的发展和人们婚姻家庭观念的转变,我国现行《婚姻法》中关于可撤销婚姻和无效婚姻制度的规定呈现出一定的滞后性。二者的范围、界限以及宣告程序等均不能很好地适应现实社会中出现的新情况,不但难以保护婚姻当事人的合法权益,还损害了我国法律的公正性。因此,适当扩大可撤销婚姻和无效婚姻的范围,厘清二者之间的界限,并将一些特殊群体的婚姻效力问题纳入立法考量的范围,构建更加合理的可撤销婚姻和无效婚姻制度体系,是推动我国婚姻家庭法治建设、维护公民合法权益的必经之路。

关键词：可撤销婚姻无效婚姻婚姻效力

Precisely controlling the twist angle of epitaxial MoS_(2)/graphene heterostructure by AFM tip manipulation

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Chinese Physics B 2022年第8期31卷 173-177页

作者：袁嘉浩廖梦舟黄智恒田金朋褚衍邦杜罗军杨威时东霞杨蓉张广宇 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China College of Semiconductors(College of Integrated Circuits Hunan UniversityChangsha 410082China Songshan Lake Materials Laboratory Dongguan 523808China Department of Control Engineering Faculty of Electrical EngineeringCzech Technical University in PragueCzech Republic

Two-dimensional(2D)moirématerials have attracted a lot of attention and opened a new research frontier of twistronics due to their novel physical *** great progress has been achieved,the inability to precisely and reproducibly manipulate the twist angle hinders the further development of ***,we demonstrated an atomic force microscope(AFM)tip manipulation method to control the interlayer twist angle of epitaxial MoS_(2)/graphene heterostructure with an ultra-high accuracy better than 0.1°.Furthermore,conductive AFM and spectroscopic characterizations were conducted to show the effects of the twist angle on moirépattern wavelength,phonons and *** work provides a technique to precisely control the twist angle of 2D moirématerials,enabling the possibility to establish the phase diagrams of moiréphysics with twist angle.

关键词： AFM tip manipulation MoS_(2)/graphene heterostructure twist angle moirésuperlattice

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辽藁本药材与饮片指纹图谱对比研究

亚太传统医药 2021年第12期17卷 53-58页

作者：瞿昊宇谢梦洲陈光宇何群湖南省药食同源功能性食品工程技术研究中心湖南长沙410208 中医诊断学湖南省重点实验室湖南长沙410208 中医心肺病证辨证与药膳食疗重点研究室湖南长沙410208 湖南中医药大学湖南长沙410208

目的:建立辽藁本药材和饮片的HPLC指纹图谱,从而考察辽藁本炮制前后的质量传递信息,为辽藁本药材及饮片质量控制及质量标准的建立提供依据。方法:测定15批辽藁本药材和饮片的指纹图谱,并用中药色谱指纹图谱相似度评价系统2012版对两者... 详细信息

目的:建立辽藁本药材和饮片的HPLC指纹图谱,从而考察辽藁本炮制前后的质量传递信息,为辽藁本药材及饮片质量控制及质量标准的建立提供依据。方法:测定15批辽藁本药材和饮片的指纹图谱,并用中药色谱指纹图谱相似度评价系统2012版对两者相似度进行配对t检验比较分析。在选定的色谱条件下,确定6个共有色谱峰构成15批辽藁本药材与饮片指纹图谱的特征峰,辽藁本炮制前后指纹图谱基本一致,对15批辽藁本药材和饮片指纹图谱相似度进行配对t检验,得配对样本相关系数(γ=0.7696),其均值差异检验(t=0.2394,d;=14,P=0.8143)。结果:辽藁本药材和饮片指纹图谱大体一致,辽藁本炮制前后其化学成分变化的差异无统计学意义(P>0.05)。辽藁本药材和饮片指纹图谱大体一致,辽藁本炮制后未改变辽藁本药材的化学成分,保留辽藁本原药材的质量属性。结论:该研究可为辽藁本产地加工炮制、炮制前后质量属性的变化及辽藁本饮片质量控制提供参考。

关键词：辽藁本阿魏酸指纹图谱 HPLC 质量属性中药色谱指纹图谱相似度评价系统

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光催化乌尔曼型偶联反应研究进展

化学研究 2021年第4期32卷 318-324页

作者：史作冬徐泽杨凯月路广印廖力波徐浩河南大学化学化工学院河南开封475004 河南豫珠恒力生物科技有限责任公司河南孟州450008

乌尔曼反应常用于卤代芳烃与亲核试剂的偶联,多数反应需要在高温加热条件下进行,且常需加入配体与铜催化剂联用。光催化乌尔曼反应利用清洁、可再生的光能,反应条件更加简单、温和、高效,具有广阔的应用前景。本文着重介绍了近年来光催... 详细信息

乌尔曼反应常用于卤代芳烃与亲核试剂的偶联,多数反应需要在高温加热条件下进行,且常需加入配体与铜催化剂联用。光催化乌尔曼反应利用清洁、可再生的光能,反应条件更加简单、温和、高效,具有广阔的应用前景。本文着重介绍了近年来光催化乌尔曼偶联的研究进展。

关键词：乌尔曼光催化单电子转移双电子转移